Fast and slow components of interstadial warming in the North Atlantic during the last glacial

Margari, Vasiliki and Skinner, Luke C. and Menviel, Laurie and Capron, Emilie and Rhodes, Rachael H. and Mleneck-Vautravers, Maryline J. and Ezat, Mohamed M. and Martrat, Belen and Grimalt, Joan O. and Hodell, David A. and Tzedakis, Polychronis C. (2020) Fast and slow components of interstadial warming in the North Atlantic during the last glacial. Communications Earth & Environment, 1 (1). ISSN 2662-4435 DOI

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The abrupt nature of warming events recorded in Greenland ice-cores during the last glacial has generated much debate over their underlying mechanisms. Here, we present joint marine and terrestrial analyses from the Portuguese Margin, showing a succession of cold stadials and warm interstadials over the interval 35–57 ka. Heinrich stadials 4 and 5 contain considerable structure, with a short transitional phase leading to an interval of maximum cooling and aridity, followed by slowly increasing sea-surface temperatures and moisture availability. A climate model experiment reproduces the changes in western Iberia during the final part of Heinrich stadial 4 as a result of the gradual recovery of the Atlantic meridional overturning circulation. What emerges is that Greenland ice-core records do not provide a unique template for warming events, which involved the operation of both fast and slow components of the coupled atmosphere–ocean–sea-ice system, producing adjustments over a range of timescales.

Item Type: Article
Uncontrolled Keywords: 2020AREP; IA76
Subjects: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Divisions: 01 - Climate Change and Earth-Ocean Atmosphere Systems
07 - Gold Open Access
Journal or Publication Title: Communications Earth & Environment
Volume: 1
Identification Number:
Depositing User: Sarah Humbert
Date Deposited: 14 Aug 2020 17:30
Last Modified: 14 Aug 2020 17:30

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