Late Quaternary sea ice history in the Indian sector of the Southern Ocean as recorded by diatom assemblages.

Crosta, X., Sturm, Arne, Armand, L. and Pichon, J.-J. (2004) Late Quaternary sea ice history in the Indian sector of the Southern Ocean as recorded by diatom assemblages. Marine Micropaleontology, 50 . pp. 209-223. DOI 10.1016/S0377-8398(03)00072-0.

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Abstract

A Modern Analog Technique (MAT5201/31) has been applied to fossil diatom assemblages to provide down-core estimates of February sea-surface temperatures (SSTs) and of sea ice duration over the past 220 000 years at 56°40′S, 160°14′E. At the core location, sea ice progression lagged the SST drop by ∼1 ka at interglacial–glacial transitions, and sea ice retreat was almost synchronous to the SST increase at glacial–interglacial terminations. Sea ice increased continuously during glacial periods to reach its maximum extent at the end of glacial times, although SSTs were almost constant during glacials. This indicates that SSTs are the major parameter determining the advance and retreat of sea ice at transitions, but that the sea ice advance during glacial conditions may be related to positive feedbacks of the ice on albedo, air temperature and meridional wind stress. The strong correlation (r=0.75) between sea ice duration at the core location and the Vostok CO2 record argues for a control of Antarctic sea ice extent on atmospheric CO2 concentration via the modification of the ocean-to-atmosphere gas balance.

Document Type: Article
Keywords: Paleoceanography; Antarctic Ocean; sea ice; diatoms; TASQWA Cruise; SO136
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-P-OZ Paleo-Oceanography
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1016/S0377-8398(03)00072-0
ISSN: 0377-8398
Projects: TASQWA
Expeditions/Models/Experiments:
Date Deposited: 26 Jan 2009 10:20
Last Modified: 21 Jun 2017 12:02
URI: http://oceanrep.geomar.de/id/eprint/1870

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