Atlantic Meridional Overturning Circulation Weakening Warmed the Southern Tibetan Plateau in Spring During the 8.2 ka Cold Event

Journal of Geophysical Research Atmospheres, Journal Year: 2025, Volume and Issue: 130(3)

Published: Jan. 31, 2025

Abstract Past North Atlantic abrupt cold events have the potential to provide insights into future climatic response slowdown of meridional overturning circulation (AMOC). This study explores spring temperature changes on southern Tibetan Plateau during 8.2 ka event through simulations forced by freshwater hosing. Simulation results reveal anomalous warming due hosing‐induced AMOC slowdown. was primary caused increase net solar flux and presence an warm anticyclone over Plateau. The enhanced resulted from decrease in snowfall, which led a reduction albedo. snowfall mainly reduced westerly moisture transport, resulting weakened lower‐level westerlies induced AMOC‐driven climate variabilities tropical Indian Ocean. vertical northerly shear southeastern Plateau, diabatic heating released Asian monsoon rainfall. rainfall increased cyclone Mastuno‐Gill Ocean amplified wave train propagating Atlantic, both were weakening is likely play important role recent ongoing amplification

Language: Английский

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Australasian Hydroclimate Response to the Collapse of the Atlantic Meridional Overturning Circulation Under Pre‐Industrial and Last Interglacial Climates

Paleoceanography and Paleoclimatology, Journal Year: 2025, Volume and Issue: 40(3)

Published: March 1, 2025

Abstract Abrupt climate change events during the last glacial period and Last Interglacial (LIG) resulted from changes in Atlantic Meridional Overturning Circulation (AMOC). Over 50 years, there is some evidence that AMOC has weakened, it projected to weaken further or even collapse this century driven by increase atmospheric greenhouse gases. However, impact of an weakening on Australasian hydroclimate still unclear, particularly under a warmer than pre‐industrial (PI). Using ACCESS‐ESM1.5 model, we assess processes impacting seasonal region response shutdown PI LIG climatic conditions. While broad similar both experiments, notable regional differences emerge, highlighting influence background states. During austral summer (DJF), leads drier conditions over Maritime Continent between S N increased precipitation northern Australia weaker LIG. winter (JJA), mid high southern regions New Zealand experience drying boundary conditions, while only southeastern exhibit with northwestern displaying wetter These results underscore complex region‐specific responses disruptions, importance considering states when assessing such impacts.

Language: Английский

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Is scientific reticence hindering climate understanding?

Bulletin of the Atomic Scientists, Journal Year: 2025, Volume and Issue: 81(2), P. 107 - 113

Published: March 4, 2025

Language: Английский

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The Impacts of an AMOC Slowdown on Southern Hemisphere and Australian Climates at 8.2 ka in ACCESS‐ESM1.5 Model

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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Putting the recent 100-year of Asian summer monsoon weakening into context

Science Bulletin, Journal Year: 2025, Volume and Issue: unknown

Published: May 1, 2025

Language: Английский

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Radiocarbon evidence of a North Atlantic intermediate water reconfiguration between the 1960s and 1980s

Earth and Planetary Science Letters, Journal Year: 2024, Volume and Issue: 652, P. 119184 - 119184

Published: Dec. 26, 2024

Language: Английский

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