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  • 1. Albani, S
    et al.
    Mahowald, N M
    Winckler, G
    Anderson, R F
    Bradtmiller, L I
    Delmonte, B
    François, R
    Goman, M
    Heavens, N G
    Hesse, P P
    Hovan, S A
    Kang, S G
    Kohfeld, K E
    Lu, H
    Maggi, V
    Mason, A
    Mayewski, P A
    McGee, D
    Miao, X
    Otto-Bliesner, L
    Perry, A T
    Pourmand, A
    Roberts, H M
    Rosenbloom, N
    Stevens, Thomas
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Luft-, vatten och landskapslära.
    Sun, J
    Twelve thousand years of dust: the Holocene global dust cycle constrained by natural archives2015Inngår i: Climate of the Past, ISSN 1814-9324, E-ISSN 1814-9332, Vol. 11, nr 6, s. 869-903Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Mineral dust plays an important role in the climate system by interacting with radiation, clouds, and biogeochemical cycles. In addition, natural archives show that the dust cycle experienced variability in the past in response to global and local climate change. The compilation of the DIRTMAP paleodust datasets in the last two decades provided a target for paleoclimate models that include the dust cycle, following a time slice approach. We propose an innovative framework to organize a paleodust dataset that moves on from the positive experience of DIRTMAP and takes into account new scientific challenges, by providing a concise and accessible dataset of temporally resolved records of dust mass accumulation rates and particle grain-size distributions. We consider data from ice cores, marine sediments, loess/paleosol sequences, lake sediments, and peat bogs for this compilation, with a temporal focus on the Holocene period. This global compilation allows investigation of the potential, uncertainties and confidence level of dust mass accumulation rates reconstructions, and highlights the importance of dust particle size information for accurate and quantitative reconstructions of the dust cycle. After applying criteria that help to establish that the data considered represent changes in dust deposition, 43 paleodust records have been identified, with the highest density of dust deposition data occurring in the North Atlantic region. Although the temporal evolution of dust in the North Atlantic appears consistent across several cores and suggest that minimum dust fluxes are likely observed during the Early to mid-Holocene period (6000–8000 years ago), the magnitude of dust fluxes in these observations is not fully consistent, suggesting that more work needs to be done to synthesize datasets for the Holocene. Based on the data compilation, we used the Community Earth System Model to estimate the mass balance and variability of the global dust cycle during the Holocene, with dust load ranging from 17.1 to 20.5 Tg between 2000 and 10 000 years ago, and a minimum in the Early to Mid-Holocene (6000–8000 years ago).

  • 2.
    Bini, Monica
    et al.
    Univ Pisa, Dipartimento Sci Terra, Pisa, Italy.
    Zanchetta, Giovanni
    Univ Pisa, Dipartimento Sci Terra, Pisa, Italy.
    Persoiu, Aurel
    Romanian Acad, Emil Racovita Inst Speleol, Cluj Napoca, Romania.
    Cartier, Rosine
    Lund Univ, Dept Geol, Quaternary Sci, Lund, Sweden.
    Catala, Albert
    Univ Barcelona, Fac Geol, GRC Geociencies Marines, Dept Dinam Terra & Ocea, Barcelona, Spain.
    Cacho, Isabel
    Univ Barcelona, Fac Geol, GRC Geociencies Marines, Dept Dinam Terra & Ocea, Barcelona, Spain.
    Dean, Jonathan R.
    Univ Hull, Sch Environm Sci, Kingston Upon Hull, N Humberside, England.
    Di Rita, Federico
    Univ Roma La Sapienza, Dipartimento Biol Ambientale, Rome, Italy.
    Drysdale, Russell N.
    Univ Melbourne, Sch Geog, Melbourne, Vic, Australia.
    Finné, Martin
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Historisk-filosofiska fakulteten, Institutionen för arkeologi och antik historia, Antikens kultur och samhällsliv. Stockholm Univ, Dept Phys Geog, Stockholm, Sweden.
    Isola, Ilaria
    Ist Nazl Geofis & Vulcanol, Sez Pisa, Pisa, Italy.
    Jalali, Bassem
    Univ Paris 06, Sorbonne Univ, LOCEAN Lab, CNRS,IRD,MNHN,UPMC, Paris, France.
    Lirer, Fabrizio
    CNR Napoli, Ist Sci Marine ISMAR, Naples, Italy.
    Magri, Donatella
    Univ Roma La Sapienza, Dipartimento Biol Ambientale, Rome, Italy.
    Masi, Alessia
    Univ Roma La Sapienza, Dipartimento Biol Ambientale, Rome, Italy.
    Marks, Leszek
    Univ Warsaw, Fac Geol, Warsaw, Poland.
    Mercuri, Anna Maria
    Univ Reggio Emilia & Modena, Dipartimento Sci Vita, Modena, Italy.
    Peyron, Odile
    Univ Montpellier, Inst Sci Evolut ISEM, Montpellier, France.
    Sadori, Laura
    Univ Roma La Sapienza, Dipartimento Biol Ambientale, Rome, Italy.
    Sicre, Marie-Alexandrine
    Univ Paris 06, Sorbonne Univ, LOCEAN Lab, CNRS,IRD,MNHN,UPMC, Paris, France.
    Welc, Fabian
    Cardinal Stefan Wyszynski Univ, Inst Archaeol, Warsaw, Poland.
    Zielhofer, Christoph
    Univ Leipzig, Chair Phys Geog, Leipzig, Germany.
    Brisset, Elodie
    Inst Catala Paleoecol Humana & Evolucio Social, IPHES, Tarragona, Spain;Univ Rovira & Virgili, Area Prehist, Tarragona, Spain.
    The 4.2 ka BP Event in the Mediterranean region: an overview2019Inngår i: Climate of the Past, ISSN 1814-9324, E-ISSN 1814-9332, Vol. 15, nr 2, s. 555-577Artikkel, forskningsoversikt (Fagfellevurdert)
    Abstract [en]

    The Mediterranean region and the Levant have returned some of the clearest evidence of a climatically dry period occurring around 4200 years ago. However, some regional evidence is controversial and contradictory, and issues remain regarding timing, progression, and regional articulation of this event. In this paper, we review the evidence from selected proxies (sea-surface temperature, precipitation, and temperature reconstructed from pollen, delta O-18 on speleothems, and delta O-18 on lacustrine carbonate) over the Mediterranean Basin to infer possible regional climate patterns during the interval between 4.3 and 3.8 ka. The values and limitations of these proxies are discussed, and their potential for furnishing information on seasonality is also explored. Despite the chronological uncertainties, which are the main limitations for disentangling details of the climatic conditions, the data suggest that winter over the Mediterranean involved drier conditions, in addition to already dry summers. However, some exceptions to this prevail - where wetter conditions seem to have persisted - suggesting regional heterogeneity in climate patterns. Temperature data, even if sparse, also suggest a cooling anomaly, even if this is not uniform. The most common paradigm to interpret the precipitation regime in the Mediterranean - a North Atlantic Oscillation-like pattern - is not completely satisfactory to interpret the selected data.

  • 3.
    Bordiga, Manuela
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Paleobiologi.
    Henderiks, Jorijntje
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Paleobiologi.
    Tori, F.
    Univ Florence, Dipartimento Sci Terra, I-50121 Florence, Italy..
    Monechi, S.
    Univ Florence, Dipartimento Sci Terra, I-50121 Florence, Italy..
    Fenero, R.
    Univ Zaragoza, Dept Ciencias Tierra, E-50009 Zaragoza, Spain.;Univ Zaragoza, Inst Univ Invest Ciencias Ambientales Aragon, E-50009 Zaragoza, Spain..
    Legarda-Lisarri, A.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Paleobiologi. Univ Zaragoza, Dept Ciencias Tierra, E-50009 Zaragoza, Spain.;Univ Zaragoza, Inst Univ Invest Ciencias Ambientales Aragon, E-50009 Zaragoza, Spain..
    Thomas, E.
    Yale Univ, Dept Geol & Geophys, New Haven, CT 06520 USA.;Wesleyan Univ, Dept Earth & Environm Sci, Middletown, CT 06459 USA..
    Microfossil evidence for trophic changes during the Eocene-Oligocene transition in the South Atlantic (ODP Site 1263, Walvis Ridge)2015Inngår i: Climate of the Past, ISSN 1814-9324, E-ISSN 1814-9332, Vol. 11, nr 9, s. 1249-1270Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The biotic response of calcareous nannoplankton to environmental and climatic changes during the Eocene-Oligocene transition was investigated at a high resolution at Ocean Drilling Program (ODP) Site 1263 (Walvis Ridge, southeast Atlantic Ocean) and compared with a lower-resolution benthic foraminiferal record. During this time interval, global climate, which had been warm under high levels of atmospheric CO2 (pCO(2)) during the Eocene, transitioned into the cooler climate of the Oligocene, at overall lower pCO(2). At Site 1263, the absolute nannofossil abundance (coccoliths per gram of sediment; N g(-1)) and the mean coccolith size decreased distinctly after the E-O boundary (EOB; 33.89 Ma), mainly due to a sharp decline in abundance of large-sized Reticulofenestra and Dictyococcites, occurring within a time span of similar to 47 kyr. Carbonate dissolution did not vary much across the EOB; thus, the decrease in abundance and size of nannofossils may reflect an overall decrease in their export production, which could have led to variations in the food availability for benthic foraminifers. The benthic foraminiferal assemblage data are consistent with a global decline in abundance of rectilinear species with complex apertures in the latest Eocene (similar to 34.5 Ma), potentially reflecting changes in the food source, i.e., phytoplankton. This was followed by a transient increased abundance of species indicative of seasonal delivery of food to the sea floor (Epistominella spp.; similar to 33.9-33.4 Ma), with a short peak in overall food delivery at the EOB (buliminid taxa; similar to 33.8 Ma). Increased abundance of Nuttallides umbonifera (at similar to 33.3 Ma) indicates the presence of more corrosive bottom waters and possibly the combined arrival of less food at the sea floor after the second step of cooling (Step 2). The most important changes in the calcareous nannofossil and benthic communities occurred similar to 120 kyr after the EOB. There was no major change in nannofossil abundance or assemblage composition at Site 1263 after Step 2 although benthic foraminifera indicate more corrosive bottom waters during this time. During the onset of latest-Eocene-earliest-Oligocene climate change, marine phytoplankton thus showed high sensitivity to fast-changing conditions as well as to a possibly enhanced, pulsed nutrient supply and to the crossing of a climatic threshold (e.g., pCO(2) decline, high-latitude cooling and changes in ocean circulation).

  • 4.
    Brugnara, Y.
    et al.
    Oeschger Ctr Climate Change Res, Bern, Switzerland.;Univ Bern, Inst Geophys, Bern, Switzerland..
    Auchmann, R.
    Oeschger Ctr Climate Change Res, Bern, Switzerland.;Univ Bern, Inst Geophys, Bern, Switzerland..
    Broennimann, S.
    Oeschger Ctr Climate Change Res, Bern, Switzerland.;Univ Bern, Inst Geophys, Bern, Switzerland..
    Allan, R. J.
    Met Off, Hadley Ctr, Exeter, Devon, England..
    Auer, I.
    ZAMG, Cent Inst Meteorol & Geodynam, Vienna, Austria..
    Barriendos, M.
    Univ Barcelona, Dept Modern Hist, Barcelona, Spain..
    Bergström, H.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Luft-, vatten och landskapslära. Uppsala Univ, Dept Earth Sci, Uppsala, Sweden..
    Bhend, J.
    MeteoSwiss, Fed Off Meteorol & Climatol, Zurich, Switzerland..
    Brazdil, R.
    Masaryk Univ, Inst Geog, Brno, Czech Republic.;Acad Sci Czech Republic, Global Change Res Ctr, Brno, Czech Republic..
    Compo, G. P.
    Univ Colorado, Cooperat Inst Res Environm Sci, Div Phys Sci, Earth Syst Res Lab,Natl Ocean & Atmospher Adm, Boulder, CO 80309 USA..
    Cornes, R. C.
    Univ E Anglia, CRU, Sch Environm Sci, Norwich NR4 7TJ, Norfolk, England..
    Dominguez-Castro, F.
    Univ Extremadura, Dept Phys, Badajoz, Spain.;Escuela Politec Nacl, Dept Ingn Civil & Ambiental, Quito, Ecuador..
    van Engelen, A. F. V.
    Royal Netherlands Meteorol Inst, KNMI, NL-3730 AE De Bilt, Netherlands..
    Filipiak, J.
    Univ Gdansk, Inst Geog, PL-80952 Gdansk, Poland..
    Holopainen, J.
    Univ Helsinki, Dept Geosci & Geog, Helsinki, Finland..
    Jourdain, S.
    Meteo France, Direct Climatol, Toulouse, France..
    Kunz, M.
    Karlsruhe Inst Technol, Inst Meteorol & Climate Res IMK, D-76021 Karlsruhe, Germany..
    Luterbacher, J.
    Univ Giessen, Dept Geog Climatol Climate Dynam & Climat, D-35390 Giessen, Germany..
    Maugeri, M.
    Univ Milan, Dept Phys, Milan, Italy..
    Mercalli, L.
    SMI, Turin, Italy..
    Moberg, A.
    Stockholm Univ, Dept Phys Geog, S-10691 Stockholm, Sweden.;Stockholm Univ, Bolin Ctr Climate Res, S-10691 Stockholm, Sweden..
    Mock, C. J.
    Univ S Carolina, Dept Geog, Columbia, SC 29208 USA..
    Pichard, G.
    Univ Aix Marseille, Dept Hist, Marseille, Aix En Provence, France..
    Reznckova, L.
    Masaryk Univ, Inst Geog, Brno, Czech Republic.;Acad Sci Czech Republic, Global Change Res Ctr, Brno, Czech Republic..
    van der Schrier, G.
    Royal Netherlands Meteorol Inst, KNMI, NL-3730 AE De Bilt, Netherlands..
    Slonosky, V.
    McGill Univ, Ctr Interdisciplinary Studies Montreal, Montreal, PQ, Canada..
    Ustrnul, Z.
    Jagiellonian Univ, Dept Climatol, Krakow, Poland..
    Valente, M. A.
    Univ Lisbon, Inst Dom Luiz, Fac Ciencias, P-1699 Lisbon, Portugal..
    Wypych, A.
    Jagiellonian Univ, Dept Climatol, Krakow, Poland..
    Yin, X.
    ERT Inc, Asheville, NC USA..
    A collection of sub-daily pressure and temperature observations for the early instrumental period with a focus on the "year without a summer" 18162015Inngår i: Climate of the Past, ISSN 1814-9324, E-ISSN 1814-9332, Vol. 11, nr 8, s. 1027-1047Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The eruption of Mount Tambora (Indonesia) in April 1815 is the largest documented volcanic eruption in history. It is associated with a large global cooling during the following year, felt particularly in parts of Europe and North America, where the year 1816 became known as the "year without a summer". This paper describes an effort made to collect surface meteorological observations from the early instrumental period, with a focus on the years of and immediately following the eruption (1815-1817). Although the collection aimed in particular at pressure observations, correspondent temperature observations were also recovered. Some of the series had already been described in the literature, but a large part of the data, recently digitised from original weather diaries and contemporary magazines and newspapers, is presented here for the first time. The collection puts together more than 50 sub-daily series from land observatories in Europe and North America and from ships in the tropics. The pressure observations have been corrected for temperature and gravity and reduced to mean sea level. Moreover, an additional statistical correction was applied to take into account common error sources in mercury barometers. To assess the reliability of the corrected data set, the variance in the pressure observations is compared with modern climatologies, and single observations are used for synoptic analyses of three case studies in Europe. All raw observations will be made available to the scientific community in the International Surface Pressure Databank.

  • 5.
    Comas-Bru, Laia
    et al.
    Univ Reading, Sch Archaeol Geog & Environm Sci, Reading RG6 6AH, Berks, England;Univ Coll Dublin, Sch Earth Sci, Dublin 4, Ireland.
    Harrison, Sandy P.
    Univ Reading, Sch Archaeol Geog & Environm Sci, Reading RG6 6AH, Berks, England.
    Werner, Martin
    Helmholtz Ctr Polar & Marine Res, Alfred Wegener Inst, Climate Sci Div, Div Climate Sci Paleoclimate Dynam, Bussestr 24, D-27570 Bremerhaven, Germany.
    Rehfeld, Kira
    Heidelberg Univ, Inst Environm Phys, Neuenheimer Feld 229, D-69120 Heidelberg, Germany.
    Scroxton, Nick
    Univ Massachusetts, Dept Geosci, 611 North Pleasant St, Amherst, MA 01003 USA.
    Veiga-Pires, Cristina
    Univ Algarve, Marine & Environm Res Ctr CIMA, Campus Gambelas, P-8005139 Faro, Portugal.
    Ahmad, Syed Masood
    Jamia Millia Islamia, Fac Nat Sci, Dept Geog, New Delhi 110025, India.
    Brahim, Yassine Ait
    Xi An Jiao Tong Univ, Inst Global Environm Change, Xian, Shaanxi, Peoples R China.
    Mozhdehi, Sahar Amirnezhad
    Univ Coll Dublin, Sch Earth Sci, Dublin 4, Ireland.
    Arienzo, Monica
    Desert Res Inst, Div Hydrol Sci, 2215 Raggio Pkwy, Reno, NV 89512 USA.
    Atsawawaranunt, Kamolphat
    Univ Reading, Sch Archaeol Geog & Environm Sci, Reading RG6 6AH, Berks, England.
    Baker, Andy
    Univ New South Wales, Sch Biol Earth & Environm Sci, Kensington, NSW 2052, Australia.
    Braun, Kerstin
    Arizona State Univ, Inst Human Origins, POB 874101, Tempe, AZ 85287 USA.
    Breitenbach, Sebastian
    Ruhr Univ Bochum, Inst Geol Mineral & Geophys, Sediment & Isotope Geol, Univ Str 150,IA E5-179, D-44801 Bochum, Germany.
    Burstyn, Yuval
    Geol Survey Israel, 32 Yeshayahu Leibowitz, IL-9371234 Jerusalem, Israel;Hebrew Univ Jerusalem, Inst Earth Sci, Edmond J Safra Campus, IL-91904 Jerusalem, Israel.
    Chawchai, Sakonvan
    Chulalongkorn Univ, Fac Sci, Dept Geol, MESA Res Unit, 254 Phayathai Rd, Bangkok 10330, Thailand.
    Columbu, Andrea
    Dept Biol Geol & Environm Sci, Via Zamboni 67, I-40126 Bologna, Italy.
    Deininger, Michael
    Johannes Gutenberg Univ Mainz, Inst Geosci, Johann Joachim Becher Weg 21, D-55128 Mainz, Germany.
    Demeny, Attila
    Hungarian Acad Sci, Res Ctr Astron & Earth Sci, Inst Geol & Geochem Res, Budaorsi Ut 45, H-1112 Budapest, Hungary.
    Dixon, Bronwyn
    Univ Reading, Sch Archaeol Geog & Environm Sci, Reading RG6 6AH, Berks, England;Univ Melbourne, Sch Geog, Melbourne, Vic 3010, Australia.
    Hatvani, Istvan Gabor
    Hungarian Acad Sci, Res Ctr Astron & Earth Sci, Inst Geol & Geochem Res, Budaorsi Ut 45, H-1112 Budapest, Hungary.
    Hu, Jun
    Univ Southern Calif, Dept Earth Sci, 3651 Trousdale Pkwy, Los Angeles, CA 90089 USA.
    Kaushal, Nikita
    Univ Oxford, Dept Earth Sci, South Parks Rd, Oxford OX1 3AN, England.
    Kern, Zoltan
    Hungarian Acad Sci, Res Ctr Astron & Earth Sci, Inst Geol & Geochem Res, Budaorsi Ut 45, H-1112 Budapest, Hungary.
    Labuhn, Inga
    Univ Bremen, Inst Geog, Celsiusstr 2, D-28359 Bremen, Germany.
    Lachniet, Matthew S.
    Univ Nevada, Dept Geosci, POB 4022, Las Vegas, NV 89154 USA.
    Lechleitner, Franziska A.
    Univ Oxford, Dept Earth Sci, South Parks Rd, Oxford OX1 3AN, England.
    Lorrey, Andrew
    Natl Inst Water & Atmospher Res, Climate Atmosphere & Hazards Ctr, 41 Market Pl, Auckland, New Zealand.
    Markowska, Monika
    Univ Tubingen, Holderlinstr 12, D-72074 Tubingen, Germany.
    Nehme, Carole
    Univ Rouen Normandie, IDEES UMR CNRS 6266, Dept Geog, Mont St Aignan, France.
    Novello, Valdir F.
    Univ Sao Paulo, Inst Geociencias, Sao Paulo, Brazil.
    Oster, Jessica
    Vanderbilt Univ, Dept Earth & Environm Sci, Nashville, TN 37206 USA.
    Perez-Mejias, Carlos
    Xi An Jiao Tong Univ, Inst Global Environm Change, Xian, Shaanxi, Peoples R China;Pyrenean Inst Ecol IPE CSIC, Dept Geoenvironm Proc & Global Change, Ave Montanana 1005, Zaragoza 50059, Spain.
    Pickering, Robyn
    South Africa & Human Evolut Res Inst, Dept Geol Sci, Cape Town, South Africa.
    Sekhon, Natasha
    Univ Texas Austin, Jackson Sch Geosci, Dept Geol Sci, Austin, TX 78712 USA.
    Wang, Xianfeng
    Nanyang Technol Univ, Earth Observ Singapore, Singapore 636798, Singapore.
    Warken, Sophie
    Heidelberg Univ, Inst Environm Phys, Neuenheimer Feld 229, D-69120 Heidelberg, Germany.
    Atkinson, Tim
    UCL, Dept Earth Sci, London WC1E 6BT, England;UCL, Dept Geog, London WC1E 6BT, England.
    Ayalon, Avner
    Geol Survey Israel, 32 Yeshayahu Leibowitz, IL-9371234 Jerusalem, Israel.
    Baldini, James
    Univ Durham, Dept Earth Sci, Durham DH1 3LE, England.
    Bar-Matthews, Miryam
    Geol Survey Israel, 32 Yeshayahu Leibowitz, IL-9371234 Jerusalem, Israel.
    Bernal, Juan Pablo
    Univ Nacl Autonoma Mexico, Ctr Geociencias, Campus UNAM Juriquilla, Queretaro 76230, Queretaro, Mexico.
    Boch, Ronny
    Graz Univ Technol, Inst Appl Geosci, Rechbauerstr 12, A-8010 Graz, Austria.
    Borsato, Andrea
    Univ Newcastle, Sch Environm & Life Sci, Callaghan, NSW 2308, Australia.
    Boyd, Meighan
    Royal Holloway Univ London, Dept Earth Sci, Egham TW20 0EX, Surrey, England.
    Brierley, Chris
    UCL, Dept Geog, London WC1E 6BT, England.
    Cai, Yanjun
    Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710061, Shaanxi, Peoples R China.
    Carolin, Stacy
    Univ Innsbruck, Inst Geol, Innrain 52, A-6020 Innsbruck, Austria.
    Cheng, Hai
    Xi An Jiao Tong Univ, Inst Global Environm Change, Xian, Shaanxi, Peoples R China.
    Constantin, Silviu
    Emil Racovita Inst Speleol, Str Frumoasa 31, Bucharest, Romania.
    Couchoud, Isabelle
    Univ Grenoble Alpes, Univ Savoie Mt Blanc, EDYTEM, UMR CNRS 5204, F-73370 Le Bourget Du Lac, France.
    Cruz, Francisco
    Univ Sao Paulo, Inst Geociencias, Sao Paulo, Brazil.
    Denniston, Rhawn
    Cornell Coll, Dept Geol, Mt Vernon, IA 52314 USA.
    Dragusin, Virgil
    Emil Racovita Inst Speleol, Str Frumoasa 31, Bucharest, Romania.
    Duan, Wuhui
    Chinese Acad Sci, Inst Geol & Geophys, Key Lab Cenozo Geol & Environm, Beijing 100029, Peoples R China.
    Ersek, Vasile
    Northumbria Univ, Dept Geog & Environm Sci, Newcastle Upon Tyne, Tyne & Wear, England.
    Finné, Martin
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Historisk-filosofiska fakulteten, Institutionen för arkeologi och antik historia, Antikens kultur och samhällsliv.
    Fleitmann, Dominik
    Univ Reading, Sch Archaeol Geog & Environm Sci, Dept Archaeol, Reading RG6 6AB, Berks, England.
    Fohlmeister, Jens
    Univ Potsdam, Inst Earth & Environm Sci, Karl Liebknecht Str 24-25, D-14476 Potsdam, Germany.
    Frappier, Amy
    Skidmore Coll, Dept Geosci, Saratoga Springs, NY 12866 USA.
    Genty, Dominique
    CNRS, Lab Sci Climat & Environm, F-91191 Gif Sur Yvette, France.
    Holzkamper, Steffen
    Stockholm Univ, Dept Phys Geog, S-10691 Stockholm, Sweden.
    Hopley, Philip
    Birkbeck Univ London, Dept Earth & Planetary Sci, Malet St, London WC1E 7HX, England.
    Johnston, Vanessa
    Slovenian Acad Sci & Arts, Res Ctr, Karst Res Inst, Titov Trg 2, Postojna 6230, Slovenia.
    Kathayat, Gayatri
    Xi An Jiao Tong Univ, Inst Global Environm Change, Xian, Shaanxi, Peoples R China.
    Keenan-Jones, Duncan
    Univ Queensland, Sch Hist & Philosoph Inquiry, St Lucia, Qld 4072, Australia.
    Koltai, Gabriella
    Univ Innsbruck, Inst Geol, Innrain 52, A-6020 Innsbruck, Austria.
    Li, Ting-Yong
    Southwest Univ, Sch Geog Sci, Chongqing Key Lab Karst Environm, Chongqing 400715, Peoples R China;Minist Nat Resources China, Field Sci Observat & Res Base Karst Ecoenvironm N, Chongqing 408435, Peoples R China.
    Lone, Mahjoor Ahmad
    Natl Taiwan Univ, Dept Geosci, High Precis Mass Spectrometry & Environm Change L, Taipei 10617, Taiwan;Natl Taiwan Univ, Res Ctr Future Earth, Taipei 10617, Taiwan.
    Luetscher, Marc
    Swiss Inst Speleol & Karst Studies SISKA, Rue Serre 68, CH-2301 La Chaux De Fonds, Switzerland.
    Mattey, Dave
    Royal Holloway Univ London, Dept Earth Sci, Egham TW20 0EX, Surrey, England.
    Moreno, Ana
    Inst Pirena Ecol CSIC, Dept Proc Geoambientales & Cambio Global, Zaragoza, Spain.
    Moseley, Gina
    Univ Innsbruck, Inst Geol, Innrain 52, A-6020 Innsbruck, Austria.
    Psomiadis, David
    Imprint Analyt GmbH, Werner von Siemens Str 1, A-7343 Neutal, Austria.
    Ruan, Jiaoyang
    Sun Yat Sen Univ, Sch Earth Sci & Engn, Guangdong Prov Key Lab Geodynam & Geohazards, Guangzhou 510275, Guangdong, Peoples R China.
    Scholz, Denis
    Johannes Gutenberg Univ Mainz, Inst Geosci, Johann Joachim Becher Weg 21, D-55128 Mainz, Germany.
    Sha, Lijuan
    Xi An Jiao Tong Univ, Inst Global Environm Change, Xian, Shaanxi, Peoples R China.
    Smith, Andrew Christopher
    British Geol Survey, NERC Isotope Geosci Facil, Nottingham, England.
    Strikis, Nicolas
    Univ Fed Fluminense, Dept Geoquim, Niteroi, RJ, Brazil.
    Treble, Pauline
    ANSTO, Lucas Heights, NSW, Australia.
    Unal-Imer, Ezgi
    Middle East Tech Univ, Dept Geol Engn, Ankara, Turkey.
    Vaks, Anton
    Geol Survey Israel, 32 Yeshayahu Leibowitz, IL-9371234 Jerusalem, Israel.
    Vansteenberge, Stef
    Vrije Univ Brussel, Dept Chem, Analyt, Environm & Geochem, Brussels, Belgium.
    Voarintsoa, Ny Riavo G.
    Hebrew Univ Jerusalem, Inst Earth Sci, Edmond J Safra Campus, IL-91904 Jerusalem, Israel.
    Wong, Corinne
    Univ Texas Austin, Inst Environm Sci, 2275 Speedway, Austin, TX 78712 USA.
    Wortham, Barbara
    Univ Calif Davis, Dept Earth & Planetary Sci, Davis, CA 95616 USA.
    Wurtzel, Jennifer
    Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT, Australia;Australian Natl Univ, ARC Ctr Excellence Climate Syst Sci, Canberra, ACT, Australia.
    Zhang, Haiwei
    Xi An Jiao Tong Univ, Inst Global Environm Change, Xian, Shaanxi, Peoples R China.
    Evaluating model outputs using integrated global speleothem records of climate change since the last glacial2019Inngår i: Climate of the Past, ISSN 1814-9324, E-ISSN 1814-9332, Vol. 15, nr 4, s. 1557-1579Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Although quantitative isotope data from speleothems has been used to evaluate isotope-enabled model simulations, currently no consensus exists regarding the most appropriate methodology through which to achieve this. A number of modelling groups will be running isotope-enabled palaeoclimate simulations in the framework of the Coupled Model Intercomparison Project Phase 6, so it is timely to evaluate different approaches to using the speleothem data for data-model comparisons. Here, we illustrate this using 456 globally distributed speleothem delta O-18 records from an updated version of the Speleothem Isotopes Synthesis and Analysis (SISAL) database and palaeoclimate simulations generated using the ECHAM5-wiso isotope-enabled atmospheric circulation model. We show that the SISAL records reproduce the first-order spatial patterns of isotopic variability in the modern day, strongly supporting the application of this dataset for evaluating model-derived isotope variability into the past. However, the discontinuous nature of many speleothem records complicates the process of procuring large numbers of records if data-model comparisons are made using the traditional approach of comparing anomalies between a control period and a given palaeoclimate experiment. To circumvent this issue, we illustrate techniques through which the absolute isotope values during any time period could be used for model evaluation. Specifically, we show that speleothem isotope records allow an assessment of a model's ability to simulate spatial isotopic trends. Our analyses provide a protocol for using speleothem isotope data for model evaluation, including screening the observations to take into account the impact of speleothem mineralogy on delta O-18 values, the optimum period for the modern observational baseline and the selection of an appropriate time window for creating means of the isotope data for palaeo-time-slices.

  • 6.
    Czymzik, Markus
    et al.
    GFZ German Res Ctr Geosci, Sect Climate Dynam & Landscape Evolut 5 2, D-14473 Potsdam, Germany;Leibniz Inst Balt Sea Res Warnemunde IOW, Marine Geol, D-18119 Rostock, Germany.
    Muscheler, Raimund
    Lund Univ, Quaternary Sci, Dept Geol, S-22362 Lund, Sweden.
    Adolphi, Florian
    Lund Univ, Quaternary Sci, Dept Geol, S-22362 Lund, Sweden;Univ Bern, Inst Phys, Climate & Environm Phys, CH-3012 Bern, Switzerland.
    Mekhaldi, Florian
    Lund Univ, Quaternary Sci, Dept Geol, S-22362 Lund, Sweden.
    Draeger, Nadine
    GFZ German Res Ctr Geosci, Sect Climate Dynam & Landscape Evolut 5 2, D-14473 Potsdam, Germany.
    Ott, Florian
    GFZ German Res Ctr Geosci, Sect Climate Dynam & Landscape Evolut 5 2, D-14473 Potsdam, Germany;Max Planck Inst Sci Human Hist, D-07743 Jena, Germany.
    Slowinski, Michal
    Polish Acad Sci, Inst Geog & Spatial Org, PL-00818 Warsaw, Poland.
    Blaszkiewicz, Miroslaw
    Polish Acad Sci, Inst Geog & Spatial Org, PL-00818 Warsaw, Poland;Polish Acad Sci, Inst Geog & Spatial Org, PL-87100 Torun, Poland.
    Aldahan, Ala
    United Arab Emirates Univ, Dept Geol, Al Ain 15551, U Arab Emirates.
    Possnert, Göran
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, Tandemlaboratoriet.
    Brauer, Achim
    GFZ German Res Ctr Geosci, Sect Climate Dynam & Landscape Evolut 5 2, D-14473 Potsdam, Germany.
    Synchronizing 10Be in two varved lake sediment records to IntCal13 14C during three grand solar minima2018Inngår i: Climate of the Past, ISSN 1814-9324, E-ISSN 1814-9332, Vol. 14, nr 5, s. 687-696Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Timescale uncertainties between paleoclimate reconstructions often inhibit studying the exact timing, spatial expression and driving mechanisms of climate variations. Detecting and aligning the globally common cosmogenic radionuclide production signal via a curve fitting method provides a tool for the quasi-continuous synchronization of paleoclimate archives. In this study, we apply this approach to synchronize Be-10 records from varved sediments of Tiefer See and Lake Czechowskie covering the Maunder, Homeric and 5500 a BP grand solar minima with C-14 production rates inferred from the IntCal13 calibration curve. Our analyses indicate best fits with C-14 production rates when the Be-10 records from Tiefer See were shifted for 8 (-12/+4) (Maunder Minimum), 31 (-16/+12) (Homeric Minimum) and 86 (-22/+18) years (5500 a BP grand solar minimum) towards the past. The best fit between the Lake Czechowskie Be-10 record for the 5500 a BP grand solar minimum and C-14 production was obtained when the Be-10 time series was shifted 29 (-8/+7) years towards present. No significant fits were detected between the Lake Czechowskie Be-10 records for the Maunder and Homeric minima and C-14 production, likely due to intensified in-lake sediment resuspension since about 2800 a BP, transporting "old" Be-10 to the coring location. Our results provide a proof of concept for facilitating Be-10 in varved lake sediments as a novel synchronization tool required for investigating leads and lags of proxy responses to climate variability. However, they also point to some limitations of Be-10 in these archives, mainly connected to in-lake sediment resuspension processes.

  • 7. Guglielmin, Mauro
    et al.
    Donatelli, Marco
    Semplice, Matteo
    Serra Capizzano, Stefano
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Matematisk-datavetenskapliga sektionen, Institutionen för informationsteknologi, Avdelningen för beräkningsvetenskap. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Matematisk-datavetenskapliga sektionen, Institutionen för informationsteknologi, Numerisk analys.
    Ground surface temperature reconstruction for the last 500 years obtained from permafrost temperatures observed in the Share Stelvio borehole, Italian Alps2018Inngår i: Climate of the Past, ISSN 1814-9324, E-ISSN 1814-9332, Vol. 14, s. 709-724Artikkel i tidsskrift (Fagfellevurdert)
  • 8. Lougheed, B. C.
    et al.
    Filipsson, H. L.
    Snowball, Ian
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Geofysik.
    Large spatial variations in coastal C-14 reservoir age a case study from the Baltic Sea2013Inngår i: Climate of the Past, ISSN 1814-9324, E-ISSN 1814-9332, Vol. 9, nr 3, s. 1015-1028Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Coastal locations are highly influenced by input from freshwater river runoff, including sources of terrestrial carbon, which can be expected to modify the C-14 reservoir age, or R(t), associated with marine water. In this Baltic Sea case study, pre-bomb museum collection mollusc shells of known calendar age, from 30 locations across a strategic salinity transect of the Baltic Sea, were analysed for C-14, delta C-13 and delta O-18. R (t) was calculated for all 30 locations. Seven locations, of which six are within close proximity of the coast, were found to have relatively higher R(t) values, indicative of hard-water effects. Whenever possible, the Macoma genus of mollusc was selected from the museum collections, in order to exclude species specific reservoir age effects as much as possible. When the Macoma samples are exclusively considered, and samples from hard-water locations excluded, a statistically significant correlation between Macoma R(t) and average salinity is found, indicating a two end-member linear mixing model between (14)Cmarine and C-14(runoff). A map of Baltic Sea Macoma aragonite R(t) for the late 19th and early 20th centuries is produced. Such a map can provide an estimate for contemporary Baltic Sea Macoma R(t), although one must exercise caution when applying such estimates back in time or to C-14 dates obtained from different sample material. A statistically significant correlation is found between delta O-18(aragonite) and Macoma R(t), suggesting that delta O-18(aragonite) can be used to estimate Macoma palaeo-R (t), due to the delta O-18(aragonite) signal being dominated by the salinity gradient of the Baltic Sea. A slightly increased correlation can be expected when delta O-18(aragonite) is corrected for temperature fractionation effects. The results of this Baltic Sea case study, which show that R(t) is affected by hydrographic conditions and local carbon inputs, have important consequences for other coastal and estuarine locations, where R(t) is also likely to significantly vary on spatial and temporal bases.

  • 9.
    Lougheed, Bryan C.
    et al.
    Lunds universitet.
    Filipsson, Helena F.
    Lunds universitet.
    Large spatial variations in coastal 14C reservoir age - a case study from the Baltic Sea2013Inngår i: Climate of the Past, ISSN 1814-9324, E-ISSN 1814-9332, Vol. 9, s. 1015-1028Artikkel i tidsskrift (Fagfellevurdert)
  • 10.
    Lougheed, Bryan C.
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Naturresurser och hållbar utveckling. Uppsala UniUniv Paris Saclay, IPSL, LSCE, CEA,CNRS,UVSQ, F-91190 Gif Sur Yvette, France.
    Metcalfe, Brett
    Univ Paris Saclay, IPSL, LSCE, CEA,CNRS,UVSQ, F-91190 Gif Sur Yvette, France;Vrije Univ Amsterdam, Dept Earth Sci, Fac Sci, De Boelelaan 1085, NL-1081 HV Amsterdam, Netherlands.
    Ninnemann, Ulysses S.
    Univ Bergen, Dept Earth Sci, Allegaten 41, N-5007 Bergen, Norway.
    Wacker, Lukas
    Swiss Fed Inst Technol, Lab Ion Beam Phys, Otto Stern Weg 5, CH-8093 Zurich, Switzerland.
    Moving beyond the age-depth model paradigm in deep-sea palaeoclimate archives: dual radiocarbon and stable isotope analysis on single foraminifera2018Inngår i: Climate of the Past, ISSN 1814-9324, E-ISSN 1814-9332, Vol. 14, nr 4, s. 515-526Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Late-glacial palaeoclimate reconstructions from deep-sea sediment archives provide valuable insight into past rapid changes in ocean chemistry. Unfortunately, only a small proportion of the ocean floor with sufficiently high sediment accumulation rate (SAR) is suitable for such reconstructions using the long-standing age-depth model approach. We employ ultra-small radiocarbon (C-14) dating on single microscopic foraminifera to demonstrate that the long-standing age-depth model method conceals large age uncertainties caused by post-depositional sediment mixing, meaning that existing studies may underestimate total geochronological error. We find that the age-depth distribution of our C-14-dated single foraminifera is in good agreement with existing bioturbation models only after one takes the possibility of Zoophycos burrowing into account. To overcome the problems associated with the age-depth paradigm, we use the first ever dual C-14 and stable isotope (delta O-18 and delta C-13) analysis on single microscopic foraminifera to produce a palaeoclimate time series independent of the age-depth paradigm. This new state of the art essentially decouples single foraminifera from the age-depth paradigm to provide multiple floating, temporal snapshots of ocean chemistry, thus allowing for the successful extraction of temporally accurate palaeoclimate data from low-SAR deep-sea archives. This new method can address large geographical gaps in late-glacial benthic palaeoceanographic reconstructions by opening up vast areas of previously disregarded, low-SAR deep-sea archives to research, which will lead to an improved understanding of the global interaction between oceans and climate.

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