Logo: to the web site of Uppsala University

uu.sePublikasjoner fra Uppsala universitet
Endre søk
Begrens søket
6789 401 - 431 of 431
RefereraExporteraLink til resultatlisten
Permanent link
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Treff pr side
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sortering
  • Standard (Relevans)
  • Forfatter A-Ø
  • Forfatter Ø-A
  • Tittel A-Ø
  • Tittel Ø-A
  • Type publikasjon A-Ø
  • Type publikasjon Ø-A
  • Eldste først
  • Nyeste først
  • Skapad (Eldste først)
  • Skapad (Nyeste først)
  • Senast uppdaterad (Eldste først)
  • Senast uppdaterad (Nyeste først)
  • Disputationsdatum (tidligste først)
  • Disputationsdatum (siste først)
  • Standard (Relevans)
  • Forfatter A-Ø
  • Forfatter Ø-A
  • Tittel A-Ø
  • Tittel Ø-A
  • Type publikasjon A-Ø
  • Type publikasjon Ø-A
  • Eldste først
  • Nyeste først
  • Skapad (Eldste først)
  • Skapad (Nyeste først)
  • Senast uppdaterad (Eldste først)
  • Senast uppdaterad (Nyeste først)
  • Disputationsdatum (tidligste først)
  • Disputationsdatum (siste først)
Merk
Maxantalet träffar du kan exportera från sökgränssnittet är 250. Vid större uttag använd dig av utsökningar.
  • 401.
    Wachtmeister, Henrik
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Naturresurser och hållbar utveckling.
    Lund, Linnea
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper.
    Aleklett, Kjell
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Naturresurser och hållbar utveckling.
    Höök, Mikael
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Naturresurser och hållbar utveckling.
    Production Decline Curves of Tight Oil Wells in Eagle Ford Shale2017Inngår i: Natural Resources Research, ISSN 1520-7439, E-ISSN 1573-8981, Vol. 26, nr 3, s. 365-377Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This study derives typical production curves of tight oil wells based on monthly production data from multiple horizontal Eagle Ford shale oil wells. Well properties initial production (IP) rate and production decline rate were documented, and estimated ultimate recovery (EUR) was calculated using two empirical production decline curve models, the hyperbolic and the stretched exponential function. Individual well productivity, which can be described by IP level, production decline curvature and well lifetime, varies significantly. The average monthly IP was found to be around 500 bbl/day, which yields an EUR in the range of 150-290 kbbl depending on used curve, assumed well lifetime or production cutoff level. More detailed analyses on EUR can be made once longer time series are available. For more realistic modeling of multiple wells a probabilistic approach might be favorable to account for variety in well productivity. For less detailed modeling, for example conceptual regional bottom-up production modeling, the hyperbolic function with deterministic parameters might be preferred because of ease of use, for example with the average parameter values IP = 500 bbl/day, D = 0.3 and b = 1 resulting in an EUR of 250 kbbl with a 30-year well lifetime, however, with the recognition that this extrapolation is uncertain.

    Fulltekst (pdf)
    fulltext
  • 402.
    Walan, Petter
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper.
    Davidsson, Simon
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Naturresurser och hållbar utveckling.
    Johansson, Sheshti
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper.
    Höök, Mikael
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Naturresurser och hållbar utveckling.
    Phosphate rock production and depletion: Regional disaggregated modeling and global implications2014Inngår i: Resources, Conservation and Recycling, ISSN 0921-3449, E-ISSN 1879-0658, Vol. 93, s. 178-187Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Abstract Numerous recent studies discuss phosphate rock extraction, and some even propose that a peak in production could be reached in coming decades. This would have great consequences as phosphate rock based fertilizers are irreplaceable in modern agriculture. Studies suggesting an impending peak commonly use curve fitting models where mathematical functions are fitted to historical world production data, while studies using other methods reach completely different results. Also, a sudden increase in global reserve estimates is commonly used to dismiss these warnings, and has somewhat altered the debate. The recent multiplication of estimated reserves is mostly based on an increase of the Moroccan reserve estimate, leading to Morocco currently making up most of the global reserves. This study models global phosphate rock production using a disaggregated curve fitting model based on the production in individual major producing countries, providing a somewhat different view than most studies, and show that the global trade of phosphate rock could be completely dependent on Morocco in the future. There are several different factors that can potentially limit global production and these factors should be considered for the individual producing countries. Society’s total dependence on phosphate rock should be further investigated despite claims of large resource occurrences.

    Fulltekst (pdf)
    fulltext
  • 403.
    Wallner-Hahn, Sieglind
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Naturresurser och hållbar utveckling.
    Dahlgren, Malin
    Stockholm Univ, Dept Ecol Environm & Plant Sci, S-10691 Stockholm, Sweden..
    de la Torre-Castro, Maricela
    Stockholm Univ, Dept Phys Geog, S-10691 Stockholm, Sweden..
    Linking seagrass ecosystem services to food security: The example of southwestern Madagascar's small-scale fisheries2022Inngår i: Ecosystem Services, ISSN 2212-0416, E-ISSN 2212-0416, Vol. 53, artikkel-id 101381Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Small-scale fisheries (SSF) are crucial for food security and poverty alleviation. Many SSF are however under pressure, and in need of better management paying special attention to the key seascape ecosystems which are supporting them. This study investigates the importance of seagrass beds for SSF households and their food security in southwestern Madagascar. The specific aims of this study were to: i) analyze if and how seagrassassociated fish contributes to subsistence and/or the economy of local fishing households, ii) identify and compare seagrass ecosystem goods and services valued by local fishers in a rural and an urban setting, and iii) analyze links between local people and seagrasses in terms of local ecological knowledge, use and traditions. The results showed that seagrasses were the most important fishing habitats for most fishers. Seagrass-associated fish species were both the economically most important and most commonly fished species, and are a major source of protein in the region. Further, seagrass-derived sea urchins are important complements to local people's diets. The findings illustrate that seagrasses contribute both through subsistence and income generation to food security and wellbeing of coastal people in southwestern Madagascar. This highlights the need to consider seagrass ecosystems in management towards sustainable SSF and their ability to sustain food security for future generations.

    Fulltekst (pdf)
    fulltext
  • 404.
    Wang, Jianliang
    et al.
    China University of Petroleum - Beijing.
    Feng, Lianyong
    China University of Petroleum - Beijing.
    Steve, Mohr
    University of Technology Sydney.
    Tang, Xu
    China University of Petroleum - Beijing.
    Gail, Tverberg E.
    Our Finite World.
    Mikael, Höök
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Naturresurser och hållbar utveckling.
    China's unconventional oil: A review of its resources and outlook for long-term production2015Inngår i: Energy, ISSN 0360-5442, E-ISSN 1873-6785, Vol. 82, nr 3, s. 31-42Artikkel, forskningsoversikt (Fagfellevurdert)
    Abstract [en]

    Due to the expected importance of unconventional oil in China's domestic oil supply, this paper first investigates the four types of China's unconventional oil resources comprehensively: heavy and extra-heavy oil, oil sands, broad tight oil and kerogen oil. Our results show that OIP (Oil-in-Place) of these four types of resources amount to 19.64 Gt, 5.97 Gt, 25.74 Gt and 47.64 Gt respectively, while TRRs (technically recoverable resources) amount to 2.24 Gt, 2.26 Gt, 6.95 Gt and 11.98 Gt respectively. Next, the Geologic Resources Supply-Demand Model is used to quantitatively project the long-term production of unconventional oil under two resource scenarios (TRR scenario and Proved Reserve + Cumulative Production scenario). Our results indicate that total unconventional oil production will peak in 2068 at 0.351 Gt in TRR scenario, whereas peak year and peak production of PR (proved reserves) + CP (Cumulative Production) scenario are 2023 and 0.048 Gt, significantly earlier and lower than those of TRR scenario. The implications of this growth in production of unconventional oil for China are also analyzed. The results show that if the TRR scenario can be achieved, it will increase total supply and improve oil security considerably. However, achieving the production in TRR scenario has many challenges, and even if it is achieved, China will still need to rely on imported oil.

  • 405.
    Wang, Jianliang
    et al.
    China Univ Petr, Sch Business Adm, 18 Fuxue Rd, Beijing 102249, Peoples R China..
    Feng, Lianyong
    China Univ Petr, Sch Business Adm, 18 Fuxue Rd, Beijing 102249, Peoples R China..
    Tang, Xu
    China Univ Petr, Sch Business Adm, 18 Fuxue Rd, Beijing 102249, Peoples R China..
    Bentley, Yongmei
    Univ Bedfordshire, Sch Business, Luton LU1 3JU, Beds, England..
    Höök, Mikael
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Naturresurser och hållbar utveckling.
    The implications of fossil fuel supply constraints on climate change projections: A supply-side analysis2017Inngår i: Futures: The journal of policy, planning and futures studies, ISSN 0016-3287, E-ISSN 1873-6378, Vol. 86, s. 58-72Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Climate projections are based on emission scenarios. The emission scenarios used by the IPCC and by mainstream climate scientists are largely derived from the predicted demand for fossil fuels, and in our view take insufficient consideration of the constrained emissions that are likely due to the depletion of these fuels. This paper, by contrast, takes a supplyside view of CO2 emission, and generates two supply-driven emission scenarios based on a comprehensive investigation of likely long-term pathways of fossil fuel production drawn from peer-reviewed literature published since 2000. The potential rapid increases in the supply of the non-conventional fossil fuels are also investigated. Climate projections calculated in this paper indicate that the future atmospheric CO2 concentration will not exceed 610 ppm in this century; and that the increase in global surface temperature will be lower than 2.6 degrees C compared to pre-industrial level even if there is a significant increase in the production of non-conventional fossil fuels. Our results indicate therefore that the IPCC's climate projections overestimate the upper-bound of climate change. Furthermore, this paper shows that different production pathways of fossil fuels use, and different climate models, are the two main reasons for the significant differences in current literature on the topic.

  • 406.
    Wang, Jianliang
    et al.
    China Univ Petr, Sch Econ & Management, Beijing, Peoples R China..
    Tong, Fan
    Beihang Univ, Sch Econ & Management, Beijing, Peoples R China.;Lawrence Berkeley Natl Lab, Berkeley, CA USA..
    Höök, Mikael
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Naturresurser och hållbar utveckling.
    Upscaling Low-Carbon Energy Resources: Exploring the Material Supply Risk, Environmental Impacts and Response Policies: Editorial2021Inngår i: Frontiers in Energy Research, E-ISSN 2296-598X, Vol. 9, artikkel-id 792797Artikkel i tidsskrift (Annet vitenskapelig)
    Fulltekst (pdf)
    FULLTEXT01
  • 407.
    Wang, Siyun
    et al.
    China Univ Petr, Sch Econ & Management, Beijing 102249, Peoples R China..
    Tang, Xu
    China Univ Petr, Sch Econ & Management, Beijing 102249, Peoples R China.;China Univ Petr, Res Ctr Chinas Oil & Gas Ind Dev, Beijing, Peoples R China..
    Wang, Jianliang
    China Univ Petr, Sch Econ & Management, Beijing 102249, Peoples R China.;China Univ Petr, Res Ctr Chinas Oil & Gas Ind Dev, Beijing, Peoples R China..
    Zhang, Baosheng
    China Univ Petr, Sch Econ & Management, Beijing 102249, Peoples R China..
    Sun, Wangmin
    China Natl Petr Corp, Policy Res Off, Beijing 100724, Peoples R China..
    Höök, Mikael
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Naturresurser och hållbar utveckling.
    Environmental impacts from conventional and shale gas and oil development in China considering regional differences and well depth2021Inngår i: Resources, Conservation and Recycling, ISSN 0921-3449, E-ISSN 1879-0658, Vol. 167, artikkel-id 105368Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    China has stepped up its oil and gas development including unconventional resources as foreign dependence for oil and gas increased. Environmental impacts from the development phase has also caused widespread concern. To better understand environment impacts from current oil and gas development in China, a hybrid life cycle analysis (H-LCA) model was used to estimate the impact of six fields at the development stage based on data from 2017. The full environmental impact and full impact intensity (i.e., full environmental impact per unit of output by calorific value) of shale gas, conventional natural gas and oil development in China was compared and analyzed by eliminating well depth. Shale gas has 12.5% more environmental impact than conventional natural gas. Environmental impact of natural gas development is roughly 1.5 to 2 times that of conventional oil. Development of gas in Sichuan Basin have the greatest environmental impact, following southeast coast, Song Liao Basin, and Junggar Basin. However, the full impact intensity of shale gas development is more than five times that of conventional natural gas, but natural gas is still greener than conventional oil. The greatest full impact intensity is found in Junggar Basin, following Song Liao Basin and southeastern coast. From the comparison of full environmental impact and full impact intensity under per well depth, it's found that both of these are not positively correlated with reservoir depth and well depth even in the same basin. More attention should be paid to driving effects of specific reservoir developments and geological conditions.

  • 408.
    Wang, Wenhuan
    et al.
    Zhejiang Univ Technol, Sch Publ Adm, Hangzhou 310023, Peoples R China.;Fudan Univ, Fudan Tyndall Ctr, Dept Environm Sci & Engn, Shanghai 200438, Peoples R China..
    He, Yi
    Zhejiang Univ Technol, Sch Publ Adm, Hangzhou 310023, Peoples R China..
    Lei, Yu
    Zhejiang Univ Technol, Sch Publ Adm, Hangzhou 310023, Peoples R China..
    Gao, Wenqi
    Zhejiang Univ Technol, Sch Publ Adm, Hangzhou 310023, Peoples R China..
    Li, Yineng
    Zhejiang Univ Technol, Sch Publ Adm, Hangzhou 310023, Peoples R China..
    Lan, Hanlin
    Zhejiang Univ Technol, Inst Social Sci, Hangzhou 310023, Peoples R China..
    Zhuang, Shiheng
    Zhejiang Univ Technol, Sch Publ Adm, Hangzhou 310023, Peoples R China..
    Höök, Mikael
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Naturresurser och hållbar utveckling.
    Digital economy sectors are key CO2 transmission centers in the economic system2023Inngår i: Journal of Cleaner Production, ISSN 0959-6526, E-ISSN 1879-1786, Vol. 407, artikkel-id 136873Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The rapid growth of the digital economy has driven economic development, but the massive demand for elec-tricity from digital reforms, coupled with China's coal-based power generation, has created a significant CO2 emission problem. Previous studies have assessed digital economy sectors with an incomplete scope and a lack of carbon emissions assessment at the intermediary-side. To fill these gaps, this study assessed CO2 emissions using input-output modeling of the core industry sector of the digital economy and the industrial digitalization sector at the production, intermediary, and demand sides, and identified key CO2 transmission centers. The results show the following: (1) Digital economy sectors had a high betweenness and were important CO2 transmission centers in the economic system, transmitting more than 4.08 billion tonnes of betweenness-based CO2 emissions; (2) specifically, the industrial digitalization sector transmitted the most CO2 in the economic system, and the digital product manufacturing sector was the core industry sector with the highest betweenness and a strong trans-mission effect on the CO2 emissions in the supply chain; (3) digital economy sectors had large CO2 emissions on the production, intermediary, and demand sides, and transmitted CO2 more through the demand-side and key transmission centers. These results suggest that digital economy sectors can decarbonize and reduce CO2 emissions by (1) improving material use efficiency in the digital product manufacturing sector, (2) reducing the use of carbon-intensive energy and materials in the digital economy sectors, and (3) establishing CO2 emission disclosure rules, incentives, and penalties.

  • 409.
    Wang, Wenhuan
    et al.
    China University of Petroleum, Beijing.
    Tang, Xu
    China University of Petroleum, Beijing.
    Yang, Xiaoguang
    China University of Petroleum, Beijing; Chinese Acad Sci, Acad Math & Syst Sci, Beijing.
    Zhang, Baosheng
    China University of Petroleum, Beijing.
    Zhang, Yiqiong
    UNSW Business School, The University of New South Wales, Sydney.
    Höök, Mikael
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Naturresurser och hållbar utveckling.
    Energy savings in China's energy sectors and contributions to air pollution reduction in the 12th Five Year Plan2018Inngår i: Journal of Cleaner Production, ISSN 0959-6526, E-ISSN 1879-1786, Vol. 200, s. 305-317Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Energy efficiency and air pollution mitigation are critical issues for future development of the Chinese economy. Energy savings and their contribution to reduced air pollution from energy sectors during the 12th Five Year Plan are assessed using input-output analysis. A new dynamic quantitative method was developed to explore key sectors and identify critical paths for efficient emission reductions from energy industries. All the energy intensive key sectors, including Metal, Power, Chemical Products, Nonmetal are used to determine critical paths for emission reductions. Results indicate that the Coal Sector failed to achieve significant energy savings and did not contribute to direct and overall emissions reductions. The Oil Sector only achieved co-effects for reduction of overall waste gas, SO2, and particulates, while the Power Sector achieved emission reductions of all air pollutants. The results suggest that Chinese government should enact four main measures to achieve effective targets for energy savings and emission reductions: (1) Strengthen energy conservation in Coal and Oil Sectors, particularly the Coal Sector. (2) Promote energy conservation and emission reductions in highly energy intensive sectors to help emission reductions from other sectors. (3) Promote synergy effects of energy savings and emission reductions to enterprises. (4) Set lowest emission reduction targets for each department combined with targets for energy savings.

  • 410.
    Warren, Charles
    et al.
    University of St Andrews.
    Jayne, Glass
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Naturresurser och hållbar utveckling.
    Managing Scotland's Environment2024 (oppl. 3)Bok (Fagfellevurdert)
    Abstract [en]

    Text from the publisher, Edinburgh University Press:

    Completely revised and updated to reflect the current debates in Scotland’s natural environment.

    • Why have Scotland’s landscapes and wildlife been the focus of such persistent disagreement?
    • Why is it so difficult to reconcile the competing demands of society and nature?
    • Is it possible to meet our needs for food and energy while also satisfying our desire to protect and enhance the natural heritage?
    • To what extent can the management of the various land uses be effectively integrated?
    • Does the imperative of tackling climate change require a radically different approach to environmental management?

    Written in the light of international thinking on environment management, this third edition tackles the hottest debates of recent years – deer management, the post-Brexit future of farming, land reform, rewilding v. repeopling, windfarms and conflicts between game sport and conservation.

    Underlying all the practical and policy choices are intriguing ethical and philosophical considerations which the book addresses head on, including debates about the goals of conservation in a pervasively humanised world. This is an ideal text for those studying Scotland’s environment at an undergraduate and graduate level, as well as for those already involved in – or interested in – managing land and nature in Scotland. Throughout, it is well illustrated with photographs and specially prepared maps and diagrams.

  • 411.
    Weis, Franz
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Mineralogi, petrologi och tektonik.
    Troll, Valentin R.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Naturresurser och hållbar utveckling.
    Jonsson, Erik
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Mineralogi, petrologi och tektonik.
    Högdahl, Karin
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Mineralogi, petrologi och tektonik.
    Harris, Chris
    Department of Geological Sciences, University of Cape Town, 13 University Avenue, Rondebosch, 7701, South Africa.
    Sun, Weian
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper. School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, 230009, Anhui, China.
    Nilsson, Katarina P.
    Svemin-the Industry Organization for Mines, Mineral and Metal Producers in Sweden, Storgatan, Box 555 25, 102 04, Stockholm, Sweden.
    Dahrén, Börje
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Mineralogi, petrologi och tektonik.
    Absence of hydrothermal oxygen isotope variations in host rocks supports magmatic origin of the giant Grängesberg iron oxide–apatite (IOA) deposit, Central Sweden2022Inngår i: International journal of earth sciences, ISSN 1437-3254, E-ISSN 1437-3262, Vol. 111, nr 2, s. 425-437Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The origin of Kiruna-type iron oxide–apatite ores is controversial, and debate presently centres on a ‘magmatic’ versus a ‘hydrothermal’ mode of formation. To complement recent investigations on the Grängesberg iron oxide–apatite ore deposit in the northwestern part of the Palaeoproterozoic Bergslagen ore province in central Sweden, we investigated the oxygen isotope composition of the host rocks of this large iron oxide–apatite ore body. As the metavolcanic and metagranitoid country rocks around the Grängesberg ore body either pre-date or are coeval with ore formation, they would be expected to record an extensive isotopic imprint if the ore body had formed by large-scale hydrothermal processes involving an externally sourced fluid. A direct magmatic formation process, in turn, would have produced localized alteration only, concentrated on the immediate vicinity of the ore body. Here, we test these two hypotheses by assessing the oxygen isotope variations in the host rocks around the main Grängesberg iron oxide–apatite ore body. We analysed oxygen isotopes in quartz from metavolcanic (n = 17) and metagranitoid host rocks (n = 14) from the vicinity of the ore body, and up to 2 km distance along and across the strike of the ore body. Remarkably, we find no significant variation in δ18O values with distance from the ore body, or any deviations in country rock δ18O from common magmatic and/or regional values. Only two samples show shifts to values more negative than the common magmatic range, indicating highly localized hydrothermal overprint only. As a large-scale, low-temperature hydrothermal origin of the ore body through voluminous fluid percolation would be expected to have left a distinct imprint on the oxygen isotope values of the country rocks, our results are more consistent with an ortho-magmatic origin for the Grängesberg iron oxide–apatite ore.

    Fulltekst (pdf)
    fulltext
  • 412.
    Wernersson, Hanna Charlotta
    et al.
    Stockholm Univ, Stockholm Resilience Ctr, Stockholm, Sweden.;Gothenburg Univ, Sch Global Studies, Gothenburg, Sweden..
    Boonstra, Wiebren Johannes
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Naturresurser och hållbar utveckling.
    Making meat moral: A comparison of rearing and killing practices in Swedish cattle farming2024Inngår i: Sociologia Ruralis, ISSN 0038-0199, E-ISSN 1467-9523, Vol. 64, nr 2, s. 254-279Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    To eat or not eat meat? That has become a central sustainability question. This article zooms in on the moral sustainability of cattle farming and does so from an on-farm perspective: through an ethnographic study of two Swedish cattle farms, we explore how rearing animals for food is made moral. The farms represent two distinct styles of farming, and discursive and non-discursive methods are used to analyse differences in narratives and practices. We combine insights from the farming styles literature with affective and multispecies approaches to theorise farming moralities as situated, embedded and relational beliefs that pertain to practices of work. Our study demonstrates how scale and endogeneity are key factors shaping farming morality by generating different on-farm notions of animal agency and interspecies relationships. We discuss the implications of this conclusion for a potential shift in meat practices.

    Fulltekst (pdf)
    fulltext
  • 413.
    West, Gabriel
    et al.
    Stockholm Univ, Dept Geol Sci, Stockholm, Sweden.;Stockholm Univ, Bolin Ctr Climate Res, Stockholm, Sweden..
    Nilsson, Andreas
    Lund Univ, Dept Geol, Quaternary Sci, Lund, Sweden..
    Geels, Alexis
    Stockholm Univ, Dept Phys Geog, Stockholm, Sweden..
    Jakobsson, Martin
    Stockholm Univ, Dept Geol Sci, Stockholm, Sweden.;Stockholm Univ, Bolin Ctr Climate Res, Stockholm, Sweden..
    Moros, Matthias
    Leibniz Inst Balt Sea Res Warnemunde, Rostock, Germany..
    Muschitiello, Francesco
    Univ Cambridge, Dept Geog, Cambridge, England..
    Pearce, Christof
    Stockholm Univ, Dept Geol Sci, Stockholm, Sweden.;Stockholm Univ, Bolin Ctr Climate Res, Stockholm, Sweden.;Aarhus Univ, Dept Geosci, Aarhus, Denmark..
    Snowball, Ian
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Geofysik. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Naturresurser och hållbar utveckling.
    O'Regan, Matt
    Stockholm Univ, Dept Geol Sci, Stockholm, Sweden.;Stockholm Univ, Bolin Ctr Climate Res, Stockholm, Sweden..
    Late Holocene Paleomagnetic Secular Variation in the Chukchi Sea, Arctic Ocean2022Inngår i: Geochemistry Geophysics Geosystems, E-ISSN 1525-2027, Vol. 23, nr 5, artikkel-id e2021GC010187Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The geomagnetic field behavior in polar regions remains poorly understood and documented. Although a number of Late Holocene paleomagnetic secular variation (PSV) records exist from marginal settings of the Amerasian Basin in the Arctic Ocean, their age control often relies on a handful of radiocarbon dates to constrain ages over the past 4,200 years. Here we present well-dated Late Holocene PSV records from two sediment cores recovered from the Chukchi Sea, Arctic Ocean. The records are dated using 26 C-14 measurements, with local marine reservoir corrections calibrated using tephra layers from the 3.6 cal ka BP Aniakchak eruption in Northern Alaska. These C-14-based chronologies are extended into the post-bomb era using caesium-137 dating, and mercury isochrons. Paleomagnetic measurements and rock magnetic analyses reveal stable characteristic remanent magnetization directions, and a magnetic mineralogy dominated by low-coercivity minerals. The PSV records conform well to global spherical harmonic field model outputs. Centennial to millennial scale directional features are synchronous between the cores and other Western Arctic records from the area. Due to the robust chronology, these new high-resolution PSV records provide a valuable contribution to the characterization of geomagnetic field behavior in the Arctic over the past few thousand years, and can aid in developing age models for suitable sediments found in this region.

    Fulltekst (pdf)
    fulltext
  • 414.
    Whitley, Sean
    et al.
    Keele Univ, Sch Geog Geol & Environm, Keele ST5 5BG, Staffs, England..
    Halama, Ralf
    Keele Univ, Sch Geog Geol & Environm, Keele ST5 5BG, Staffs, England..
    Gertisser, Ralf
    Keele Univ, Sch Geog Geol & Environm, Keele ST5 5BG, Staffs, England..
    Preece, Katie
    Swansea Univ, Coll Sci, Dept Geog, Swansea SA2 8PP, W Glam, Wales..
    Deegan, Frances
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Naturresurser och hållbar utveckling.
    Troll, Valentin R.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Naturresurser och hållbar utveckling. Univ Padjajaran UNPAD, Fac Geol Engn, Bandung 40132, Indonesia..
    Magmatic and Metasomatic Effects of Magma-Carbonate Interaction Recorded in Calc-silicate Xenoliths from Merapi Volcano (Indonesia)2020Inngår i: Journal of Petrology, ISSN 0022-3530, E-ISSN 1460-2415, Vol. 61, nr 4, artikkel-id egaa048Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Magma-carbonate interaction is an increasingly recognized process occurring at active volcanoes worldwide, with implications for the magmatic evolution of the host volcanic systems, their eruptive behaviour, volcanic CO2 budgets, and economic mineralization. Abundant calc-silicate skarn xenoliths are found at Merapi volcano, Indonesia. We identify two distinct xenolith types: magmatic skarn xenoliths, which contain evidence of formation within the magma; and exoskarn xenoliths, which more likely represent fragments of crystalline metamorphosed wall rocks. The magmatic skarn xenoliths comprise distinct compositional and mineralogical zones with abundant Ca-enriched glass (up to 10 wt % relative to lava groundmass), mineralogically dominated by clinopyroxene (En(15-43)Fs(14-36)Wo(41-51)) + plagioclase (An(37-100)) +/- magnetite in the outer zones towards the lava contact, and by wollastonite +/- clinopyroxene (En(17-38)Fs(8-34)Wo(49-59)) +/- plagioclase (An(46-100)) +/- garnet (Gr(s0-65)Adr(24-75)Sc(h0-76)) +/- quartz in the xenolith cores. These zones are controlled by Ca transfer from the limestone protolith to the magma and by the transfer of magma-derived elements in the opposite direction. In contrast, the exoskarn xenoliths are unzoned and essentially glassfree, representing equilibration at sub-solidus conditions. The major mineral assemblage in the exoskarn xenoliths is wollastonite + garnet (Grs(73-97)Adr(3-24)) + Ca-Al-rich clinopyroxene (CaTs0-38) + anorthite +/- quartz, with variable amounts of either quartz or melilite (Geh(42-91)) + spinel. Thermobarometric calculations, fluid-inclusion microthermometry and newly calibrated oxybarometry based on Fe-3+/Sigma Fe in clinopyroxene indicate magmatic skarn xenolith formation conditions of similar to 850 +/- 45 degrees C, < 100 MPa and at an oxygen fugacity between the NNO (nickel-nickel oxide) and HM (hematite-magnetite) buffer. The exoskarn xenoliths, in turn, formed at 510-910 degrees C under oxygen-fugacity conditions between NNO and air. These high oxygen fugacities are likely imposed by the large volumes of CO2 liberated from the carbonate. Halogen- and sulphur-rich mineral phases in the xenoliths testify to infiltration by a magmatic brine. In some xenoliths, this is associated with the precipitation of copper-bearing mineral phases by sulphur dissociation into sulphide and sulphate, indicating potential mineralization in the skarn system below Merapi. The compositions of many xenolith clinopyroxene and plagioclase crystals overlap with that of magmatic minerals, suggesting that the crystal cargo in Merapi magmas may contain a larger proportion of skarn-derived xenocrysts than previously recognized. Assessment of xenolith formation timescales demonstrates that magma-carbonate interaction and associated CO2 release could affect eruption intensity, as recently suggested for Merapi and similar carbonate-hosted volcanoes elsewhere.

  • 415.
    Wiers, Steffen
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Naturresurser och hållbar utveckling.
    The Arctic Ocean Palaeomagnetic Record: A Stratigraphic Approach2020Doktoravhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    The Arctic Ocean is an essential component of the global climate system, yet understanding of its geological archives is hampered by difficulties in age modelling. In addition to the scarcity of dateable microfossils, the palaeomagnetic record of Arctic sediments is unusual. Palaeomagnetic inclination sequences from Arctic sediments display numerous changes from steep positive to steep negative values that do not match the established geomagnetic polarity timescale. Independent age constraints suggest that most changes in the upper few meters below the sea-floor took place within the Brunhes normal chron. It has been suggested that zones of reversed inclination contain reversed titanomaghemite, formed by sea-floor oxidation of titanomagnetite. Until now, self-reversed components of Arctic records have not been studied in the context of regional stratigraphic frameworks, which could elucidate the relative timing of significant diagenetic changes, or their synchronicity between different records.

    This thesis examines marine sediments from three different areas of the Arctic. All records were evaluated within their regional stratigraphic frameworks and cross-correlated with existing records. A combined approach that used magnetic and sedimentological data was employed to identify the effect of depositional and diagenetic processes on the palaeo- and rock magnetic properties. Chemical, palaeo- and rock magnetic investigations on sediments from the Arlis Plateau and the Lomonosov Ridge revealed a complex magnetic mineralogy and constrained reversed inclinations to a medium to high coercivity magnetic phase. The important role of manganese in the Arctic Ocean, its involvement in iron (oxyhydr)oxide enrichment during interglacial periods and its role in diagenesis led to the hypotheses that an unidentified magnetic ferromanganese phase is involved in the anomalous palaeomagnetic record. Elevated pore water manganese concentration a few meters below the sea-floor in central Arctic sediments is evidence of ongoing diagenesis that involves manganese-oxides. A relationship with iron-oxides is likely and can lead to alteration of existing magnetic minerals and the precipitation of new magnetic phases. This approach revealed 1) an inconsistent alignment of zones of negative inclination when different records were correlated using lithological parameters, 2) no correlation of inclination changes with stratigraphic boundaries and 3) a link between diagenesis and the palaeomagnetic record.

    Delarbeid
    1. Late Pleistocene chronology of sediments from the Yermak Plateau and uncertainty in dating based on geomagnetic excursions
    Åpne denne publikasjonen i ny fane eller vindu >>Late Pleistocene chronology of sediments from the Yermak Plateau and uncertainty in dating based on geomagnetic excursions
    2019 (engelsk)Inngår i: Geochemistry Geophysics Geosystems, E-ISSN 1525-2027, Vol. 20, nr 7, s. 3289-3310Artikkel i tidsskrift (Fagfellevurdert) Published
    Abstract [en]

    The Yermak Plateau is one of several regions in the Arctic Ocean where paleomagnetism yields controversial results. Despite low sedimentation rates, late Pleistocene paleomagnetic excursions have been reconstructed from many cores in the region, but they are characterized by considerably longer durations when compared to established ones. Self‐reversal during maghemitization of (titano)magnetite has been proposed as one explanation. Rock magnetic, 14C dating, sedimentological and stable isotope (δ18O) methods were employed to three new sediment cores to put paleomagnetic results in the context of the regional stratigraphy and chronology. Coherence of lithological parameters and δ18O variations validated the ratio of anhysteretic remanent susceptibility to bulk magnetic susceptibility (κARM/κ) as a parameter for cross‐core correlation. As established by earlier studies, we use the link between glacial/interglacial cycles and κARM/κ to tune our records to a global δ18O stack, which provides age models that are independent of radicarbon ages and paleomagnetic data. Our results show that zones of negative magnetic inclination are asynchronous across the plateau. Alternating field demagnetization data revealed that negative inclinations are contained in a medium‐high‐coercivity (>25–35 mT) magnetic phase that may be the result of postdepositional alteration of (titano)magnetite. We note a positive relationship between water depth and excursion duration, which may be driven by changes in water mass circulation on glacial/interglacial timescales.

    HSV kategori
    Identifikatorer
    urn:nbn:se:uu:diva-385900 (URN)10.1029/2018GC007920 (DOI)000480282600011 ()
    Forskningsfinansiär
    Swedish Research Council, 2014-4108
    Tilgjengelig fra: 2019-06-17 Laget: 2019-06-17 Sist oppdatert: 2023-02-22bibliografisk kontrollert
    2. The Arctic Ocean Manganese Cycle, an Overlooked Mechanism in the Anomalous Palaeomagnetic Sedimentary Record
    Åpne denne publikasjonen i ny fane eller vindu >>The Arctic Ocean Manganese Cycle, an Overlooked Mechanism in the Anomalous Palaeomagnetic Sedimentary Record
    Vise andre…
    2020 (engelsk)Inngår i: Frontiers in Earth Science, E-ISSN 2296-6463, Vol. 8, artikkel-id 75Artikkel i tidsskrift (Fagfellevurdert) Published
    Abstract [en]

    Palaeomagnetic records obtained from Arctic Ocean sediments are controversial because they include numerous and anomalous geomagnetic excursions. Age models that do not rely on palaeomagnetic interpretations reveal that the majority of the changes in inclination do not concur with the established global magnetostratigraphy. Seafloor oxidation of (titano)magnetite to (titano)maghemite with self-reversal of the (titano)maghemite coatings has been proposed as an explanation. However, no existing model can explain when the self-reversed components formed and how they are linked to litho-stratigraphic changes in Arctic Ocean sediments. In this study, we present new palaeo- and rock magnetic measurements of a sediment core recovered from the Arlis Plateau, close to the East Siberian Shelf. The magnetic data set is evaluated in the context of the regional stratigraphy and downcore changes in physical and chemical properties. By cross-core correlation, we show that magnetic inclination changes in the region do not stratigraphically align, similar to results of studies of sediments from the Lomonosov Ridge and Yermak Plateau. Rock magnetic and chemical parameters indicate post-depositional diagenetic changes in the magnetic mineral assemblage that can be linked to manganese cycling in the Arctic Ocean. The potential presence of a magnetic remanence bearing manganese-iron oxide phase, which can undergo self-reversal, leads to an alternative hypothesis to primary seafloor oxidation of (titano)magnetite. This phase may form by precipitation from seawater or by changing redox conditions in the sediment column by mineral precipitation from ions dissolved in pore water. These findings highlight the need for further investigation into the magnetic mineral assemblage, its link to manganese cycling and pore water geochemistry in Arctic Ocean sediments.

    HSV kategori
    Identifikatorer
    urn:nbn:se:uu:diva-408181 (URN)10.3389/feart.2020.00075 (DOI)000525716000001 ()
    Forskningsfinansiär
    Swedish Research Council, 2014-4108
    Tilgjengelig fra: 2020-04-05 Laget: 2020-04-05 Sist oppdatert: 2023-08-28bibliografisk kontrollert
    3. Post-depositional diagenesis in Arctic Ocean sediments and its implications for the palaeomagnetic record
    Åpne denne publikasjonen i ny fane eller vindu >>Post-depositional diagenesis in Arctic Ocean sediments and its implications for the palaeomagnetic record
    Vise andre…
    (engelsk)Manuskript (preprint) (Annet vitenskapelig)
    HSV kategori
    Identifikatorer
    urn:nbn:se:uu:diva-408183 (URN)
    Tilgjengelig fra: 2020-04-05 Laget: 2020-04-05 Sist oppdatert: 2020-04-13
    4. Palaeopca, a Tool to Unlock the full Potential of Principal Component Analysis in Palaeomagnetism
    Åpne denne publikasjonen i ny fane eller vindu >>Palaeopca, a Tool to Unlock the full Potential of Principal Component Analysis in Palaeomagnetism
    (engelsk)Manuskript (preprint) (Annet vitenskapelig)
    HSV kategori
    Identifikatorer
    urn:nbn:se:uu:diva-408184 (URN)
    Tilgjengelig fra: 2020-04-05 Laget: 2020-04-05 Sist oppdatert: 2020-04-13
    Fulltekst (pdf)
    fulltext
    Download (jpg)
    presentationsbild
  • 416.
    Wiers, Steffen
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Naturresurser och hållbar utveckling.
    Almqvist, Bjarne
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Geofysik.
    Palaeopca, a Tool to Unlock the full Potential of Principal Component Analysis in PalaeomagnetismManuskript (preprint) (Annet vitenskapelig)
  • 417.
    Wiers, Steffen
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Naturresurser och hållbar utveckling.
    Snowball, Ian
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Naturresurser och hållbar utveckling.
    O'Regan, Matt
    Stockholm Univ, Dept Geol Sci, Stockholm, Sweden.
    Almqvist, Bjarne
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Geofysik.
    Late Pleistocene chronology of sediments from the Yermak Plateau and uncertainty in dating based on geomagnetic excursions2019Inngår i: Geochemistry Geophysics Geosystems, E-ISSN 1525-2027, Vol. 20, nr 7, s. 3289-3310Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The Yermak Plateau is one of several regions in the Arctic Ocean where paleomagnetism yields controversial results. Despite low sedimentation rates, late Pleistocene paleomagnetic excursions have been reconstructed from many cores in the region, but they are characterized by considerably longer durations when compared to established ones. Self‐reversal during maghemitization of (titano)magnetite has been proposed as one explanation. Rock magnetic, 14C dating, sedimentological and stable isotope (δ18O) methods were employed to three new sediment cores to put paleomagnetic results in the context of the regional stratigraphy and chronology. Coherence of lithological parameters and δ18O variations validated the ratio of anhysteretic remanent susceptibility to bulk magnetic susceptibility (κARM/κ) as a parameter for cross‐core correlation. As established by earlier studies, we use the link between glacial/interglacial cycles and κARM/κ to tune our records to a global δ18O stack, which provides age models that are independent of radicarbon ages and paleomagnetic data. Our results show that zones of negative magnetic inclination are asynchronous across the plateau. Alternating field demagnetization data revealed that negative inclinations are contained in a medium‐high‐coercivity (>25–35 mT) magnetic phase that may be the result of postdepositional alteration of (titano)magnetite. We note a positive relationship between water depth and excursion duration, which may be driven by changes in water mass circulation on glacial/interglacial timescales.

  • 418.
    Wiers, Steffen
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Naturresurser och hållbar utveckling.
    Snowball, Ian
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Geofysik. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Naturresurser och hållbar utveckling.
    O'Regan, Matt
    Mörth, Carl-Magnus
    Svedlindh, Peter
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för materialvetenskap, Fasta tillståndets fysik.
    Almqvist, Bjarne
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Geofysik.
    Post-depositional diagenesis in Arctic Ocean sediments and its implications for the palaeomagnetic recordManuskript (preprint) (Annet vitenskapelig)
  • 419.
    Wiers, Steffen
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Naturresurser och hållbar utveckling.
    Snowball, Ian
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Geofysik. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Naturresurser och hållbar utveckling.
    O'Regan, Matt
    Department of Geological Sciences, Stockholm University, Stockholm, Sweden.
    Pearce, Christof
    Department of Geoscience and Arctic Research Centre, Aarhus University, Aarhus, Denmark.
    Almqvist, Bjarne
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Geofysik.
    The Arctic Ocean Manganese Cycle, an Overlooked Mechanism in the Anomalous Palaeomagnetic Sedimentary Record2020Inngår i: Frontiers in Earth Science, E-ISSN 2296-6463, Vol. 8, artikkel-id 75Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Palaeomagnetic records obtained from Arctic Ocean sediments are controversial because they include numerous and anomalous geomagnetic excursions. Age models that do not rely on palaeomagnetic interpretations reveal that the majority of the changes in inclination do not concur with the established global magnetostratigraphy. Seafloor oxidation of (titano)magnetite to (titano)maghemite with self-reversal of the (titano)maghemite coatings has been proposed as an explanation. However, no existing model can explain when the self-reversed components formed and how they are linked to litho-stratigraphic changes in Arctic Ocean sediments. In this study, we present new palaeo- and rock magnetic measurements of a sediment core recovered from the Arlis Plateau, close to the East Siberian Shelf. The magnetic data set is evaluated in the context of the regional stratigraphy and downcore changes in physical and chemical properties. By cross-core correlation, we show that magnetic inclination changes in the region do not stratigraphically align, similar to results of studies of sediments from the Lomonosov Ridge and Yermak Plateau. Rock magnetic and chemical parameters indicate post-depositional diagenetic changes in the magnetic mineral assemblage that can be linked to manganese cycling in the Arctic Ocean. The potential presence of a magnetic remanence bearing manganese-iron oxide phase, which can undergo self-reversal, leads to an alternative hypothesis to primary seafloor oxidation of (titano)magnetite. This phase may form by precipitation from seawater or by changing redox conditions in the sediment column by mineral precipitation from ions dissolved in pore water. These findings highlight the need for further investigation into the magnetic mineral assemblage, its link to manganese cycling and pore water geochemistry in Arctic Ocean sediments.

    Fulltekst (pdf)
    fulltext
  • 420.
    Wijermans, Nanda
    et al.
    Stockholm Univ, Stockholm Resilience Ctr, Kraftriket 2B, SE-10691 Stockholm, Sweden.
    Boonstra, Wiebren J.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Naturresurser och hållbar utveckling. Stockholm Univ, Stockholm Resilience Ctr, Kraftriket 2B, SE-10691 Stockholm, Sweden.
    Orach, Kirill
    Stockholm Univ, Stockholm Resilience Ctr, Kraftriket 2B, SE-10691 Stockholm, Sweden.
    Hentati-Sundberg, Jonas
    Swedish Univ Agr Sci, Inst Marine Res, Dept Aquat Resources, Lysekil, Sweden.
    Schlüter, Maja
    Stockholm Univ, Stockholm Resilience Ctr, Kraftriket 2B, SE-10691 Stockholm, Sweden.
    Behavioural diversity in fishing: Towards a next generation of fishery models2020Inngår i: Fish and Fisheries, ISSN 1467-2960, E-ISSN 1467-2979, Vol. 21, nr 5, s. 872-890Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Despite improved knowledge and stricter regulations, numerous fish stocks remain overharvested. Previous research has shown that fisheries management may fail when the models and assessments used to inform management are based on unrealistic assumptions regarding fishers' decision-making and responses to policies. Improving the understanding of fisher behaviour requires addressing its diversity and complexity through the integration of social science knowledge into modelling. In our paper, we review and synthesize state-of-the-art research on both social science's understanding of fisher behaviour and the representation of fisher decision-making in scientific models. We then develop and experiment with an agent-based social-ecological fisheries model that formalizes three different fishing styles. Thereby we reflect on the implications of our incorporation of behavioural diversity and contrast it with the predominant assumption in fishery models: fishing practices being driven by rational profit maximizing. We envision a next generation of fisheries models and management that account for social scientific knowledge on individual and collective human behaviours. Through our agent-based model, we demonstrate how such an integration is possible and propose a scientific approach for reducing uncertainty based on human behavioural diversity in fisheries. This study serves to lay the foundations for a next generation of social-ecological fishery models that account for human behavioural diversity and social and ecological complexity that are relevant for a realistic assessment and management of fishery sustainability problems.

    Fulltekst (pdf)
    fulltext
  • 421.
    Wiklund, Sofia
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Naturresurser och hållbar utveckling. SLU, Institutionen för skogsekonomi.
    Evaluating Physical Climate Risk for Equity Funds with Quantitative Modelling: How Exposed are Sustainable Funds?2020Independent thesis Advanced level (professional degree), 20 poäng / 30 hpOppgave
    Abstract [en]

    The climate system is undergoing rapid changes because of anthropogenic emissions of greenhouse gases. The effects from a warmer climate are already noticeable today with more frequent extreme weather events. These extreme weather events have financial consequences and pose risks to the financial system. This study evaluates such physical climate risks for the periods 2021-2025 and 2026-2030 by developing a quantitative model. Physical risks are here limited to heat waves, heavy precipitation events, drought and tropical cyclones. The model applies climate data from CMIP5 to evaluate hazard intensity at the location of a company. Vulnerability of the certain hazard is determined based on the sector. Physical risks from supply chain relations are also considered. The result is then aggregated on portfolio level. The model is applied to compare the exposure of physical climate risks on sustainable equity funds with the exposure on the general market and to determine what characteristics that contribute to low respectively high climate risks.

    Generally, the total climate risk proves to be lower for the period 2021-2025 compared to 2026-2030 because of the natural variability in the climate system. Europe has the lowest climate risk, and the GICS-sector with the highest risk is Real Estate. No clear conclusion can be drawn in the comparison of physical risk exposure between sustainable funds and the market; however, the result indicates that sustainable funds select securities of lower risk within a specific investment universe. The average sustainable funds select equities with lower risk within regions, sectors and market cap sizes in almost all studied cases. Regional allocation proves to be important for the exposure to physical climate risks. This is also related to market cap size since larger companies are likely to have their assets distributed in several countries which contributes to diversification. On fund level, the strategy of carbon minimising is shown to have no significant impact on physical climate risks, neither positively nor negatively.

    The awareness among investors on physical climate risks is currently low, and sustainability labels seem to offer no guarantee for minimising physical risk exposure. This study adds to the very small pool of studies on physical climate risks in investment management and provides a market wide overview. Hopefully, development of this research area can contribute to increase the awareness of investors and thereby drive capital towards a more resilient society.

    Fulltekst (pdf)
    fulltext
  • 422. Wikström, Fredrik
    et al.
    Karlsson, Mikael
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Naturresurser och hållbar utveckling.
    Hållbar utveckling i skogslandskapet: med energi i fokus2004Inngår i: Inte bara träd: hållbart mångbruk av skogslandskapet / [ed] Front Cover Gunilla Almerad, Gabriel Bladh, Bengt Månsson, Bengt Nyberg, Stockholm: Carlsson , 2004Kapittel i bok, del av antologi (Annet (populærvitenskap, debatt, mm))
  • 423.
    Willerström, Jakob
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Naturresurser och hållbar utveckling.
    Modelling CO2 emissions from passenger cars for Swedish municipalities2019Independent thesis Advanced level (professional degree), 20 poäng / 30 hpOppgave
    Abstract [en]

    The ratification of the Paris agreement has motivated nations to investigate howsubstantial greenhouse gas emission reductions can be accomplished for limiting globalwarming under two degrees Celsius. In Sweden, the magnitude of CO2 emissionsfrom domestic transportation is approximately one third of all other emission sectorscombined. It is therefore crucial for Sweden to stimulate substantial reductions in thissector. Local actors' possibilities to contribute to climate change mitigation arecentral to succeed albeit constrained in the transportation sector due to data andresource limitations. With the intention to benefit local climate change mitigationwork, a model capable of estimating the tailpipe CO2 emissions from passenger carswas created. The modelling exploited traffic work data from mandatory vehiclechecks conducted in Sweden for calculating CO2 emissions per car and year for theperiod of 1999-2017, to thereafter be aggregated for a municipality, i.e. a bottom-upapproach. The model and model results have been validated with official data andemission factors from HBEFA, whereas model configurations have also beencontrolled with sensitivity analyses. The model was applied for a case-study, Järfälla, amunicipality who recently had a carbon budget developed. Model results illustrated anincreasing trend in CO2 emissions for the period of 1999-2017 and were alsopresented over fuel technology, mass and car age. Moreover, the model was appliedto produce CO2 estimates per postal codes in the municipality for 2017 and toquantify the effect of explorative scenarios, i.e. policy goals, on CO2 emissions.

    Fulltekst (pdf)
    Modelling CO2 emissions from passenger cars for Swedish municipalities
  • 424.
    Winkler, Anja
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Naturresurser och hållbar utveckling.
    Environmental performance of a t-shirt in a clothing rental: A case study using life cycle assessment2023Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    The production of clothing is linked directly to the degradation of ecosystems, depletion of freshwater and loss of biodiversity. It is one of the most polluting global industries and consumes high quantities of fuel, chemicals, water, and energy. One approach of the sharing economy to decrease the environmental impacts of the fashion industry is clothing rentals. This thesis was conducted to assess the environmental impacts of the clothing rental Kleiderei Köln, located in Cologne, Germany. Three research questions were formulated: (1) What are the environmental impacts of a t-shirt that is part of the Kleiderei Köln clothing rental? (2) What are potential hotspots in the life cycle of a t-shirt that is part of the Kleiderei Köln clothing rental? (3) How does the impact of a t-shirt that is part of the Kleiderei Köln clothing rental differ from a generic t-shirt? To answer the research questions, this study performed an LCA of a t-shirt and collected self-reported behaviour for an informed use phase modelling. The LCA modelled the life cycle of the t-shirt in two product systems, one in a generic use with a primary garment and one that is present in the Kleiderei Köln, a secondary garment. The functional unit was 188 days of wear. A hotspot within the company life cycle was identified as the transportation within the use phase. Comparing the two product systems showcased that the generic product system has higher environmental impacts over the complete life cycle. The use phase was higher for the Kleiderei Köln product system, where the transportation of the rented garment from and back to the store was identified main driver for the difference in impacts. This thesis contributed with a first assessment of the environmental performance of a garment within a clothing rental in the German context and collected case-specific consumer behaviour that can inform future evaluations.

  • 425.
    Woods, P J
    et al.
    Marine and Freshwater Research Institute, Fornubuðir 5, 220 Hafnarfjörður, Iceland;Faculty of Life and Environmental Sciences, University of Iceland, Sturlugötu 7, 101 Reykjavík, Iceland.
    Macdonald, J I
    Oceanic Fisheries Programme, Pacific Community (SPC), BP D5 98848, Nouméa, New Caledonia.
    Bárðarson, H
    Marine and Freshwater Research Institute, Fornubuðir 5, 220 Hafnarfjörður, Iceland;Faculty of Life and Environmental Sciences, University of Iceland, Sturlugötu 7, 101 Reykjavík, Iceland.
    Bonanomi, S
    Italian National Research Council (CNR), Institute of Marine Biological Resources and Biotechnologies (IRBIM), Largo Fiera della Pesca 1, 60125 Ancona, Italy.
    Boonstra, Wiebren J.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Naturresurser och hållbar utveckling. Stockholm Resilience Centre, Stockholm University, Kräftriket 2B, 11419 Stockholm, Sweden.
    Cornell, G
    School of Geography, University of Melbourne, Bouverie St, Carlton VIC 3053, Australia.
    Cripps, G
    Department for Environment, Food and Rural Affairs, Science and International Affairs, Animal Health and Welfare, 5D, Nobel House, 17 Smith Square, Westminster, SW1P 3JR, UK.
    Danielsen, R
    School of Business, University of Iceland, Gimli v/Sæmundargata, 101 Reykjavík, Iceland.
    Färber, L
    Centre for Ecological and Evolutionary Synthesis (CEES), Department of Biosciences, University of Oslo, PO Box 1066 Blindern, 0316 Oslo, Norway;Institute for Marine Ecosystems and Fishery Science (IMF), Center for Earth System Research and Sustainability (CEN), University of Hamburg, Grosse Elbstrasse 133, 22767, Hamburg, Germany.
    Ferreira, A S A
    Centre for Ecological and Evolutionary Synthesis (CEES), Department of Biosciences, University of Oslo, PO Box 1066 Blindern, 0316 Oslo, Norway;School of Oceanography, University of Washington, Seattle, WA 98195, USA;Department of Mathematics and Statistics, University of Strathclyde, Glasgow, UK.
    Ferguson, K
    Bedford Institute of Oceanography, Fisheries and Oceans, Canada, Box 1006, Dartmouth, N.S. B2Y 4A2, Canada.
    Holma, M
    Department of Economics and Management, University of Helsinki, Latokartanonkaari 5, 00014 University of Helsinki, Finland.
    Holt, R E
    Centre for Ecological and Evolutionary Synthesis (CEES), Department of Biosciences, University of Oslo, PO Box 1066 Blindern, 0316 Oslo, Norway.
    Hunter, K L
    Pacific Biological Station, Fisheries and Oceans, 3190 Hammond Bay Road, Nanaimo, BC V9T 6N7, Canada.
    Kokkalis, A
    National Institute of Aquatic Resources, DTU Aqua, Technical University of Denmark, Kemitorvet, Building 201, 2800 Kgs, Lyngby, Denmark.
    Langbehn, T J
    Department of Biological Sciences, University of Bergen, 5020 Bergen, Norway.
    Ljungström, G
    Department of Biological Sciences, University of Bergen, 5020 Bergen, Norway.
    Nieminen, E
    Finnish Environment Institute (SYKE), Marine Research Centre, Latokartanonkaari 11, 00790 Helsinki, Finland Finland.
    Nordström, M C
    Environmental and Marine Biology, Åbo Akademi University, Artillerigatan 6, 20540 Åbo, Finland.
    Oostdijk, M
    Faculty of Life and Environmental Sciences, University of Iceland, Sturlugötu 7, 101 Reykjavík, Iceland.
    Richter, A
    Centre for Ecological and Evolutionary Synthesis (CEES), Department of Biosciences, University of Oslo, PO Box 1066 Blindern, 0316 Oslo, Norway;Environmental Economics and Natural Resources group, Wageningen University, Wageningen University, P.O. Box 8130, 6700 EW Wageningen, The Netherlands.
    Romagnoni, G
    Centre for Ecological and Evolutionary Synthesis (CEES), Department of Biosciences, University of Oslo, PO Box 1066 Blindern, 0316 Oslo, Norway;COISPA Tecnologia e Ricerca, via dei Trulli 18-20 - 70126 Bari, Italy;Leibniz Centre for Tropical Marine Research (ZMT), Fahrenheitstr. 6 28359 Bremen, Germany.
    Sguotti, C
    Institute for Marine Ecosystems and Fishery Science (IMF), Center for Earth System Research and Sustainability (CEN), University of Hamburg, Grosse Elbstrasse 133, 22767, Hamburg, Germany.
    Simons, A
    Bedford Institute of Oceanography, Fisheries and Oceans, Canada, Box 1006, Dartmouth, N.S. B2Y 4A2, Canada.
    Shackell, N L
    Bedford Institute of Oceanography, Fisheries and Oceans, Canada, Box 1006, Dartmouth, N.S. B2Y 4A2, Canada.
    Snickars, M
    Environmental and Marine Biology, Åbo Akademi University, Artillerigatan 6, 20540 Åbo, Finland.
    Whittington, J D
    Centre for Ecological and Evolutionary Synthesis (CEES), Department of Biosciences, University of Oslo, PO Box 1066 Blindern, 0316 Oslo, Norway.
    Wootton, H
    School of Biosciences, The University of Melbourne, Melbourne, VIC 3010, Australia.
    Yletyinen, J
    Manaaki Whenua Landcare Research, PO Box 69040, Lincoln 7640, New Zealand.
    A review of adaptation options in fisheries management to support resilience and transition under socio-ecological change2021Inngår i: ICES Journal of Marine Science, ISSN 1054-3139, E-ISSN 1095-9289, Vol. 79, nr 2, s. 463-479Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Social-ecological systems dependent on fisheries must be resilient or adapt to remain viable in the face of change. Here, we identified possible interventions (termed “adaptation options”) from published literature, aimed at supporting social or ecological resilience and/or aiding adaptation to changes induced by environmental or social stressors. Our searches centered on nations/regions across North America, Europe, and the South Pacific, encompassing fisheries literature with and without a climate change focus, to compare how, when, and by whom interventions are currently or potentially implemented. We expected that adaptation options within a climate change context would have a greater focus on enhancing social resilience due to a connection with climate change adaptation assessment methodology. Instead, we found a greater focus on ecological resilience, likely indicating a focus on management adaptation. This pattern, along with the more extensive use of social adaptation options responsively and outside the context of climate change, along with an importance in bottom-up influences in implementing them, suggests a general lack of centralized planning and organization with regards to adaptation of stakeholders. Determining how adaptation options are created, chosen, and implemented is a crucial step within or external to ecosystem-based management, especially if planned stakeholder adaption is the goal.

  • 426.
    Yan, Arthur Jiantao
    et al.
    OilChem.
    Xie, Yizhe Daniel
    Asian Development Bank Institute .
    Wachtmeister, Henrik
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Naturresurser och hållbar utveckling.
    Multiple Gas Market Hubs, the People's Republic of China's Energy Security and Regional Cooperation in Asia2019Inngår i: Achieving Energy Security in Asia: Diversification, Integration and Policy Implications / [ed] Farhad Taghizadeh-Hesary, Naoyuki Yoshino, Youngho Chang, and Aladdin D. Rillo, World Scientific, 2019, s. 65-96Kapittel i bok, del av antologi (Fagfellevurdert)
    Abstract [en]

    On March 26, 2018, the People’s Republic of China (PRC) launched Shanghai crude futures as part of its efforts to enhance the region’s energy security. The PRC’s crude futures performed far beyond the market’s expectation in terms of liquidity, volume, and price signal, and thus reignited interest in launching natural gas futures. Any futures of natural gas or liquefied natural gas will be heavily derivatized from efficient benchmark price indexes, which are assessed and reported at the regional market hubs. Instead of having a couple of centralized exchange centers or virtual trading hubs, the web of efficient multiple regional physical and marketing hubs strategically located across the nation would contribute to regional cooperation between the PRC, Japan, and the Republic of Korea; fundamentally change global gas market dynamics; enhance the PRC’s energy security; and support Asian pricing index development. It is the prime time to fast track the establishment of such market hubs in the PRC. We study market participants’ needs and functions of market hubs, identify key success factors of establishing such market hubs, recommend what would make commercially viable and efficient hubs in the PRC in a 14-stage blueprint, and evaluate major policy implications for the PRC, and broadly Asia.

  • 427.
    Yngwe, Fredrika
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Naturresurser och hållbar utveckling.
    State-Owned Enterprise in Sweden Year 2080: Four Governance Prototypes: Creating Transformative Space with Transdisciplinary Climate Fiction Prototyping2022Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    This study explores the potential of transdisciplinary climate fiction prototyping to create a transformative space within state-owned enterprise governance. The approach includes a thematic analysis of governance documents within the portfolio, scenario development, narrative design, participatory sessions with the department of state-owned enterprise, related ministries, and company representatives. The narrative design climate fiction, henceforth Cli-Fi, is used to highlight complexity and create an affectual relationship with the future. The main finding is uncovering a systemic closure constituted by risk aversion that locks in transformative potential of state-owned enterprise governance. The four Cli-Fi prototypes are thus built on narratives driven by different risk behavior that hinder or enable change for sustainability, and are called The Dutiful Widower, The Future Proofers, Winning Vincent, and The Untrusted Trustee. The study concludes that transdisciplinary Cli-Fi prototyping can, and perhaps should, be leveraged to create transformative spaces within organizations and to identify closures and openings for sustainable development.

    Fulltekst (pdf)
    Yngwe, 2022. State-Owned Enterprise in Sweden Year 2080: Four Governance Prototypes - Creating Transformative Space with Transdisciplinary Climate Fiction Prototyping
  • 428.
    Zambars, Agnis
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Naturresurser och hållbar utveckling.
    Recovering energy from excess heat at Gevalia’s roasting-house in Gävle2013Independent thesis Advanced level (professional degree), 20 poäng / 30 hpOppgave
    Abstract [en]

    This thesis examines the roasting process at Gevalia’s coffee roasting house in Gävle and describes the possibilities to recover the energy in roasting gasses that are released into the atmosphere from the factory’s chimneys. The roasting gasses leave the factory’s chimneys at temperatures upwards of 370 °C in large volumes all year round. It is possible to extract energy from them via an economiser. The extracted energy can then be used to replace Gevalia’s consumption of district heating. The estimated potential for energy extracted from the roasting gasses is approximately 10 GWh per year. The monetary gain can be estimated up to 5 million SEK annually if it is possible to sell excess heat into the local district heating grid. It remains uncertain if it is possible to sell the excess heat due to a number of regulations and other external factors. Should this not be possible, the factory can still cover their own heating demand through heat recovery from roasting gasses. An alternative solution to economiser is absorption cooling in order to produce refrigeration. This process, however, is more complicated. There is also a very limited number of cooling consuming elements within the factory. A planned extension of the local district cooling grid in the area could make this a more viable alternative. The estimated potential for cooling production is approximately 7,6 GWh per year.

    Fulltekst (pdf)
    fulltext
  • 429.
    Zeng, Yeli
    et al.
    China University of Petroleum.
    Dong, Cong
    University of International Business and Economics.
    Höök, Mikael
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Naturresurser och hållbar utveckling.
    Sun, Jinhua
    Petro China International Co..
    Shi, Danyang
    China University of Petroleum.
    Can the Shanghai LNG Price Index indicate Chinese market?: An econometric investigation using price discovery theory2020Inngår i: Frontiers in Energy, ISSN 2095-1701, E-ISSN 2095-1698, Vol. 14, nr 4, s. 726-739Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    China became the world’s second largest liquefied natural gas (LNG) importer in 2018 but has faced extremely high import costs due to a lack of bargaining power. Assessments of the Shanghai LNG Price Index, first released in 2015, are vital for improving the understanding of these cost dynamics. This paper, using the LNG price index data from the Shanghai Petroleum and Gas Exchange (SHPGX) coupled with domestic and international LNG prices from July 1, 2015 to December 31, 2018, estimates several econometric models to evaluate the long-term and short-term equilibriums of the Shanghai LNG Price Index, the responses to market information shocks and the leading or lagging relationships with LNG and alternative energy prices from other agencies. The results show that the LNG price index of the SHPGX has already exhibited a long-term equilibrium and short-term adjustment mechanisms to reflect the average price level and market movements, but the market information transparency and price discovery efficiency of the index are still inadequate. China’s LNG market is still relatively independent of other natural gas markets, and marketization reforms are under way in China. The influence of the SHPGX LNG price index on the trading decisions of market participants is expected to improve with further development of China’s LNG reforms, the formation of a natural gas entry-exit system, and the increasing liquidity of the hub.

  • 430.
    zu Ermgassen, Philine S. E.
    et al.
    Univ Edinburgh, Sch Geosci, Grant Inst, Changing Oceans Grp, Kings Bldg, Edinburgh EH9 3FE, Midlothian, Scotland..
    Mukherjee, Nibedita
    Univ Cambridge, Dept Zool, David Attenborough Bldg,Pembroke St, Cambridge CB2 3QZ, England..
    Worthington, Thomas A.
    Univ Cambridge, Dept Zool, David Attenborough Bldg,Pembroke St, Cambridge CB2 3QZ, England..
    Acosta, Alejandro
    Fish & Wildlife Res Inst, Florida Fish & Wildlife Conservat Commiss, 2796 Overseas Hwy, Marathon, FL 33050 USA..
    da Rocha Araujo, Ana Rosa
    Univ Fed Sergipe, Dept Fishery Engn & Aquaculture, Sao Cristovao, Brazil..
    Beitl, Christine M.
    Univ Maine, Dept Anthropol, 5773 S Stevens Hall,228A, Orono, ME 04469 USA..
    Castellanos-Galindo, Gustavo A.
    Smithsonian Trop Res Inst STRI, Panama City, Panama.;Leibniz Ctr Trop Marine Res ZMT, Bremen, Germany.;Ctr Trop Marine Res ZMT, Fahrenheitstr 6, D-28358 Bremen, Germany..
    Cunha-Lignon, Marilia
    Univ Estadual Paulista UNESP, Dept Fishery Engn, Campus Registro, BR-1190000 Registro, SP, Brazil..
    Dahdouh-Guebas, Farid
    Univ Libre Bruxelles ULB, Dept Biol Organismes, Lab Syst Ecol & Resource Management, Av FD Roosevelt 50,CPi 264-1, B-1050 Brussels, Belgium.;Vrije Univ Brussel VUB, Biol Dept, Lab Plant Biol & Nat Management, Ecol & Biodivers, Pl Laan 2, B-1050 Brussels, Belgium..
    Diele, Karen
    Edinburgh Napier Univ, Sch Appl Sci, Edinburgh EH11 4BN, Midlothian, Scotland..
    Parrett, Cara L.
    Univ Cambridge, Dept Engn, Cambridge, England..
    Dwyer, Patrick G.
    DPI Fisheries, Coastal Syst, 1243 Bruxner Hwy, Wollongbar, NSW 2477, Australia..
    Gair, Jonathan R.
    Univ Edinburgh, Sch Math, Kings Bldg,Peter Guthrie Tait Rd, Edinburgh EH9 3FD, Midlothian, Scotland..
    Johnson, Andrew Frederick
    MarFishEco Fisheries Consultants, 3 F9 Antigua St, Edinburgh EH1 3NH, Midlothian, Scotland.;Heriot Watt Univ, Lyell Ctr, Sch Energy Geosci Infrastruct & Soc, Inst Life & Earth Sci, Edinburgh EH14 4AS, Midlothian, Scotland..
    Kuguru, Baraka
    Tanzania Fisheries Res Inst, POB 9750, Dar Es Salaam, Tanzania..
    Lobo, Aaron Savio
    IUCN SSC Marine Conservat Comm, Colombo, Sri Lanka..
    Loneragan, Neil R.
    Murdoch Univ, Coll SHEE & Harry Butler Inst, Environm & Conservat Sci, South St, Murdoch, WA 6150, Australia..
    Longley-Wood, Kate
    Nature Conservancy, 1815 N Lynn St, Arlington, VA USA..
    Mendonca, Jocemar Tomasino
    Inst Pesca, Nucleo Pesquisa Litoral Sul, Av Besnard S-N, BR-11990000 Cananeia, SP, Brazil..
    Meynecke, Jan-Olaf
    Griffith Univ, Griffith Ctr Coastal Management & Australian Rive, Gold Coast, Qld 4222, Australia..
    Mandal, Roland Nathan
    Ctr Environm & Geog Informat Serv, Agr & Fisheries Div, Dhaka, Bangladesh..
    Munga, Cosmas Nzaka
    Univ Witwatersrand, Sch Geog, Dept Geog & Environm Studies, ZA-2050 Johannesburg, South Africa.;Tech Univ Mombasa, Dept Environm & Hlth Sci, Marine & Fisheries Program, POB 90420, Mombasa 80100, Kenya..
    Reguero, Borja G.
    Univ Calif Santa Cruz, Inst Marine Sci, 115 McAllister Way, Santa Cruz, CA 95064 USA..
    Rönnbäck, Patrik
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Naturresurser och hållbar utveckling.
    Thorley, Julia
    GIS Consultant, Penzance, Cornwall, England..
    Wolff, Matthias
    Ctr Trop Marine Res ZMT, Fahrenheitstr 6, D-28358 Bremen, Germany..
    Spalding, Mark
    Univ Cambridge, Dept Zool, David Attenborough Bldg,Pembroke St, Cambridge CB2 3QZ, England.;Univ Siena, Dept Phys Earth & Environm Sci, Nat Conservancy, I-53100 Siena, Italy..
    Fishers who rely on mangroves: Modelling and mapping the global intensity of mangrove-associated fisheries2020Inngår i: Estuarine, Coastal and Shelf Science, ISSN 0272-7714, E-ISSN 1096-0015, Vol. 247, artikkel-id 106975Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Mangroves are critical nursery habitats for fish and invertebrates, providing livelihoods for many coastal communities. Despite their importance, there is currently no estimate of the number of fishers engaged in mangrove associated fisheries, nor of the fishing intensity associated with mangroves at a global scale. We address these gaps by developing a global model of mangrove associated fisher numbers and mangrove fishing intensity. To develop the model, we undertook a three-round Delphi process with mangrove fisheries experts to identify the key drivers of mangrove fishing intensity. We then developed a conceptual model of intensity of mangrove fishing using those factors identified both as being important and for which appropriate global data could be found or developed. These factors were non-urban population, distance to market, distance to mangroves and other fishing grounds, and storm events. By projecting this conceptual model using geospatial data sets, we were able to estimate the number and distribution of mangrove associated fishers and the intensity of fishing in mangroves. We estimate there are 4.1 million mangrove associated fishers globally, with the highest number of mangrove fishers found in Indonesia, India, Bangladesh, Myanmar, and Brazil. Mangrove fishing intensity was greatest throughout Asia, and to a lesser extent West and Central Africa, and Central and South America.

    Fulltekst (pdf)
    fulltext
  • 431.
    Žilinskaitė, Emilija
    et al.
    Swedish Univ Agr Sci, Dept Aquat Sci & Assessment, S-75007 Uppsala, Sweden..
    Blicharska, Malgorzata
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Naturresurser och hållbar utveckling.
    Futter, Martyn
    Swedish Univ Agr Sci, Dept Aquat Sci & Assessment, S-75007 Uppsala, Sweden..
    Stakeholder Perspectives on Blue Mussel Farming to Mitigate Baltic Sea Eutrophication2021Inngår i: Sustainability, E-ISSN 2071-1050, Vol. 13, nr 16, artikkel-id 9180Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Here, we present an application of systems thinking to controlling Baltic Sea eutrophication-a wicked environmental problem characterized by multiple stakeholder perspectives and no single, agreed upon solution. The Baltic Sea is one of the most polluted waterbodies in the world. More than 40 years of land-based (linear) measures have failed to adequately control eutrophication, yet internal (circular) measures are rarely used. Farming native blue mussels for nutrient capture has been proposed as one measure for eutrophication control, but the relevant stakeholders disagree as to its environmental, social and economic benefits. Here, we present the views of four Swedish stakeholder groups-academics, entrepreneurs, municipal government employees and representatives of non-governmental organizations (NGOs)-on the sustainability of native blue mussel farming, a circular measure for eutrophication control. Using semi-structured interviews, we elicited stakeholder perspectives on the environmental, economic and social dimensions of blue mussel farming. The interviewees generally agreed that blue mussel farming is not currently economically sustainable, but that it can contribute to the social sustainability of coastal regions. Academics were skeptical of the environmental benefits, claiming that farms could reinforce eutrophication, whereas the remaining stakeholder groups argued for its potential to mitigate eutrophication. In a roundtable discussion conducted one year after the original interviews, all stakeholder groups agreed that blue mussel farming alone will not fix Baltic Sea eutrophication, but can be part of the solution together with land-based measures. All groups also agreed on the need for cautious upscaling, continuous environmental monitoring and constant improvement if blue mussel farms are to be part of a "toolkit" for eutrophication control. Our results highlight the fact that wicked environmental problems can be addressed when multiple stakeholder groups with differing perspectives have the opportunity to achieve consensus through dialog.

    Fulltekst (pdf)
    fulltext
6789 401 - 431 of 431
RefereraExporteraLink til resultatlisten
Permanent link
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf