Characterizing Atlantic interhemispheric teleconnection established by South American monsoon in austral summer

This study aims to characterize the interhemispheric teleconnection pattern, which is established by the South America (SA) summer monsoon over the Atlantic Ocean during January and February, and referred it as the Atlantic symmetric pattern (ASP). The ASP is characterized using the leading mode of...

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Bibliographic Details
Published in:Environmental research letters 2023-07, Vol.18 (7), p.74003
Main Authors: Tseng, Wan-Ling, Lee, Yu-Chi, Wang, Yi-Chi, Hsu, Huang-Hsiung, Keenlyside, Noel
Format: Article
Language:English
Subjects:
Atlantic Ocean
atmospheric-ocean-convection coupling
Cerebral hemispheres
Dipoles
interhemispheric teleconnection
Monsoons
Northern Hemisphere
Oceanic convection
Sea surface temperature
South American summer monsoon
Summer
Teleconnections
Wave packets
Wind
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Summary:This study aims to characterize the interhemispheric teleconnection pattern, which is established by the South America (SA) summer monsoon over the Atlantic Ocean during January and February, and referred it as the Atlantic symmetric pattern (ASP). The ASP is characterized using the leading mode of interannual sea surface temperature (SST) variability of the Southwest Atlantic Ocean, where strong convection-SST coupling occurs. The pattern is manifested as two anomalous cyclonic-anticyclonic-cyclonic circulation trains aligned meridionally over the Atlantic Ocean, with a distinct SST dipole of the Southwest Atlantic Ocean and a tripole of the North Atlantic Ocean. The interhemispheric wave trains of the ASP are excited as a Gill-type response to convective activity in the SA summer monsoon, as confirmed in linear baroclinic model. Complementing previous studies on observed interhemispheric connection in the Atlantic, our findings highlight the importance of characterizing the ASP and its role in linking the South Atlantic SST, the SA summer monsoon, and North Atlantic climate. Further research is warranted to explore the impacts of the ASP on the Northern Hemisphere and its interactions with other climatic modes.
ISSN:1748-9326
1748-9326
DOI:10.1088/1748-9326/acdbdf