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Variable sequence of events during the past seven terminations in two deep-sea cores from the Southern Ocean

Published online by Cambridge University Press:  20 January 2017

Aya Schneider Mor ,
Ruth Yam ,
Cristina Bianchi ,
Martina Kunz-Pirrung ,
Rainer Gersonde  and
Aldo Shemesh
Aya Schneider Mor*
Affiliation:
Weizmann Institute of Science, P.O. Box 26, 76100 Rehovot, Israel
Ruth Yam
Affiliation:
Weizmann Institute of Science, P.O. Box 26, 76100 Rehovot, Israel
Cristina Bianchi
Affiliation:
Alfred Wegener Institute for Polar and Marine Research, P.O. Box 120161 Columbusstrasse, 27515 Bremerhaven, Germany
Martina Kunz-Pirrung
Affiliation:
Alfred Wegener Institute for Polar and Marine Research, P.O. Box 120161 Columbusstrasse, 27515 Bremerhaven, Germany
Rainer Gersonde
Affiliation:
Alfred Wegener Institute for Polar and Marine Research, P.O. Box 120161 Columbusstrasse, 27515 Bremerhaven, Germany
Aldo Shemesh
Affiliation:
Weizmann Institute of Science, P.O. Box 26, 76100 Rehovot, Israel
*
*Corresponding author at: Stanford University, 367 Panama St., Stanford, CA 94305, USA. E-mail address:ayaschm@stanford.edu (A. Schneider Mor).
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Abstract

The relationships among internally consistent records of summer sea-surface temperature (SSST), winter sea ice (WSI), and diatomaceous stable isotopes were studied across seven terminations over the last 660 ka in sedimentary cores from ODP sites 1093 and 1094. The sequence of events at both sites indicates that SSST and WSI changes led the carbon and nitrogen isotopic changes in three Terminations (TI, TII and TVI) and followed them in the other four Terminations (TIII, TIV, TV and TVII). In both TIII and TIV, the leads and lags between the proxies were related to weak glacial mode, while in TV and TVII they were due to the influence of the mid-Pleistocene transition. We show that the sequence of events is not unique and does not follow the same pattern across terminations, implying that the processes that initiated climate change in the Southern Ocean has varied through time.

Keywords

TerminationSequence of eventsSouthern OceanDiatomCarbon and nitrogen isotopesGlacial–interglacial

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Type
Original Articles
Information
Quaternary Research , Volume 77 , Issue 2 , March 2012 , pp. 317 - 325
Copyright
University of Washington

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