Glacier Oxygen-18 Content and Pleistocene Ocean Temperatures

The mean oxygen-18 content of continental ice sheets during the last glacial maximum is estimated to $\delta $O$^{18}$ = -30 per mille or less, and the consequent change in the isotopic composition of the oceans at that time to 1.2 per mille or more. This means that at least 70 percent of the oxygen...

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Published inScience (American Association for the Advancement of Science) Vol. 166; no. 3904; pp. 499 - 502
Main Authors Dansgaard, W., Tauber, Henrik
Format Journal Article
LanguageEnglish
Published United States American Association for the Advancement of Science 24.10.1969
Subjects
Antarctic regions
Continental glaciers
Glaciation
Glaciers
Ice
Ice sheets
Methane
Sea water
Seamounts
Surface water
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Summary:The mean oxygen-18 content of continental ice sheets during the last glacial maximum is estimated to $\delta $O$^{18}$ = -30 per mille or less, and the consequent change in the isotopic composition of the oceans at that time to 1.2 per mille or more. This means that at least 70 percent of the oxygen-18 variations found in shells of planktonic foraminifera from deep-sea cores between times of glacial maximums and minimums are due to isotopic changes in ocean water, and at most 30 percent to changes in ocean surface temperature. Hence, Emiliani's "paleotemperature" curve rather depicts the amount of ice on the continents in excess of that present today. In this sense it may be renamed a "paleoglaciation" curve.
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ISSN:0036-8075
1095-9203
DOI:10.1126/science.166.3904.499