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Non-monotonic responses of Atlantic Meridional Overturning Circulation to Antarctic meltwater forcing
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  • Yechul Shin,
  • Xin Geng,
  • Ji-Hoon Oh,
  • Kyung Min Noh,
  • Emilia Kyung Jin,
  • Jong-Seong Kug
Yechul Shin
Pohang University of Science and Technology
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Xin Geng
Nanjing University of Information Science & Technology
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Ji-Hoon Oh
Pohang University of Science and Technology (POSTECH)
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Kyung Min Noh
POSTECH
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Emilia Kyung Jin
Korea Polar Research Institute
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Jong-Seong Kug
POSTECH

Corresponding Author:[email protected]

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Abstract

Antarctic meltwater discharge has been largely emphasized for its potential role in climate change mitigation, not only by reducing global warming, but also by stabilizing the Atlantic Meridional Overturning Circulation (AMOC). Despite the tremendous impact of the AMOC on the climate system, its temporal evolution to the meltwater remains poorly understood. In this study, we conduct idealized experiments to investigate the response of AMOC to Antarctic meltwater and discover a non-monotonic response of AMOC to the meltwater-induced cooling. Cold ocean surface caused by meltwater spread throughout the globe and eventually strengthened the AMOC. However, in the early stages, the tropical temperature response could stimulate the Rossby wave teleconnection, modulating atmospheric circulation in the North Atlantic, and weakening convection and even the AMOC. This counterintuitive evolution implies a potential destabilizing effect of Antarctic meltwater, and thus highlights the importance of the atmospheric dynamics in the interaction between the two poles.
05 Nov 2023Submitted to ESS Open Archive
08 Nov 2023Published in ESS Open Archive