Role of SST in Seasonal Western North Pacific Anomalous Anticyclone: Insights From AMIP Simulations in CMIP6

Abstract The western North Pacific anticyclone (WNPAC) significantly influences the East Asian climate and is modulated by tropical sea surface temperature (SST). This study uses 142 AMIP simulations from 33 Coupled Model Intercomparison Project (CMIP6) models to quantify the contributions of SST to...

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Bibliographic Details
Published in:Geophysical Research Letters
Main Authors: Shuyan Wu, Wenshi Lin, Lu Dong, Fengfei Song, Song Yang, Zhiyuan Lu, Xiaoming Hu
Format: Article in Journal/Newspaper
Language:English
Published: Wiley 2024
Subjects:
Geophysics. Cosmic physics
QC801-809
Indian
Pacific
North Atlantic
Online Access:https://doi.org/10.1029/2023GL107080
https://doaj.org/article/5dbce05cb70b42d9b5d28e01079ae440
Description
Summary:Abstract The western North Pacific anticyclone (WNPAC) significantly influences the East Asian climate and is modulated by tropical sea surface temperature (SST). This study uses 142 AMIP simulations from 33 Coupled Model Intercomparison Project (CMIP6) models to quantify the contributions of SST to the interannual variability of the WNPAC. SST forcing accounts for 66%, 77%, and 49% of the WNPAC variance in winter, spring, and summer, respectively. The persistence of the WNPAC depends on the relaying effects of SST in three tropical oceans. CMIP6 models exhibit excessive precipitation response to the Pacific SST, leading to an overestimated (underestimated) Pacific (Indian Ocean) effect in modulating the summer WNPAC. Sensitivity experiments with an atmospheric model confirm the crucial role of the Pacific in regulating the WNPAC interannual variation and the contribution from the tropical North Atlantic in spring. The tropical Indian Ocean only exerts a minor impact on the WNPAC when excluding the interactions with other oceans.

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