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Journal Article

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


Lohmann,  Katja
Director’s Research Group OES, The Ocean in the Earth System, MPI for Meteorology, Max Planck Society;

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Ruprich-Robert, Y., Moreno-Chamarro, E., Levine, X., Bellucci, A., Cassou, C., Castruccio, F., et al. (2021). Impacts of Atlantic multidecadal variability on the tropical Pacific: a multi-model study. npj Climate and Atmospheric Science, 4: 33. doi:10.1038/s41612-021-00188-5.

Cite as: http://hdl.handle.net/21.11116/0000-0008-B863-9
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.