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Data from: The impacts of an AMOC slowdown on Southern Hemisphere and Australian climates at 8.2 ka in ACCESS-ESM1.5 model

Du, Yanxuan1; Brown, Josephine1; Menviel, Laurie2; Saini, Himadri2; Drysdale, Russell1

Published Apr 10, 2025 on Dryad. https://doi.org/10.5061/dryad.8pk0p2nxj

Data files

Apr 10, 2025 version files 1.43 GB

Abstract

Greenland ice cores reveal an abrupt cooling of up to 3.3°C 8.2 kyr ago (8.2 ka), lasting for roughly 160 years. The event was likely caused by a weakening of the Atlantic Meridional Overturning Circulation (AMOC) due to freshwater drainage into the North Atlantic. It was associated with a global-scale climate change but is recorded in very few high-resolution paleoclimatic time series from the Southern Hemisphere (SH). Here, we investigate the 8.2 ka event in the SH, particularly the Australian climate response to a weakened AMOC. Five North Atlantic meltwater experiments are conducted with the Australian Earth System Model, ACCESS-ESM1.5, to evaluate the sensitivity of AMOC responses to freshwater perturbations under early Holocene conditions as well as their climate impact.