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- Title
Rapid northern hemisphere ice sheet melting during the penultimate deglaciation.
- Authors
Stoll, Heather M.; Cacho, Isabel; Gasson, Edward; Sliwinski, Jakub; Kost, Oliver; Moreno, Ana; Iglesias, Miguel; Torner, Judit; Perez-Mejias, Carlos; Haghipour, Negar; Cheng, Hai; Edwards, R. Lawrence
- 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. Stalagmites from NW Iberia record the rapid demise of large ice sheets during the penultimate deglaciation, and reveal decadal-scale feedbacks between warming and ice melting.
- Subjects
IBERIAN Peninsula; ICE sheet thawing; ICE sheets; GLACIAL melting; ATMOSPHERIC temperature; STALACTITES &; stalagmites
- Publication
Nature Communications, 2022, Vol 13, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-022-31619-3