Impacts of Atlantic multidecadal variability on the tropical Pacific: A multi-model study

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 are uncertain. Analyzing a multi-model set of sensitivity experiments, we find that models differ by a factor of 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 0.26 degrees C AMV warming, the equatorial Pacific cools by 0.11 degrees C with an inter-model standard deviation of 0.03 degrees C.

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Author Ruprich-Robert, Yohan
Moreno-Chamarro, Eduardo
Levine, Xavier
Bellucci, Alessio
Cassou, Christophe
Castruccio, Frederic
Davini, Paolo
Eade, Rosie
Gastineau, Guillaume
Hermanson, Leon
Hodson, Dan
Lohmann, Katja
Lopez-Parages, Jorge
Monerie, Paul-Arthur
Nicolì, Dario
Qasmi, Said
Roberts, Christopher D.
Sanchez-Gomez, Emilia
Danabasoglu, Gokhan
Dunstone, Nick
Martin-Rey, Marta
Msadek, Rym
Robson, Jon
Smith, Doug
Tourigny, Etienne
Publisher UCAR/NCAR - Library
Publication Date 2021-12-01T00:00:00
Digital Object Identifier (DOI) Not Assigned
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Resource Version N/A
Topic Category geoscientificInformation
Progress N/A
Metadata Date 2023-08-18T18:30:35.686538
Metadata Record Identifier edu.ucar.opensky::articles:24439
Metadata Language eng; USA
Suggested Citation Ruprich-Robert, Yohan, Moreno-Chamarro, Eduardo, Levine, Xavier, Bellucci, Alessio, Cassou, Christophe, Castruccio, Frederic, Davini, Paolo, Eade, Rosie, Gastineau, Guillaume, Hermanson, Leon, Hodson, Dan, Lohmann, Katja, Lopez-Parages, Jorge, Monerie, Paul-Arthur, Nicolì, Dario, Qasmi, Said, Roberts, Christopher D., Sanchez-Gomez, Emilia, Danabasoglu, Gokhan, Dunstone, Nick, Martin-Rey, Marta, Msadek, Rym, Robson, Jon, Smith, Doug, Tourigny, Etienne. (2021). Impacts of Atlantic multidecadal variability on the tropical Pacific: A multi-model study. UCAR/NCAR - Library. http://n2t.net/ark:/85065/d7445qw0. Accessed 18 July 2025.

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