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Ross Ice Shelf Oxygen Isotopes and West Antarctic Climate History

Published online by Cambridge University Press:  20 January 2017

Pieter M. Grootes  and
Minze Stuiver
Pieter M. Grootes
Affiliation:
Quaternary Research Center and Department of Geological Sciences, University of Washington, Seattle, Washington 98195
Minze Stuiver
Affiliation:
Quaternary Research Center and Department of Geological Sciences, University of Washington, Seattle, Washington 98195
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Abstract

The Ross Ice Shelf δ18O profile at station J-9 covers at least the last 30,000 yr. It identifies the depth in the core of ice from (i) the last glacial-interglacial transition (266 to 286 m) and (ii) the 1000-m surface elevation (about 140 m). Various processes contribute to the δ18O change observed in the core: (i) climatic warming, mainly caused by a decrease in winter sea ice extent around Antarctica of about 6° latitude early in the glacial-interglacial transition, (ii) decreasing ice sheet thickness later in the glacial-interglacial transition and during the Holocene, and (iii) decreases in elevation and effective distance from the open ocean as the source of the ice in the core shifts along the flow line toward J-9. Average δ18O values of the last 3000 yr imply a fairly stable climate. Yet shorter (102 to 103 yr) δ18O climatic oscillations up to 6‰ are seen in both the Holocene and the glacial portion of the record.

Type
Research Article
Information
Quaternary Research , Volume 26 , Issue 1 , July 1986 , pp. 49 - 67
Copyright
University of Washington

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