Sedimentological investigations and age model on sediment core PS2561-2 ...

Benthic d13C values (F. wuellerstorfi), kaolinite/chlorite ratios and sortable silt median grain sizes in sediments of a core from the abyssal Agulhas Basin record the varying impact of North Atlantic Deep Water (NADW) and Antarctic Bottom Water (AABW) during the last 200 ka. The data indicate that...

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Bibliographic Details
Main Authors: Krüger, Stefan, Leuschner, Dirk C, Ehrmann, Werner, Schmiedl, Gerhard, Mackensen, Andreas
Format: Article in Journal/Newspaper
Language:English
Published: PANGAEA 2012
Subjects:
Gravity corer Kiel type
ANT-XI/4
Polarstern
Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas SPP1158
Agulhas Basin
Antarctic
Arctic
The Antarctic
Weddell
Weddell Sea
Antarc*
Ice Shelf
Ice Shelves
NADW
North Atlantic Deep Water
North Atlantic
Sea ice
Online Access:https://dx.doi.org/10.1594/pangaea.774847
https://doi.pangaea.de/10.1594/PANGAEA.774847
Description
Summary:Benthic d13C values (F. wuellerstorfi), kaolinite/chlorite ratios and sortable silt median grain sizes in sediments of a core from the abyssal Agulhas Basin record the varying impact of North Atlantic Deep Water (NADW) and Antarctic Bottom Water (AABW) during the last 200 ka. The data indicate that NADW influence decreased during glacials and increased during interglacials, in concert with the global climatic changes of the late Quaternary. In contrast, AABW displays a much more complex behaviour. Two independent modes of deep-water formation contributed to the AABW production in the Weddell Sea: 1) brine rejection during sea ice formation in polynyas and in the sea ice zone (Polynya Mode) and 2) super-cooling of Ice Shelf Water (ISW) beneath the Antarctic ice shelves (Ice Shelf Mode). Varying contributions of the two modes lead to a high millennial-scale variability of AABW production and export to the Agulhas Basin. Highest rates of AABW production occur during early glacials when increased sea ice ... : see also doi:10.1594/PANGAEA.774777 for data of core PS2561-2 used by this study. ...

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