Rapid northern hemisphere ice sheet melting during the penultimate deglaciation

Heather M. Stoll (), Isabel Cacho, Edward Gasson, Jakub Sliwinski, Oliver Kost, Ana Moreno, Miguel Iglesias, Judit Torner, Carlos Perez-Mejias, Negar Haghipour, Hai Cheng and R. Lawrence Edwards
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Heather M. Stoll: ETH Zürich
Isabel Cacho: Universitat de Barcelona
Edward Gasson: University of Bristol
Jakub Sliwinski: ETH Zürich
Oliver Kost: ETH Zürich
Ana Moreno: Pyrenean Institute of Ecology-CSIC
Miguel Iglesias: University of Oviedo
Judit Torner: Universitat de Barcelona
Carlos Perez-Mejias: Xi’an Jiaotong University
Negar Haghipour: ETH Zürich
Hai Cheng: Xi’an Jiaotong University
R. Lawrence Edwards: University of Minnesota

Nature Communications, 2022, vol. 13, issue 1, 1-16

Abstract: 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.

Date: 2022
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DOI: 10.1038/s41467-022-31619-3

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