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AMOC decline and recovery in a warmer climate
Paulo Nobre1, Sandro F Veiga2, Emanuel Giarolla3
1Center for Weather Forecasting and Climate Studies (CPTEC), National Institute for Space Research (INPE), Cachoeira Paulista, São Paulo, 12630-000, Brazil. paulo.nobre@inpe.br.
Scientific Reports
|September 23, 2023
Summary
Arctic sea ice melt triggers Atlantic Meridional Overturning Circulation (AMOC) reduction. Recovery occurs through altered ocean processes in a warmer climate, leading to a permanently changed AMOC system.
Area of Science:
- Climate Science
- Oceanography
- Arctic Studies
Background:
- The Atlantic Meridional Overturning Circulation (AMOC) is a critical component of Earth's climate system.
- Understanding AMOC's response to climate change is vital for predicting future climate scenarios.
- Previous research indicates potential sensitivity of AMOC to freshwater influxes.
Purpose of the Study:
- To investigate the mechanisms driving Atlantic Meridional Overturning Circulation (AMOC) reduction.
- To explore the recovery processes of AMOC under a warmer climate.
- To elucidate the role of Arctic sea ice melt in AMOC dynamics.
Main Methods:
- Conducted a one-thousand-year-long numerical simulation using a global coupled ocean-ice-atmosphere climate model.
- Applied stationary atmospheric radiative forcing to the model.
- Analyzed changes in sea ice, freshwater and heat fluxes, and ocean stratification.
Main Results:
- Arctic sea ice melting was identified as the primary trigger for initial AMOC reduction.
- Observed significant decreases in northward salt and heat fluxes.
- Identified atmospheric-driven ocean processes leading to erosion of North Atlantic surface layer stratification.
Conclusions:
- Arctic sea ice melt initiates AMOC reduction by altering surface ocean properties.
- Ocean stratification changes play a key role in the subsequent recovery and permanent alteration of AMOC.
- The study provides novel insights into AMOC's complex response to warming.
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