The Impacts of an AMOC Slowdown on Southern Hemisphere and Australian Climates at 8.2 ka in ACCESS‐ESM1.5 Model DOI Creative Commons
Yanxuan Du, Josephine R. Brown, Laurie Menviel

et al.

Journal of Geophysical Research Atmospheres, Journal Year: 2025, Volume and Issue: 130(8)

Published: April 16, 2025

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 the Atlantic Meridional Overturning Circulation (AMOC) due freshwater drainage into North Atlantic. It associated with global‐scale climate change but is recorded in very few high‐resolution paleoclimatic time series from Southern Hemisphere (SH). In this study, we investigate ka SH, particularly Australian response weakened AMOC. Five meltwater experiments are conducted Earth System Model, ACCESS‐ESM1.5, evaluate sensitivity AMOC responses perturbations under early Holocene conditions as well their impact. Our results suggest 100 year pulse reproduces global that best matches existing proxy records event. surface air temperatures show significant cooler northern half continent warmer anomalies south hydroclimate displays more complex at ka. Northern precipitation influenced southward shift mean position Intertropical Convergence Zone and strengthened Indo‐Australian summer monsoon, while southern part sensitive winter westerly winds. These highlight importance understanding different background order better predict potential future impacts.

Language: Английский

The Impacts of an AMOC Slowdown on Southern Hemisphere and Australian Climates at 8.2 ka in ACCESS‐ESM1.5 Model DOI Creative Commons
Yanxuan Du, Josephine R. Brown, Laurie Menviel

et al.

Journal of Geophysical Research Atmospheres, Journal Year: 2025, Volume and Issue: 130(8)

Published: April 16, 2025

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 the Atlantic Meridional Overturning Circulation (AMOC) due freshwater drainage into North Atlantic. It associated with global‐scale climate change but is recorded in very few high‐resolution paleoclimatic time series from Southern Hemisphere (SH). In this study, we investigate ka SH, particularly Australian response weakened AMOC. Five meltwater experiments are conducted Earth System Model, ACCESS‐ESM1.5, evaluate sensitivity AMOC responses perturbations under early Holocene conditions as well their impact. Our results suggest 100 year pulse reproduces global that best matches existing proxy records event. surface air temperatures show significant cooler northern half continent warmer anomalies south hydroclimate displays more complex at ka. Northern precipitation influenced southward shift mean position Intertropical Convergence Zone and strengthened Indo‐Australian summer monsoon, while southern part sensitive winter westerly winds. These highlight importance understanding different background order better predict potential future impacts.

Language: Английский

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