Modern seasonal variability and deglacial/Holocene change of central Arctic Ocean sea-ice cover: New insights from biomarker proxy records.

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dc.contributor.author Fahl, Kirsten
dc.contributor.author Stein, Ruediger
dc.coverage.spatial MEDIAN LATITUDE: 79.619133 * MEDIAN LONGITUDE: 136.159167 * SOUTH-BOUND LATITUDE: 78.166667 * WEST-BOUND LONGITUDE: 133.398333 * NORTH-BOUND LATITUDE: 81.071600 * EAST-BOUND LONGITUDE: 138.920000 * DATE/TIME START: 1993-09-05T00:00:00 * DATE/TIME END: 1996-12-14T00:00:00
dc.date.accessioned 2019-11-26T04:00:14Z
dc.date.available 2019-11-26T04:00:14Z
dc.date.issued 2012-02-13
dc.identifier https://doi.pangaea.de/10.1594/PANGAEA.775891
dc.identifier https://doi.org/10.1594/PANGAEA.775891
dc.identifier.citation Fahl, Kirsten; Stein, Ruediger (2012): Modern seasonal variability and deglacial/Holocene change of central Arctic Ocean sea-ice cover: New insights from biomarker proxy records. Earth and Planetary Science Letters, 351-352, 123-133, https://doi.org/10.1016/j.epsl.2012.07.009
dc.identifier.uri https://repository.geologyscience.ru/handle/123456789/8014
dc.description.abstract For the reconstruction of sea-ice variability, a biomarker approach which is based on (1) the determination of sea-ice diatom-specific highly-branched isoprenoid (IP25) and (2) the coupling of phytoplankton biomarkers and IP25 has been used. For the first time, such a data set was obtained from an array of two sediment traps deployed at the southern Lomonosov Ridge in the central Arctic Ocean at water depth of 150 m and 1550 m and recording the seasonal variability of sea ice cover in 1995/1996. These data indicate a predominantly permanent sea ice cover at the trap location between November 1995 and June 1996, an ice-edge situation with increased phytoplankton productivity and sea-ice algae input in July/August 1996, and the start of new-ice formation in late September. The record of modern sea-ice variability is then used to better interpret data from sediment core PS2458-4 recovered at the Laptev Sea continental slope close to the interception with Lomonosov Ridge and recording the post-glacial to Holocene change in sea-ice cover. Based on IP25 and phytoplankton biomarker data from Core PS2458-4, minimum sea-ice cover was reconstructed for the Bølling/Allerød warm interval between about 14.5 and 13 calendar kyr BP, followed by a rapid and distinct increase in sea-ice cover at about 12.8 calendar kyr BP. This sea-ice event was directly preceded by a dramatic freshwater event and a collapse of phytoplankton productivity, having started about 100 years earlier. These data are the first direct evidence that enhanced freshwater flux caused enhanced sea-ice formation in the Arctic at the beginning of the Younger Dryas. In combination with a contemporaneous, abrupt and very prominent freshwater/meltwater pulse in the Yermak Plateau/Fram Strait area these data may furthermore support the hypothesis that strongly enhanced freshwater (and ice) export from the Arctic into the North Atlantic could have played an important trigger role for the onset of the Younger Dryas cold reversal. During the Early Holocene, sea-ice cover steadily increased again (ice-edge situation), reaching modern sea-ice conditions (more or less permanent sea-ice cover) probably at about 7–8 calendar kyr BP.
dc.format application/zip, 2 datasets
dc.language.iso en
dc.publisher PANGAEA
dc.rights CC-BY-3.0: Creative Commons Attribution 3.0 Unported
dc.rights Access constraints: unrestricted
dc.source Supplement to: Fahl, Kirsten; Stein, Ruediger (2012): Modern seasonal variability and deglacial/Holocene change of central Arctic Ocean sea-ice cover: New insights from biomarker proxy records. Earth and Planetary Science Letters, 351-352, 123-133, https://doi.org/10.1016/j.epsl.2012.07.009
dc.subject Arctic Ocean
dc.subject ARK-IX/4
dc.subject ARK-XI/1
dc.subject AWI_Paleo
dc.subject KAL
dc.subject Kasten corer
dc.subject Laptev Sea
dc.subject Mooring (long time)
dc.subject MOORY
dc.subject Paleoenvironmental Reconstructions from Marine Sediments @ AWI
dc.subject Polarstern
dc.subject PS2458-4
dc.subject PS27
dc.subject PS27/038
dc.subject PS2756-1
dc.subject PS36
dc.subject PS36/051LOMO-2
dc.title Modern seasonal variability and deglacial/Holocene change of central Arctic Ocean sea-ice cover: New insights from biomarker proxy records.
dc.title.alternative Organic geochemical parameters (biomarker) in sedimentary sequences and sediment traps
dc.type Dataset


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