IP25 and Uk'37 proxy records from sediment cores from the subarctic Pacific and the Bering Sea

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 bi...

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Bibliographic Details
Main Authors: Méheust, Marie, Stein, Ruediger, Fahl, Kirsten, Gersonde, Rainer
Format: Dataset
Language:English
Published: PANGAEA 2018
Subjects:
AWI_Paleo
Paleoenvironmental Reconstructions from Marine Sediments @ AWI
Arctic
Bering Sea
Pacific
Phytoplankton
Sea ice
Subarctic
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.887833
https://doi.org/10.1594/PANGAEA.887833
Description
Summary: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.

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