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  • 1. Ahmed, M
    et al.
    Aldahan, A
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Earth Sciences, Department of Earth Sciences. ELD.
    Eriksson, T
    A Mössbauer and mineralogical investigation of Quaternary soils from central Sudan1990In: Arid Soil Res. Rehab, Vol. 52, p. 55-75Article in journal (Refereed)
  • 2.
    Aldahan, A
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Earth Sciences, Department of Earth Sciences. ELD.
    Albitized feldspars in granite and their bearing on the recognition of diagenetic vs detrital origin of albitized feldspar in sandstone1991In: Bull. Geol. Inst. Uppsala, Vol. 16, p. 47-60Article in journal (Refereed)
  • 3.
    Aldahan, A
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Earth Sciences, Department of Earth Sciences. ELD.
    Alteration and mass transfer in cataclasites and mylonites in 6.6 Km of granitic crust at the Siljan impact structure1990In: Contribribution to Mineralogy and Petrology, Vol. 105, p. 662-676Article in journal (Refereed)
  • 4.
    Aldahan, A
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Earth Sciences, Department of Earth Sciences. ELD.
    Occurrence of epidote, pumpellyite and prehnite in Proterozoic clastics, dolerites and basalts from central Sweden1986In: NeUES JAHRBUCH FUR MINERALOGI, Vol. 155, p. 147-164Article in journal (Refereed)
  • 5.
    Aldahan, A
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Earth Sciences, Department of Earth Sciences. ELD.
    The paragenesis of pumpellyite in granitic rocks from the Siljan area, central Sweden1989In: NeUES JAHRBUCH FUR MINERALOGI, Vol. 1989, p. 367-383Article in journal (Refereed)
  • 6.
    Aldahan, A A
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Earth Sciences, Department of Earth Sciences. Technology, Department of Engineering Sciences, Ion Physics.
    Possnert, G
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Technology, Department of Engineering Sciences, Ion Physics. Jonfysik.
    Geomagnetic and climatic variability reflected by 10Be during the Quaternary and late Pliocene2003In: Geophysical Research Letter, Vol. 30, no 6Article in journal (Refereed)
  • 7.
    Aldahan, A
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Earth Sciences, Department of Earth Sciences. ELD.
    Eriksson, T
    Collini, B
    Mössbauer spectroscopic data of granitic rocks from Gravberg-1 well, Siljan Ring structure, central Sweden1988In: DDCB vol. 1, Springer-Verlag, Vol. 1, p. 217-223Article in journal (Refereed)
  • 8.
    Aldahan, A
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Earth Sciences, Department of Earth Sciences. ELD.
    Morad, S
    A SEM study of dissolution textures of detrital feldspars in Proterozoic sandstones from Sweden1987In: American Journal of Science, Vol. 287, p. 460-514Article in journal (Refereed)
  • 9.
    Aldahan, A
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Earth Sciences, Department of Earth Sciences. ELD.
    Morad, S
    Authigenic sphene in sandstones of the Brottum Formation (Norway) and the Dala Sandstone (Sweden).1986In: NeUES JAHRBUCH FUR MINERALOGI, Vol. 1986, p. 135-144Article in journal (Refereed)
  • 10.
    Aldahan, A
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Earth Sciences, Department of Earth Sciences. ELD.
    Morad, S
    Chemistry of detrital biotites and their phyllosilicate intergrowths in sandstones1986In: Clays Clay Minerals, Vol. 34, p. 539-548Article in journal (Refereed)
  • 11.
    Aldahan, A
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Earth Sciences, Department of Earth Sciences. ELD.
    Morad, S
    Mineralogy and chemistry of diagenetic clay minerals in Proterozoic sandstones from Sweden1986In: American Journal of Science, Vol. 268, p. 29-80Article in journal (Refereed)
  • 12.
    Aldahan, A
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Earth Sciences, Department of Earth Sciences. ELD.
    Morad, S
    Some remarks on stability of sphene in diagenetic environments1988In: Chemical Geology, Vol. 70, p. 249-255Article in journal (Refereed)
  • 13.
    Aldahan, A
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Earth Sciences, Department of Earth Sciences. ELD.
    Morad, S
    Collini, B
    Clouded-untwinned albite in the Siljan granite, central Sweden1987In: NeUES JAHRBUCH FUR MINERALOGI, Vol. 1987, p. 327-335Article in journal (Refereed)
  • 14.
    Aldahan, A
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Earth Sciences, Department of Earth Sciences. ELD.
    Ounchanum, P
    Morad, S
    Chemistry of micas and chlorites in Proterozoic acid metacolcanics and associated rocks from the Hästefält area Norbery ore district, central Sweden1988In: Contribribution to Mineralogy and Petrology, Vol. 100, p. 19-34Article in journal (Refereed)
  • 15.
    Aldahan, A
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Earth Sciences, Department of Earth Sciences.
    Possnert, G
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Jonfysik.
    The Be-10 marine record of the last 3.5 Ma2000In: NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS, ISSN 0168-583X, Vol. 172, p. 513-517Article in journal (Refereed)
    Abstract [en]

    We present in this study a Be-10 profile from a deep-sea sediment section extending to 3.5 Ma. The Be-10 concentration ranges at 2-14 x 10(8) atoms/g and shows a clear decay trend. The flux of Be-10 ranges at 1-5 x 10(6) atoms/cm(2) y and averages at appr

  • 16.
    Aldahan, A
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Earth Sciences, Department of Earth Sciences. ELD.
    Possnert, G
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. jonfysik.
    Gard, G
    10Be in two sediment sections from the North Atlantic and chronological implications for the Late Quaternary1994In: Nues Jar. Geol. Paleon. Mh, Vol. H7, p. 418-433Article in journal (Refereed)
  • 17.
    Aldahan, A
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Earth Sciences, Department of Earth Sciences. ELD.
    Possnert, G
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. jonfysik.
    Olausson, E
    10Be distribution in sediments of two cores from the North Atlantic: an approach for evaluating environmental change1992In: Bull. Geol. Inst. Uppsala, Vol. 16, p. 69-80Article in journal (Refereed)
  • 18.
    Aldahan, A
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Earth Sciences, Department of Earth Sciences.
    Possnert, G
    Scherer, R
    Shi, Ning
    Backman, J
    Boström, K
    Trace-element and major-element stratigraphy in quaternary sediments from the Arctic Ocean and implications for glacial termination2000In: JOURNAL OF SEDIMENTARY RESEARCH, ISSN 1073-130X, Vol. 70, no 5, p. 1095-1106Article in journal (Refereed)
    Abstract [en]

    The distribution patterns of major and trace elements in sediment cores from the Arctic Ocean, specifically the Yermak Plateau and the Nansen Basin, were evaluated as climate and environmental proxy records of the last 350 ka. The sediments are carbonate

  • 19.
    Aldahan, A
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Earth Sciences, Department of Earth Sciences. ELD.
    Ramseyer, K
    Morad, S
    Collini, B
    Low temperature alterations in granitic rocks from the Siljan Ring structure, central Sweden1988In: DDCB vol. 1, Springer-Verlag, Vol. 12, p. 209-216Article in journal (Refereed)
  • 20.
    Aldahan, Ala
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Air and Water Science.
    Alfimov, V.
    Possnert, Göran
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    I-129 anthropogenic budget: major sources and sinks2007In: Applied Geochemistry, ISSN 0883-2927, E-ISSN 1872-9134, Vol. 22, no 3, p. 606-618Article in journal (Refereed)
    Abstract [en]

    Data are presented here on the anthropogenic 129I inventory in regions that have been strongly affected by releases from European reprocessing facilities which, to the authors’ knowledge, presently account for >90% of the global isotope source in the Earth’s surface environment. The results show that >90% of the isotope inventory occurs in marine waters with the Nordic Seas and Eurasian basin of the Arctic Ocean containing most of the 129I. Within the terrestrial environment of Europe, soils contain the largest part of the isotope inventory. However, the inventory of the terrestrial system did not provide clues on the most plausible atmospheric source of 129I to Europe, thus supply from both gaseous and marine releases is proposed. The sum of the total inventory in both the marine and terrestrial environments did not match the estimated releases. This imbalance is likely to relate to unconstrained inventory estimates for marine basins (Irish Sea, English Channel and North Sea) close to the facilities, but also to the occurrence of 129I in the biosphere, and possible overestimated releases from the nuclear reprocessing facilities. There is no doubt that the available data on 129I distribution in the environment are far from representative and further research is urgently needed to construct a comprehensive picture.

  • 21.
    Aldahan, Ala
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Earth Sciences, Department of Earth Sciences. Technology, Department of Engineering Sciences, Ion Physics. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Earth Sciences, Department of Earth Sciences, Environment and Landscape Dynamics. Miljö- och landskapsdynamik.
    Alfimov, Vasily
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Technology, Department of Engineering Sciences, Ion Physics. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Earth Sciences, Department of Earth Sciences, Environment and Landscape Dynamics. Jonfysik.
    Kekli, A
    Possnert, Göran
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Technology, Department of Engineering Sciences, Ion Physics. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Earth Sciences, Department of Earth Sciences, Environment and Landscape Dynamics. jonfysik.
    Cato, Ingemar
    Anthropogenic I-129 in the Baltic Sea2005In: 10th International conference on accelerator mass spectrometry, Berkeley, 2005, p. 33-Conference paper (Refereed)
  • 22.
    Aldahan, Ala
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Earth Sciences, Department of Earth Sciences. Technology, Department of Engineering Sciences, Ion Physics. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Earth Sciences, Department of Earth Sciences, Environment and Landscape Dynamics. ELD.
    Alfimov, Vasily
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Technology, Department of Engineering Sciences, Ion Physics. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Earth Sciences, Department of Earth Sciences, Environment and Landscape Dynamics. Jonfysik.
    Possnert, Göran
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Technology, Department of Engineering Sciences, Ion Physics. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Earth Sciences, Department of Earth Sciences, Environment and Landscape Dynamics. jonfysik.
    The 129I anthropogenic budget:sources and sinks2005In: Geochimica et cosmochimica Acta, Vol. 69, no 10, p. A716-Article in journal (Refereed)
  • 23.
    Aldahan, Ala
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences.
    Englund, Edvard
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics.
    Possnert, Göran
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics.
    Cato, Ingemar
    Hou, Xiaolin
    Iodine-129 enrichment in sediment of the Baltic Sea2007In: Applied Geochemistry, ISSN 0883-2927, E-ISSN 1872-9134, Vol. 22, no 3, p. 637-647Article in journal (Refereed)
    Abstract [en]

    Sediments are an excellent archive for evaluation of time-series environmental contamination of water systems. Measurements of ultra-trace radioactive species, such as 129I, provide information for both chronologic calibration and anthropogenic emissions during the nuclear era. Here data are presented on 129I and other chemical parameters from two sediment cores collected in the Baltic Sea during 1997. The sediment sections have a relatively uniform grain size (clay–mud) and cover a period of about 50 a. Distribution of 129I in the sediment strongly relates to the liquid release records from the nuclear reprocessing facilities at Sellafield and La Hague. However, syn- and post-depositional alteration of organic matter at the sediment–water interface and within the sediment column may have contributed to slightly obliterating the anthropogenic 129I signals. Indication of Chernobyl-derived 129I occurs in the sediment profile, but is apparently overridden by the overwhelming flux from the nuclear reprocessing facilities. Although the record did not cover the pre-nuclear era (before 1945) sections, the ultra sensitive 129I profile provides a potential tool for relative dating and monitoring sources of water and sediment to the region.

  • 24.
    Aldahan, Ala
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
    Hedfors, Jim
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
    Possnert, Göran
    Uppsala University, Disciplinary Domain of Science and Technology, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, Tandem Laboratory. Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics.
    Kulan, Abdulhadi
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
    Berggren, Ann-Marie
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
    Söderström, C.
    FOI, Swedish Defence Research Agency, Stockholm, Sweden.
    Atmospheric impact on beryllium isotopes as solar activity proxy2008In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 35, no L21812Article in journal (Refereed)
    Abstract [en]

    Reconstructing solar activity variability beyond the time scale of actual measurements provides invaluable data for modeling of past and future climate change. The 10 Be isotope has been a primary proxy archive of past solar activity and cosmic ray intensity, particularly for the last millennium. There is, however, a lack of direct high-resolution atmospheric time series on 10 Be that enable estimating atmospheric modulation on the production signal. Here we report quasi-weekly data on 10 Be and 7 Be isotopes covering the periods 1983-2000 and 1975-2006 respectively, that show, for the first time, coherent variations reflecting both atmospheric and production effects. Our data indicate intrusion of stratosphere/upper troposphere air masses that can modulate the isotopes production signal, and may induce relative peaks in the natural 10 Be archives (i.e., ice and sediment). The atmospheric impact on the Be-isotopes can disturb the production signals and consequently the estimate of past solar activity magnitude. Citation: Aldahan, A., J. Hedfors, G. Possnert, A. Kulan, A.-M. Berggren, and C. Soderstrom (2008), Atmospheric impact on beryllium isotopes as solar activity proxy, Geophys. Res. Lett., 35, L21812, doi: 10.1029/2008GL035189.

  • 25.
    Aldahan, Ala
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics. miljö-och landskapsdynamik.
    Kekli, A
    Possnert, Göran
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics. jonfysik.
    Distribution of 129I in rivers of the Baltic region2006In: Jour. Envir. Radioactivity, Vol. 88, p. 49-73Article in journal (Refereed)
  • 26.
    Aldahan, Ala
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Earth Sciences, Department of Earth Sciences. Technology, Department of Engineering Sciences, Ion Physics. ELD.
    Possnert, Göran
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Technology, Department of Engineering Sciences, Ion Physics. Jonfysik.
    Geomagnetic and climatic variability reflected by 10Be during the Quaternary and Late Pliocene2003In: Geophysical Research Letters, Vol. 30, no 6, p. 10.1029/2002GL016077-Article in journal (Refereed)
  • 27.
    Aldahan, Ala
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences.
    Possnert, Göran
    Uppsala University, Disciplinary Domain of Science and Technology, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, Tandem Laboratory.
    Alfimov, V.
    Cato, I.
    Sveriges geologiska undersökning.
    Kekli, Aziz
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences.
    Anthropogenic I-129 in the Baltic Sea2007In: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, ISSN 0168-583X, E-ISSN 1872-9584, Vol. 259, no 1, p. 491-495Article in journal (Refereed)
    Abstract [en]

    We report here data on the distribution of I-129 in water of the Baltic Sea and Skagerrak-Kattegat basins obtained through sampling campaigns during the years 2000 and 2001. I-129 in the water of the Skagerrak-Kattegat shows persistently high concentrations in both the surface and deep parts. A decreasing trend in surface water I-129 concentration is observed away from the Kattegat basin and into the Baltic Sea. Inventory calculations indicate that at least 95%of the isotope supply to the Baltic Sea is from the North Sea marine water via Skagerrak-Kattegat and only minor part is from riverine inflow and the Chernobyl accident. As the discharges from the nuclear reprocessing facilities were not decreased during the last decade, it is expected that more I-129 will accumulate in the Baltic Sea and related basins in the future. Consequently, systematic sampling is needed to reevaluate the concentration levels not only in the water, but also in the sediments and biota of the region.

  • 28.
    Aldahan, Ala
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Earth Sciences, Department of Earth Sciences. ELD.
    Possnert, Göran
    Technology, Department of Materials Science. jonfysik.
    Buraglio, N
    Steffensen, J
    129I isotope in an ice core from Greenland2000In: 6th International conference on Acid Rain, 10-16 December, Tsukuba, Japan, 2000, p. 122-Conference paper (Refereed)
  • 29.
    Aldahan, Ala
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
    Possnert, Göran
    Uppsala University, Disciplinary Domain of Science and Technology, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, Tandem Laboratory.
    El Saiy, A.
    Abdelghany, O.
    Particle-bound Be-10 from a low latitude arid region2014In: Journal of Radioanalytical and Nuclear Chemistry, ISSN 0236-5731, E-ISSN 1588-2780, Vol. 299, no 3, p. 1709-1713Article in journal (Refereed)
    Abstract [en]

    The Be-10 isotope is widely used in geochronology, climate and environmental analyses and astrophysics where atmospheric deposition model estimate plays a vital role for the initial concentration. Data from arid regions have not been well constrained because of sparse measurement and here we present Be-10 concentration in samples of dust, soil, marine sediments and paleosol collected from an arid to semi-arid low latitude region. These results indicate concentrations that are about a factor of three lower than values expected from latitude zonal models, but are comparable with global atmospheric depositional model. The agreement and discrepancy between model and measured data are rather vital for establishing accurate initial Be-10 in the Earth's surface environment for reconstruction of paleoclimatic variability (precipitation rates and temperature).

  • 30.
    Aldahan, Ala
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
    Scherer, Reed
    Sjunneskog, C
    Possnert, Göran
    Uppsala University, Disciplinary Domain of Science and Technology, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, Tandem Laboratory. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Ion Physics.
    Berggren, A-M
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
    Cosmogenic 10Be as an environmental tracer in subglacial Antarctic Lake2006In: SALE advanced Science and Technology Workshop, 24-26 April, Grenoble, France,, 2006, p. 2-3Conference paper (Refereed)
  • 31.
    Alfimov, V
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Earth Sciences, Department of Earth Sciences, Environment and Landscape Dynamics. Technology, Department of Engineering Sciences, Ion Physics. Jonfysik.
    Aldahan, Ala
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Earth Sciences, Department of Earth Sciences, Environment and Landscape Dynamics. Technology, Department of Engineering Sciences, Ion Physics. ELD.
    Possnert, Göran
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Earth Sciences, Department of Earth Sciences, Environment and Landscape Dynamics. Technology, Department of Engineering Sciences, Ion Physics. Jonfysik.
    A transect of 129I in seawater from the North Pole to the Norwegian Sea2003In: Geophysical Research Abstracts, 5,, 2003, 2003, p. 05989-Conference paper (Other (popular scientific, debate etc.))
  • 32. Alfimov, V.
    et al.
    Aldahan, Ala
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Earth Sciences, Department of Earth Sciences. ELD.
    Possnert, Göran
    Technology, Department of Materials Science. jonfysik.
    Iodine-129 in seawater along a transect from the Norwegian Sea to the North Pole2002In: 9th International Conference on Accelerator Mass, Nagoya, Japan, 2002, p. 195-Conference paper (Refereed)
  • 33.
    Alfimov, Vasely
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Ion Physics. Earth Sciences, Department of Earth Sciences, Environment and Landscape Dynamics. Jonfysik.
    Possnert, Göran
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Ion Physics. Earth Sciences, Department of Earth Sciences, Environment and Landscape Dynamics. Jonfysik.
    Aldahan, Ala
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Ion Physics. Earth Sciences, Department of Earth Sciences, Environment and Landscape Dynamics. ELD.
    Anthropogenic iodine-129 in the Arctic Ocean and Nordic Seas: Numerical modeling and prognoses2005In: Marine Pollution Bulletin, Vol. doi 10.1016Article in journal (Refereed)
  • 34.
    Alfimov, Vasilli
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Ion Physics. Earth Sciences, Department of Earth Sciences, Environment and Landscape Dynamics. Jonfysik.
    Aldahan, Ala
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Ion Physics. Earth Sciences, Department of Earth Sciences, Environment and Landscape Dynamics. ELD.
    Possnert, Göran
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Ion Physics. Earth Sciences, Department of Earth Sciences, Environment and Landscape Dynamics. jonfysik.
    Iodine-129 in seawater along a transect from the2003In: 9th International Conference on Accelerator Mass, 2003, p. 195-Conference paper (Refereed)
  • 35. Alfimov, Vasily
    et al.
    Aldahan, Ala
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
    Possnert, Göran
    Uppsala University, Disciplinary Domain of Science and Technology, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, Tandem Laboratory.
    Water masses and I-129 distribution in the Nordic Seas2013In: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, ISSN 0168-583X, E-ISSN 1872-9584, Vol. 294, p. 542-546Article in journal (Refereed)
    Abstract [en]

    The application of the radioactive isotope iodine-129 as a tracer of water circulation in the oceans has provided interesting information with respect to sources and mixing of different water masses. We here present results of I-129 distribution in water profiles located in the Nordic Seas and use the isotope to fingerprint water masses in the region. The samples were collected by the US research vessel Knorr in May-June 2002. I-129 signatures along the Norwegian Sea reflect a mixing of I-129-rich surface water along the Scandinavian continental slope and I-129-poor North Atlantic surface water. These two water masses become less segregated along the Fram Strait where apparent I-129 enrichment penetrates the return Arctic flow into the East Greenland Current. The I-129 data further suggest existence of a water mass that is not entirely labeled with respect to origin at the Denmark Strait bottom water. This water parcel probably originates from the Iceland Sea. I-129 data also shed light on the major deep water outflow from the Nordic Seas located at the Faeroe Bank Channel.

  • 36.
    Alfimov, Vasily
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. Earth Sciences, Department of Earth Sciences, Environment and Landscape Dynamics. Department of Engineering Sciences, Ion Physics. Jonfysik.
    Aldahan, Ala
    Earth Sciences, Department of Earth Sciences, Environment and Landscape Dynamics. Department of Engineering Sciences, Ion Physics. ELD.
    Possnert, Göran
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. Earth Sciences, Department of Earth Sciences, Environment and Landscape Dynamics. Department of Engineering Sciences, Ion Physics. Jonfysik.
    Windsor, Peter
    Anthropogenic iodine-129 in seawater along a transect from the Norwegian coastal current to the North Pole2004In: Marine Pollution Bulletin 49, 1097-1104, 2004, Vol. 49, p. 1097-1104Article in journal (Refereed)
  • 37. Alfimov, Vasily
    et al.
    Possnert, Göran
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics. Jonfysik.
    Aldahan, Ala
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics. miljö-och landskapsdynamik.
    Anthropogenic iodine-129 in the Arctic Ocean and Nordic Seas: Numerical modeling and prognoses2006In: Marine Pollution Bulletin, Vol. 52, p. 380-385Article in journal (Refereed)
  • 38.
    Alfimov, Vasily
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Ion Physics. Earth Sciences, Department of Earth Sciences, Environment and Landscape Dynamics. Jonfysik.
    Possnert, Göran
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Ion Physics. Earth Sciences, Department of Earth Sciences, Environment and Landscape Dynamics. jonfysik.
    Aldahan, Ala
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Ion Physics. Earth Sciences, Department of Earth Sciences, Environment and Landscape Dynamics. ELD.
    Measurement of 36Cl with a gas-filled magnet at the Uppsala Tandem Laboratory2005In: 10th International conference on accelerator mass spectrometry, Berkeley, 2005, p. 88-Conference paper (Refereed)
  • 39.
    Alfimov, Vasily
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, Tandem Laboratory.
    Possnert, Göran
    Uppsala University, Disciplinary Domain of Science and Technology, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, Tandem Laboratory.
    Aldahan, Ala
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Air and Water Science.
    Measurements of Cl-36 with a gas-filled magnet at the Uppsala tandem laboratory2007In: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, ISSN 0168-583X, E-ISSN 1872-9584, Vol. 259, no 1, p. 199-203Article in journal (Refereed)
    Abstract [en]

    The performance of a gas-filled magnet combined with a gas ionization detector for measurements of Cl-36 was systematically studied at the Uppsala tandem laboratory. Our tests were conducted at a terminal voltage of 4,6 MV using gas-foil stripping and a 37 MeV Cl-36(+7) ion beam. An optimal suppression of the interfering isobar S-36 in the stand-alone gas-filled magnet (2 mbar N-2 gas pressure) was found to be >= 300, and an additional >= 300 times reduction was achieved by the Eresidual signal of the two-anode gas ionization detector. The overall suppression in the order of >= 10(5) permits analysis of samples with a sulfur content of <= 5 ppm and Cl-36/Cl ratios of >= 10(-15). We have successfully measured samples with Cl-36/Cl ratios in the range of 10(-12)-10(-15) demonstrating the use of a mediumsized tandem accelerator system (similar to 1 MeV/amu) for Cl-36 AMS.

  • 40. Alshamsi, Dalal M.
    et al.
    Murad, Ahmed A.
    Aldahan, Ala
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
    Hou, Xiaolin
    Uranium isotopes in carbonate aquifers of arid region setting2013In: Journal of Radioanalytical and Nuclear Chemistry, ISSN 0236-5731, E-ISSN 1588-2780, Vol. 298, no 3, p. 1899-1905Article in journal (Refereed)
    Abstract [en]

    Groundwater in arid and semiarid regions is vital resource for many uses and therefore information about concentrations of uranium isotopes among other chemical parameters are necessary. In the study presented here, distribution of U-238 and U-235 in groundwater of four selected locations in the southern Arabian peninsula, namely at two locations within the United Arab Emirates (UAE) and two locations in Oman are discussed. The analyses of the uranium isotopes were performed using ICP-MS and the results indicated a range of concentrations for U-235 and (238) U at 3-39 ng L-1 (average: 18 ng L-1) and 429-5,293 ng L-1 (average: 2,508 ng L-1) respectively. These uranium concentrations are below the higher permissible WHO limit for drinking water and also comparable to averages found in groundwater from similar aquifers in Florida and Tunisia. Negative correlation between rainfall and uranium concentrations suggests that in lithologically comparable aquifers, climate may influence the concentration of uranium in subtropical to arid regions.

  • 41.
    Berggren, Ann-Marie
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences.
    Aldahan, Ala
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
    Possnert, G.
    Hansson, M.
    Steen-Larsen, H. C.
    Sturevik Storm, Anna
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
    Mörth, C. -M
    Murad, A.
    Variability of 10Be and δ18O in snow pits from Greenland and a surface traverse from Antarctica2013In: Proceedings of the Twelfth International Conference on Accelerator Mass Spectrometry, 2013, Vol. 294, p. 568-572Conference paper (Refereed)
    Abstract [en]

    To examine temporal variability of 10Be in glacial ice, we sampled snow to a depth of 160 cm at the NEEM (North Greenland Eemian Ice Drilling) drilling site in Greenland. The samples span three years between the summers of 2006 and 2009. At the same time, spatial variability of 10Be in glacial ice was explored through collection of the upper ∼5 cm of surface snow in Antarctica during part of the Swedish-Japanese traverse from Svea to Syowa station during the austral summer in 2007-2008. The results of the Greenlandic 10Be snow suggested variable concentrations that apparently do not clearly reflect the seasonal change as indicated by the δ18O data. The 10Be concentration variability most likely reflects also effects of aerosol loading and deposition pathways, possibly in combination with post-depositional processes. The Antarctic traverse data expose a negative correlation between 10Be and δ18O, while there are weaker but still significant correlations to altitude and distance to the coast (approximated by the distance to the 70th latitude). These relationships indicate that geographical factors, mainly the proximity to the coast, may strongly affect 10Be concentrations in snow in Queen Maud Land, Antarctica.

  • 42.
    Berggren, Ann-Marie
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
    Aldahan, Ala
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
    Possnert, Göran
    Uppsala University, Disciplinary Domain of Science and Technology, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, Tandem Laboratory.
    Haltia-Hovi, Eeva
    Department of Quaternary Geology, University of Turku, Turku, Finland.
    Saarinen, Timo
    Department of Quaternary Geology, University of Turku, Turku, Finland.
    10Be and solar activity cycles in varved lake sediments, AD 1900–20062010In: Journal of Paleolimnology, ISSN 0921-2728, E-ISSN 1573-0417, Vol. 44, no 2, p. 559-569Article in journal (Refereed)
    Abstract [en]

    Annually resolved terrestrial 10Be archives other than those in polar ice sheets are heretofore unexplored sources of information about past solar activity and climate. Until now, it has proven difficult to find natural archives that have captured and retained a 10Be production signal, and that allow for annual sampling and contain sufficient 10Be for AMS measurement. We report the first annually resolved record of 10Be in varved lake sediments. The record comes from Lake Lehmilampi, eastern Finland, which lies at 63°37′N, 29°06′E, 95.8 m a. s. l. The focus on the last 100 years provided an unprecedented opportunity to compare sediment 10Be data with annual ice core, neutron monitor and sunspot number data. Results indicate successful recovery of 10Be atoms from as little as 20 mg sediment. Sediment 10Be accumulation rates suggest control by solar activity, manifested as a reflection of the 11-year Schwabe solar cycle and its amplitude variations throughout the investigated period. These results open the possibility of using varved lake sediment 10Be records as a new proxy for solar activity, thus providing a new approach for synchronization of paleoclimate events worldwide.

  • 43.
    Berggren, Ann-Marie
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences.
    Aldahan, Ala
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
    Possnert, Göran
    Uppsala University, Disciplinary Domain of Science and Technology, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, Tandem Laboratory.
    Haltia-Hovi, Eeva
    Saarinen, Timo
    Linking ice sheet and lake sediment archives of Be-10, 1468-1980 CE2013In: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, ISSN 0168-583X, E-ISSN 1872-9584, Vol. 294, p. 524-529Article in journal (Refereed)
    Abstract [en]

    As part of understanding and reconstructing our climate history it is important to investigate the link between climate and solar activity. Ice cores and ocean sediments have provided information on a range of timescales on atmospheric Be-10 production, which is a proxy for past solar activity due to its cosmogenic nature of production. We here present results from the first, to our knowledge, multi-centennial and annual resolution study of Be-10 in varved lake sediments. Varves were sampled over an interval covering the period 1468-2006 CE in sediment cored from Lake Lehmilampi in eastern Finland. The measured concentrations were converted into annual Be-10 deposition rates by using the weights of dried samples as an estimation of sedimentation rates and scaling the result from sampling to catchment area size. We compare the lake catchment Be-10 deposition rates to those derived from the Greenlandic ice cores NGRIP and Dye-3 along with past solar activity. Sediment Be-10 concentrations range 2.1-17.6 x 10(8) atoms g(-1). The high end of this range is represented by a limited number of samples, and the average is near the lower end at 4.1 x 10(8) atoms g(-1). The deposition rates range 0.5-3.9 x 10(6) atoms cm(-2) year(-1), with an average of 1.8 x 10(6) atoms cm(-2) year (0.057 atoms cm(-2) s(-1)). We note higher Be-10 deposition during the Sporer (similar to 1415-1535 CE) and Maunder (similar to 1645-1715 CE) solar minima, and also at the onset of the Dalton (similar to 1790-1830 CE) minimum. Equally high Be-10 values in the 1840s and lower deposition during the Dalton minimum are not consistent with contemporaneous solar activity. Although this may in part be a result of incomplete measurements in the 19th century, it also shows the complexity of deposition and the intricacy of reconstructing past solar activity from sediment Be-10 data. A comparison with ice core data reveals particularly good agreement between sediment and Dye-3 Be-10 flux around 1500-1750 CE.

  • 44.
    Berggren, Ann-Marie
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences.
    Aldahan, Ala
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
    Possnert, Göran
    Uppsala University, Disciplinary Domain of Science and Technology, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, Tandem Laboratory.
    Hansson, M.
    Steen-Larsen, H. C.
    Storm, Anna Sturevik
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
    Morth, C. -M
    Murad, A.
    Variability of Be-10 and delta O-18 in snow pits from Greenland and a surface traverse from Antarctica2013In: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, ISSN 0168-583X, E-ISSN 1872-9584, Vol. 294, p. 568-572Article in journal (Refereed)
    Abstract [en]

    To examine temporal variability of Be-10 in glacial ice, we sampled snow to a depth of 160 cm at the NEEM (North Greenland Eemian Ice Drilling) drilling site in Greenland. The samples span three years between the summers of 2006 and 2009. At the same time, spatial variability of Be-10 in glacial ice was explored through collection of the upper similar to 5 cm of surface snow in Antarctica during part of the Swedish-Japanese traverse from Svea to Syowa station during the austral summer in 2007-2008. The results of the Greenlandic 1 Be snow suggested variable concentrations that apparently do not clearly reflect the seasonal change as indicated by the delta O-18 data. The Be-10 concentration variability most likely reflects also effects of aerosol loading and deposition pathways, possibly in combination with post-depositional processes. The Antarctic traverse data expose a negative correlation between Be-10 and delta O-18, while there are weaker but still significant correlations to altitude and distance to the coast (approximated by the distance to the 70th latitude). These relationships indicate that geographical factors, mainly the proximity to the coast, may strongly affect 1 Be concentrations in snow in Queen Maud Land, Antarctica.

  • 45.
    Buraglio, N
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences.
    Aldahan, A
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Earth Sciences, Department of Earth Sciences.
    Possnert, G
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences.
    Analytical techniques and application of 129I in natural water.2000In: Nuclear Instruments and Methods in Physics Research, Vol. 172, p. 518-523Article in journal (Refereed)
  • 46.
    Buraglio, N
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Jonfysik.
    Aldahan, A
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Earth Sciences, Department of Earth Sciences.
    Possnert, G
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Jonfysik.
    I-129 measurements at the Uppsala tandem accelerator2000In: NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS, ISSN 0168-583X, Vol. 161, p. 240-244Article in journal (Refereed)
    Abstract [en]

    The Uppsala tandem accelerator system has been improved for application in I-129 AMS. At present routine measurements at 3% relative error are performed on water samples. The accelerator mass spectrometry (AMS) system background is < 10(-14), but when car

  • 47. Buraglio, N
    et al.
    Aldahan, Ala
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Earth Sciences, Department of Earth Sciences. ELD.
    Possnert, Göran
    Technology, Department of Materials Science. jonfysik.
    AMS of 129I at the Uppsala Tandem Laboratory, Sweden.1999In: 14th International Conference on Ion Beam Analysis, Dreseden, Germany, 1999, p. 77-Conference paper (Refereed)
  • 48. Buraglio, N
    et al.
    Aldahan, Ala
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Earth Sciences, Department of Earth Sciences. ELD.
    Possnert, Göran
    Technology, Department of Materials Science. jonfysik.
    AMS of 129I at Uppsala Tandem Laboratory2000In: Nuclear Instruments and Methods in Physics Research, B 161-163, 240-244,, Vol. 161-163, p. 240-244Article in journal (Refereed)
  • 49. Buraglio, N
    et al.
    Aldahan, Ala
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Earth Sciences, Department of Earth Sciences. ELD.
    Possnert, Göran
    Technology, Department of Materials Science. jonfysik.
    Analytical techniques and applications of 129I in natural water1999In: 8th International Conference on Accelerator Mass Spectrometry, Vienna, Austria, 1999, p. 11267-Conference paper (Refereed)
  • 50. Buraglio, N
    et al.
    Aldahan, Ala
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Earth Sciences, Department of Earth Sciences. ELD.
    Possnert, Göran
    Technology, Department of Materials Science. jonfysik.
    Distribution of I-129 in central Arctic Ocean1999In: EUG, Strasbourg, 1999, p. 582-Conference paper (Refereed)
123 1 - 50 of 124
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