The Relationships Between Meridional Position of North Pacific Sea Surface Temperature Anomalies and North American Surface Temperatures Revealed by CMIP6 Models

Abstract In this study, we obtained the first leading mode and principal component 1 (PC1) of North Pacific sea surface temperature (SST). The PC1‐related SST anomalies, located relatively north/south, are referred to as North/South PC1 events. Model outputs, observations, reanalysis datasets and se...

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Bibliographic Details
Published in:Geophysical Research Letters
Main Authors: Tao Wang, Xiaohua Gou, Wenshou Tian, Xuejia Wang, Fei Xie
Format: Article in Journal/Newspaper
Language:English
Published: Wiley 2023
Subjects:
north Pacific
sea surface temperature
atmospheric circulation
surface temperature
Geophysics. Cosmic physics
QC801-809
aleutian low
Online Access:https://doi.org/10.1029/2022GL102096
https://doaj.org/article/db25db0711c940958264a97c482b9eeb
Description
Summary:Abstract In this study, we obtained the first leading mode and principal component 1 (PC1) of North Pacific sea surface temperature (SST). The PC1‐related SST anomalies, located relatively north/south, are referred to as North/South PC1 events. Model outputs, observations, reanalysis datasets and sensitivity experiments show that during the North PC1 events, an enhanced Aleutian low occurs and is located relatively north, favoring anomalous southerlies over western North America. The anomalous southerlies induce a strong warming anomaly over North America via warm advection of the anomalous southerlies and temperature advection of the climatological westerlies over North America. However, the Aleutian low anomaly and corresponding southerly anomaly associated with South PC1 events shift southward, favoring weakened effects of South PC1 events on atmospheric circulations and surface temperatures over North America. The meridional position of PC1 events deserves to be considered in the studies of the PC1 and its related climate changes.

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