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 δO 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 variation...
| Published in: | Science |
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| Main Authors: | , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
American Association for the Advancement of Science (AAAS)
1969
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| Subjects: | |
| Online Access: | http://dx.doi.org/10.1126/science.166.3904.499 https://www.science.org/doi/pdf/10.1126/science.166.3904.499 |
| Summary: | The mean oxygen-18 content of continental ice sheets during the last glacial maximum is estimated to δO 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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