CO/sub 2/ and Northern Hemisphere ice volume variations over the Middle and Late Quaternary
The atmospheric CO/sub 2/ concentrations have been reconstructed over the past 600 ka based on regression between the Vostok CO/sub 2/ data and the SPECMAP oxygen isotope values. A lag of 4.5 ka (CO/sub 2/ preceding delta /sup 18/O) gives the best results. A polynomial of order 5 explains 66% of the...
| Published in: | Climate Dynamics |
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| Main Authors: | , , |
| Other Authors: | |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
Springer-verlag
1998
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| Subjects: | |
| Online Access: | http://hdl.handle.net/2078.1/66254 https://doi.org/10.1007/s003820050240 |
| Summary: | The atmospheric CO/sub 2/ concentrations have been reconstructed over the past 600 ka based on regression between the Vostok CO/sub 2/ data and the SPECMAP oxygen isotope values. A lag of 4.5 ka (CO/sub 2/ preceding delta /sup 18/O) gives the best results. A polynomial of order 5 explains 66% of the Vostok CO/sub 2/ variance over the last 220 ka. The Northern Hemisphere ice-sheet volume was simulated over the past 575 ka using the LLN 2-D model, forced by insolation and these statistically reconstructed atmospheric CO/sub 2/ concentrations. The simulated ice volume fluctuations resemble the deep-sea oxygen isotope variations. CO/sub 2 / of interglacial level is necessary for explaining both the interglacial at oxygen isotopic stage 11 and our present-day interglacial. Anglais |
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