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Southern Ocean upwelling, Earth's obliquity, and glacial-interglacial atmospheric CO2 change


Science for just $15 USD.
Controlling atmospheric carbon dioxide
The atmospheric concentration of carbon dioxide (CO
2) has varied substantially over the past million years in tandem with the glacial cycle. Although it is widely agreed that upwelling of Southern Ocean water is a key factor, the finer details about what caused these CO
2 variations are of great importance for understanding climate. Ai
et al. identified three modes of change in Southern Ocean upwelling, adding a third to two previously recognized ones. This new mode can help explain better the relative timing of the glacial and CO
2 cycles.
Abstract
Previous studies have suggested that during the late Pleistocene ice ages, surface-deep exchange was somehow weakened in the Southern Ocean’s Antarctic Zone, which reduced the leakage of deeply sequestered carbon dioxide and thus contributed to the lower atmospheric carbon dioxide levels of the ice ages. Here, high-resolution diatom-bou ....

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