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Communication Dans Un Congrès Année : 2022

AMOC thresholds in CMIP6 models: NAHosMIP

Laura Jackson
  • Fonction : Auteur
Eduardo Alastrue-De-Asenjo
  • Fonction : Auteur
Katinka Bellomo
  • Fonction : Auteur
Gokhan Danabasoglu
  • Fonction : Auteur
Aixue Hu
  • Fonction : Auteur
Johann Jungclaus
  • Fonction : Auteur
Virna Meccia
  • Fonction : Auteur
Oleg Saenko
  • Fonction : Auteur
Andrew Shao
  • Fonction : Auteur

Résumé

The Atlantic meridional overturning circulation (AMOC) is an important part of our climate system, which keeps the North Atlantic relatively warm. It is predicted to weaken under climate change. The AMOC may have a tipping point beyond which recovery is difficult, hence showing quasi-irreversibility (hysteresis). Although hysteresis has been seen in simple models, it has been difficult to demonstrate in comprehensive global climate models. We present initial results from the North Atlantic hosing model intercomparison project, where we applied an idealised forcing of a freshwater flux over the North Atlantic in 9 CMIP6 models. The AMOC weakens in all models from the freshening, but once the freshening ceases, the AMOC recovers in some models, and in others it stays in a weakened state. We discuss how differences in feedbacks affect the AMOC response.

Dates et versions

hal-03869321 , version 1 (02-12-2022)

Identifiants

Citer

Laura Jackson, Eduardo Alastrue-De-Asenjo, Katinka Bellomo, Gokhan Danabasoglu, Aixue Hu, et al.. AMOC thresholds in CMIP6 models: NAHosMIP. EGU General Assembly 2022, May 2022, Vienne, Austria. ⟨10.5194/egusphere-egu22-2778⟩. ⟨hal-03869321⟩

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