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The last Eurasian ice sheets - a chronological database and time-slice reconstruction, DATED-1

Hughes, Anna L. C. ; Gyllencreutz, Richard ; Lohne, Øystein S. ; Mangerud, Jan ; Svendsen, John Inge

Boreas, 2016-01, Vol.45 (1), p.1-45 [Periódico revisado por pares]

Aarhus: Blackwell Publishing Ltd

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  • Título:
    The last Eurasian ice sheets - a chronological database and time-slice reconstruction, DATED-1
  • Autor: Hughes, Anna L. C. ; Gyllencreutz, Richard ; Lohne, Øystein S. ; Mangerud, Jan ; Svendsen, John Inge
  • É parte de: Boreas, 2016-01, Vol.45 (1), p.1-45
  • Notas: Norwegian Research Council
    ICEHUS - No. 176048
    Bjerknes Centre for Climate Research (BCCR)
    ArticleID:BOR12142
    ark:/67375/WNG-8DNP05MD-W
    istex:8F637960A49044DE48B147B3F2FD0896C692296F
    Data S1. Document describing details of DATED-1 GIS .shp and .kmz files, including notes relating to their use, and reference list for citations contained within DATED-1 database.Data S2. DATED-1 database and time-slice reconstruction maps in GIS .shp and .kmz format. Also available to download from PANGAEA: http://doi.pangaea.de/10.1594/PANGAEA.848117).Table S1. DATED-1 database of dates related to the build-up and retreat of the last Eurasian ice sheets, separated by dating method: A. Radiocarbon dates, B. Terrestrial Cosmogenic Nuclide dates, C. Luminescence dates, D. Uranium Series dates.   Table S2. Additional data from radiocarbon calibration conducted on the DATED-1 database.Table S3. Additional metadata required for calculation of terrestrial cosmogenic nuclide exposure ages (10Be and 26Al) contained within the DATED-1 database.Table S4. Terrestrial cosmogenic nuclide exposure ages contained within DATED-1 calculated using different scaling schemes and global (Balco et al. ) and Arctic (Young et al. ) production rates.Table S5. Area and volume of DATED-1 time-slices.Fig. S1. ISO A3 versions of DATED-1 time-slice maps as shown in Fig. 5: Pre-25 ka DATED-1 time-slice reconstruction.Fig. S2. ISO A3 versions of DATED-1 time-slice maps as shown in Fig. 6: DATED-1 time-slice reconstruction of the evolution of the extent of the Eurasian ice Sheets 25-10 ka.
    RAPID programme
    EISCLIM - No. 229788/E10
    ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: We present a new time‐slice reconstruction of the Eurasian ice sheets (British–Irish, Svalbard–Barents–Kara Seas and Scandinavian) documenting the spatial evolution of these interconnected ice sheets every 1000 years from 25 to 10 ka, and at four selected time periods back to 40 ka. The time‐slice maps of ice‐sheet extent are based on a new Geographical Information System (GIS) database, where we have collected published numerical dates constraining the timing of ice‐sheet advance and retreat, and additionally geomorphological and geological evidence contained within the existing literature. We integrate all uncertainty estimates into three ice‐margin lines for each time‐slice; a most‐credible line, derived from our assessment of all available evidence, with bounding maximum and minimum limits allowed by existing data. This approach was motivated by the demands of glaciological, isostatic and climate modelling and to clearly display limitations in knowledge. The timing of advance and retreat were both remarkably spatially variable across the ice‐sheet area. According to our compilation the westernmost limit along the British–Irish and Norwegian continental shelf was reached up to 7000 years earlier (at c. 27–26 ka) than the eastern limit on the Russian Plain (at c. 20–19 ka). The Eurasian ice sheet complex as a whole attained its maximum extent (5.5 Mkm2) and volume (~24 m Sea Level Equivalent) at c. 21 ka. Our continental‐scale approach highlights instances of conflicting evidence and gaps in the ice‐sheet chronology where uncertainties remain large and should be a focus for future research. Largest uncertainties coincide with locations presently below sea level and where contradicting evidence exists. This first version of the database and time‐slices (DATED‐1) has a census date of 1 January 2013 and both are available to download via the Bjerknes Climate Data Centre and PANGAEA (www.bcdc.no; http://doi.pangaea.de/10.1594/PANGAEA.848117).
  • Editor: Aarhus: Blackwell Publishing Ltd
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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