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

International audience A Modern Analog Technique (MAT 5 201/31) 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 ‡40PS, 160 ‡14PE. At the core location, sea ice progressi...

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Bibliographic Details
Published in:Marine Micropaleontology
Main Authors: Crosta, Xavier, Sturm, Arne, Armand, Leanne, Pichon, Jean-Jacques
Other Authors: Environnements et Paléoenvironnements OCéaniques (EPOC), Observatoire aquitain des sciences de l'univers (OASU), Université Sciences et Technologies - Bordeaux 1-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-École pratique des hautes études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), Department of Biological Sciences North Ryde, Macquarie University
Format: Article in Journal/Newspaper
Language:English
Published: HAL CCSD 2004
Subjects:
diatoms
sea ice
Paleoceanography
Antarctic Ocean
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean
Atmosphere
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography
[SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology
Antarctic
Indian
Southern Ocean
Antarc*
Sea ice
Online Access:https://hal.archives-ouvertes.fr/hal-02105703
https://doi.org/10.1016/S0377-8398(03)00072-0
Description
Summary:International audience A Modern Analog Technique (MAT 5 201/31) 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 ‡40PS, 160 ‡14PE. At the core location, sea ice progression lagged the SST drop by V1 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 CO 2 record argues for a control of Antarctic sea ice extent on atmospheric CO 2 concentration via the modification of the ocean-to-atmosphere gas balance. ß

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