Rapid northern hemisphere ice sheet melting during the penultimate deglaciation
Stoll, H.M.; Cacho, I.; Gasson, E.; Sliwinski, J.; Kost, O.; Moreno, A.; Iglesias, M.; Torner, J.; Perez-Mejias, C.; Haghipour, N.; Cheng, H.; Edwards, R.L. (2022). Rapid northern hemisphere ice sheet melting during the penultimate deglaciation. Nature Comm. 13(1): 3819. https://dx.doi.org/10.1038/s41467-022-31619-3
In: Nature Communications. Nature Publishing Group: London. ISSN 2041-1723; e-ISSN 2041-1723, meer
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| Auteurs | | Top |
- Stoll, H.M.
- Cacho, I.
- Gasson, E.
- Sliwinski, J.
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- Kost, O.
- Moreno, A.
- Iglesias, M.
- Torner, J.
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- Perez-Mejias, C.
- Haghipour, N.
- Cheng, H.
- Edwards, R.L.
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| Abstract |
The rate and consequences of future high latitude ice sheet retreat remain a major concern given ongoing anthropogenic warming. Here, new precisely dated stalagmite data from NW Iberia provide the first direct, high-resolution records of periods of rapid melting of Northern Hemisphere ice sheets during the penultimate deglaciation. These records reveal the penultimate deglaciation initiated with rapid century-scale meltwater pulses which subsequently trigger abrupt coolings of air temperature in NW Iberia consistent with freshwater-induced AMOC slowdowns. The first of these AMOC slowdowns, 600-year duration, was shorter than Heinrich 1 of the last deglaciation. Although similar insolation forcing initiated the last two deglaciations, the more rapid and sustained rate of freshening in the eastern North Atlantic penultimate deglaciation likely reflects a larger volume of ice stored in the marine-based Eurasian Ice sheet during the penultimate glacial in contrast to the land-based ice sheet on North America as during the last glacial. |
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