Diatom assemblages, HBIs and TEXL86 in sediment core NBP99-03_10 ...

The West Antarctic ice sheet is particularly sensitive to global warming and its evolution and impact on global climate over the next few decades remains difficult to predict. In this context, investigating past sea ice conditions around Antarctica is of primary importance. Here, we document changes...

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Bibliographic Details
Main Authors: Etourneau, Johan, Collins, L G, Willmott, Verónica, Kim, Jung-Hyun, Barbara, Loïc, Leventer, Amy, Schouten, Stefan, Sinninghe Damsté, Jaap S, Bianchini, A, Klein, Vincent, Crosta, Xavier, Massé, Guillaume
Format: Article in Journal/Newspaper
Language:English
Published: PANGAEA 2013
Subjects:
Piston corer
NBP9903
Nathaniel B. Palmer
Climate Change Learning from the past climate Past4Future
Antarctic
Antarctic Peninsula
Guillaume
Palmer Deep
West Antarctic Ice Sheet
Antarc*
Antarctica
Ice Sheet
Sea ice
Online Access:https://dx.doi.org/10.1594/pangaea.818912
https://doi.pangaea.de/10.1594/PANGAEA.818912
Description
Summary:The West Antarctic ice sheet is particularly sensitive to global warming and its evolution and impact on global climate over the next few decades remains difficult to predict. In this context, investigating past sea ice conditions around Antarctica is of primary importance. Here, we document changes in sea ice presence, upper water column temperatures (0-200 m) and primary productivity over the last 9000 yr BP (before present) in the western Antarctic Peninsula (WAP) margin from a sedimentary core collected in the Palmer Deep Basin. Employing a multi-proxy approach, based on the combination of two biomarkers proxies (highly branched isoprenoid (HBI) alkenes for sea ice and TEXL86 for temperature) and micropaleontological data (diatom assemblages), we derived new Holocene records of sea ice conditions and upper water column temperatures. The early Holocene (9000-7000 yr BP) was characterized by a cooling phase with a short sea ice season. During the mid-Holocene (~7000-3800 yr BP), local climate evolved ... : Supplement to: Etourneau, Johan; Collins, L G; Willmott, Verónica; Kim, Jung-Hyun; Barbara, Loïc; Leventer, Amy; Schouten, Stefan; Sinninghe Damsté, Jaap S; Bianchini, A; Klein, Vincent; Crosta, Xavier; Massé, Guillaume (2013): Holocene climate variations in the western Antarctic Peninsula: evidence for sea ice extent predominantly controlled by changes in insolation and ENSO variability. Climate of the Past, 9(4), 1431-1446 ...

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