Southern Hemisphere and deep-sea warming led deglacial atmospheric CO2 rise and tropical warming
Stott, L.; Timmermann, A.; Thunell, R. (2007). Southern Hemisphere and deep-sea warming led deglacial atmospheric CO2 rise and tropical warming. Science (Wash.) 318(5849): 435-438. https://dx.doi.org/10.1126/science.1143791
In: Science (Washington). American Association for the Advancement of Science: New York, N.Y. ISSN 0036-8075; e-ISSN 1095-9203, more
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| Authors | | Top |
- Stott, L.
- Timmermann, A.
- Thunell, R.
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| Abstract |
Establishing what caused Earth's largest climatic changes in the past requires a precise knowledge of both the forcing and the regional responses. We determined the chronology of high- and low-latitude climate change at the last glacial termination by radiocarbon dating benthic and planktonic foraminiferal stable isotope and magnesium/calcium records from a marine core collected in the western tropical Pacific. Deep-sea temperatures warmed by ∼2°C between 19 and 17 thousand years before the present (ky B.P.), leading the rise in atmospheric CO2 and tropical–surface-ocean warming by ∼1000 years. The cause of this deglacial deep-water warming does not lie within the tropics, nor can its early onset between 19 and 17 ky B.P. be attributed to CO2 forcing. Increasing austral-spring insolation combined with sea-ice albedo feedbacks appear to be the key factors responsible for this warming. |
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