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Méheust, Marie; Stein, Ruediger; Fahl, Kirsten; Gersonde, Rainer (2018): IP25 and Uk'37 proxy records from sediment cores from the subarctic Pacific and the Bering Sea. PANGAEA, https://doi.org/10.1594/PANGAEA.887833, Supplement to: Méheust, M et al. (2018): Sea-ice variability in the subarctic North Pacific and adjacent Bering Sea during the past 25 ka: new insights from IP25 and Uk′37 proxy records. In: O'Cofaigh, C., Kirchner, N., Federov, G., Noormets, R. and de Vernal, A. (Eds.), Arctic environmental change beyond instrumental records, Special PAST Gateways issue of arktos, arktos - The Journal of Arctic Geosciences, 4(1), https://doi.org/10.1007/s41063-018-0043-1

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Abstract:
This study focusses on the last glacial-deglacial-Holocene spatial and temporal variability in sea-ice cover based on organic geochemical analyses of marine sediment cores from the subarctic Pacific and the Bering Sea. By means of the sea ice proxy "IP25/PIP25" and phytoplankton-derived biomarkers (specific sterols and alkenones), we reconstruct the spring sea-ice conditions, (summer) sea-surface temperature (SST) and primary productivity, respectively. The large variability of sea ice was explained by a combination of local and global factors, such as solar insolation, global climate anomalies and sea-level changes controlling the oceanographic circulation and water mass exchange between the subarctic Pacific and the Bering Sea. During the Last Glacial Maximum, extensive sea-ice cover prevailed over large part of the subarctic Pacific and the Bering Sea. The following deglaciation is characterized by a rapid sea-ice advance and retreat. During cold periods (Heinrich Stadial 1 and Younger Dryas) seasonal sea-ice cover generally coincided with low alkenone SSTs and low primary productivity. Conversely, during warmer intervals (Bølling/Allerød, Early Holocene) reduced sea ice or ice-free conditions prevailed in the study area. In the northern Bering Sea continental shelf a late-Early/Mid Holocene shift to marginal sea-ice conditions is in line with the simultaneous wide-spread sea-ice recovery observed in the other Arctic marginal seas and is likely initiated by the lower Northern Hemisphere insolation and surface-water cooling.
Coverage:
Median Latitude: 55.231467 * Median Longitude: -173.781333 * South-bound Latitude: 51.271500 * West-bound Longitude: 167.699700 * North-bound Latitude: 60.126700 * East-bound Longitude: -149.600200
Date/Time Start: 2009-07-17T04:01:00 * Date/Time End: 2009-08-02T08:30:00
Size:
3 datasets

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