Environmental Responses of the Northeast Antarctic Peninsula to the Holocene Climate Variability

In this study, we present a unique high-resolution Holocene record of oceanographic and climatic change based on analyses of diatom assemblages combined with biomarker data from a sediment core collected from the Vega Drift, eastern Antarctic Peninsula (EAP). These data add to the climate framework...

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Bibliographic Details
Published in:Paleoceanography
Main Authors: Barbara, Loïc, Crosta, Xavier, Leventer, Amy, Schmidt, Sabine, Etourneau, Johan, Domack, Eugene, Massé, Guillaume
Format: Article in Journal/Newspaper
Language:unknown
Published: Digital Commons @ University of South Florida 2016
Subjects:
Holocene
Antarctic Peninsula
sea ice
Westerlies
diatoms
HBI
Life Sciences
Antarctic
Weddell
Palmer Deep
Antarc*
Sea ice
Online Access:https://digitalcommons.usf.edu/msc_facpub/2555
https://doi.org/10.1002/2015PA002785
Description
Summary:In this study, we present a unique high-resolution Holocene record of oceanographic and climatic change based on analyses of diatom assemblages combined with biomarker data from a sediment core collected from the Vega Drift, eastern Antarctic Peninsula (EAP). These data add to the climate framework already established by high-resolution marine sedimentary records from the Palmer Deep, western Antarctic Peninsula (WAP). Heavy sea ice conditions and reduced primary productivity were observed prior to 7.4 ka B.P. in relation with the proximity of the glacial ice melt and calving. Subsequent Holocene oceanographic conditions were controlled by the interactions between the Westerlies-Antarctic Circumpolar Current (ACC)-Weddell Gyre dynamics. A warm period characterized by short seasonal sea ice duration associated with a southern shift of both ACC and Westerlies field persisted until 5 ka B.P. This warm episode was then followed by climate deterioration during the middle-to-late Holocene (5 to 1.9 ka B.P.) with a gradual increase in annual sea ice duration triggered by the expansion of the Weddell Gyre and a strong oceanic connection from the EAP to the WAP. Increase of benthic diatom species during this period was indicative of more summer/autumn storms, which was consistent with changes in synoptic atmospheric circulation and the establishment of low- to high-latitude teleconnections. Finally, the multicentennial scale variability of the Weddell Gyre intensity and storm frequency during the late Holocene appeared to be associated with the increased El Niño–Southern Oscillation frequency.

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