Stable carbon and oxygen isotope ratios of planktonic foraminifera from the equatorial Atlantic ...
Carbon isotopic records of nutrient-depleted surface water place constraints on the past fertility of the oceans and on past atmospheric pCO2 levels. The best records of nutrient-depleted delta13C are obtained from planktonic foraminifera living in the thick mixed layers of the western equatorial an...
| Main Authors: | , |
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| Format: | Article in Journal/Newspaper |
| Language: | English |
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PANGAEA
1987
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| Subjects: | |
| Online Access: | https://dx.doi.org/10.1594/pangaea.692012 https://doi.pangaea.de/10.1594/PANGAEA.692012 |
| Summary: | Carbon isotopic records of nutrient-depleted surface water place constraints on the past fertility of the oceans and on past atmospheric pCO2 levels. The best records of nutrient-depleted delta13C are obtained from planktonic foraminifera living in the thick mixed layers of the western equatorial and tropical Atlantic Ocean. We have produced a composite, stacked Globigerinoides sacculifer delta13C record from the equatorial Atlantic, which exhibits significant spectral power at the 100,000- and 41,000-year Milankovitch periods, but no power at the 23,000-year period. Similar to the record presented by Shackleton and Pisias [1985], surface-deep ocean Delta delta13C produced with the G. sacculifer record leads the delta18O ice volume record. However, the glacial-interglacial amplitudes of Delta delta13C differ between our record and Shackleton and Pisias [1985] record. Although large changes in Delta delta13C occur in the equatorial Atlantic during early stages of the last three glacial cycles, surface-deep ... : Supplement to: McIntyre, Andrew; Ruddiman, William F; Karlin, K; Mix, Alan C (1989): Surface water response of the Equatorial Atlantic Ocean to orbital forcing. Paleoceanography, 4(1), 19-55 ... |
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