Sea ice extent and seasonality for the Early Pliocene northern Weddell Sea

Growth increment analysis coupled with stable isotopic data (δ18O/δ13C) from Early Pliocene (ca 4.7 Ma) Austrochlamys anderssoni from shallow marine sediments of the Cockburn Island Formation, northern Antarctic Peninsula, suggest these bivalves grew through much of the year, even during the coldest...

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Bibliographic Details
Published in:Palaeogeography, Palaeoclimatology, Palaeoecology
Main Authors: Williams, Mark, Nelson-Laloë, Anna E., Smellie, John L., Leng, Melanie J., Johnson, Andrew L.A., Jarram, Daniel R., Haywood, Alan M., Peck, Victoria L., Zalasiewicz, Jan, Bennett, Carys, Schöne, Bernd R.
Format: Article in Journal/Newspaper
Language:English
Published: Elsevier 2010
Subjects:
Antarctic
Antarctic Peninsula
Cockburn
Cockburn Island
The Antarctic
Weddell
Weddell Sea
Antarc*
Sea ice
Online Access:http://nora.nerc.ac.uk/id/eprint/9993/
https://nora.nerc.ac.uk/id/eprint/9993/1/Williams_et_al_Antarctic_bivalves_%282%29.pdf
http://www.sciencedirect.com/science/journal/00310182
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Summary:Growth increment analysis coupled with stable isotopic data (δ18O/δ13C) from Early Pliocene (ca 4.7 Ma) Austrochlamys anderssoni from shallow marine sediments of the Cockburn Island Formation, northern Antarctic Peninsula, suggest these bivalves grew through much of the year, even during the coldest parts of winter recorded in the shells. The high frequency fluctuation in growth increment width of A. anderssoni appears to reflect periodic, but year-round, agitation of the water column enhancing benthic food supply from organic detritus. This suggests that Austrochlamys favoured waters that were largely sea ice free. Our data support interpretation of the Cockburn Island Formation as an interglacial marine deposit and the previous hypothesis that Austrochlamys retreated from the Antarctic as sea ice extent expanded, this transition occurring during climate cooling in the Late Pliocene.

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