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Decreased Northern Hemisphere Precipitation from Consecutive CO2 Doublings Is Associated with Significant AMOC Weakening
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  • Xiyue Zhang,
  • Darryn W. Waugh,
  • Ivan Mitevski,
  • Clara Orbe,
  • Lorenzo M Polvani
Xiyue Zhang
University of Nevada, Reno

Corresponding Author:[email protected]

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Darryn W. Waugh
Johns Hopkins University
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Ivan Mitevski
Princeton University
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Clara Orbe
NASA Goddard Institute for Space Studies
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Lorenzo M Polvani
Columbia University
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Abstract

Previous studies found many climate properties such as northern hemisphere (NH) surface temperature and precipitation respond non-monotonically when CO2 is increased from 1x to 8xCO2 relative to pre-industrial levels. Here, we explore the robustness of the non-monotonicity in NH precipitation response in 11 coupled climate models. Eight models show a decrease of NH precipitation under repeated CO2 doubling beyond a critical level, which varies from 2xCO2 to 8xCO2. These models also show a robust cooling associated with the North Atlantic warming hole, and a prominent weakening in the Atlantic meridional overturning circulation (AMOC) at the same critical CO2 level. The sensitivity of NH precipitation and AMOC to CO2 doublings are positively correlated, especially when the AMOC weakens beyond 10 Sv. Regionally, this decrease in NH precipitation is most prominent over the North Atlantic, Europe and the tropical Pacific.
20 Jun 2024Submitted to ESS Open Archive
21 Jun 2024Published in ESS Open Archive