EGU21-3477
https://doi.org/10.5194/egusphere-egu21-3477
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Impacts of Atlantic Multidecadal Variability on the Tropical Pacific: a multi-model study

Yohan Ruprich-Robert1 and the the AMV - Tropical Pacific study team*
Yohan Ruprich-Robert and the the AMV - Tropical Pacific study team
  • 1BSC, Earth Sciences, Barcelona, Spain (yohan.ruprich@bsc.es)
  • *A full list of authors appears at the end of the abstract

The Atlantic Multidecadal Variability (AMV) has been linked to the observed slowdown of global warming over 1998-2012 through its impact on the tropical Pacific. Given the global importance of tropical Pacific variability, better understanding this Atlantic-Pacific teleconnection is key for improving climate predictions, but the robustness and strength of this link is uncertain. Analysing a multi-model set of sensitivity experiments, we find that models differ by a factor 10 in simulating the amplitude of the Equatorial Pacific cooling response to observed AMV warming. The inter-model spread is mainly driven by different amounts of moist static energy injection from the tropical Atlantic surface into the upper troposphere. We reduce this inter-model uncertainty by analytically correcting models for their mean precipitation biases and we quantify that, following an observed 0.26ºC AMV warming, the equatorial Pacific cools by 0.16ºC with an inter-model standard deviation of 0.03ºC.

the AMV - Tropical Pacific study team:

Yohan Ruprich-Robert; Eduardo Moreno-Chamarro; Xavier Levine; Alessio Belucci; Christophe Cassou; Frederic Castruccio; Paolo Davini; Rosie Eade; Guillaume Gastineau; Leon Hermanson; Dan Hodson; Katja Lohmann; Jorge Lopez-Parages; Paul-Arthur Monerie; Dario Nicolì; Said Qasmi; Chris Roberts; Emilia Sanchez-Gomez; Gokhan Danabasoglu; Nick Dunstone; Marta Martin-Rey; Rym Msadek; Jon Robson; Doug Smith; Etienne Tourigny

How to cite: Ruprich-Robert, Y. and the the AMV - Tropical Pacific study team: Impacts of Atlantic Multidecadal Variability on the Tropical Pacific: a multi-model study, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-3477, https://doi.org/10.5194/egusphere-egu21-3477, 2021.