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Impact of the Indo-Pacific Warm Pool on the Hadley, Walker, and Monsoon Circulations

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Title
Impact of the Indo-Pacific Warm Pool on the Hadley, Walker, and Monsoon Circulations
Author(s)
Kim, Hye-Ryeom; Kyung-Ja Ha; Suyeon Moon; Oh, Hyoeun; Sahil Sharma
Publication Date
2020-10
Journal
ATMOSPHERE, v.11, no.10
Publisher
MDPI
Abstract
The Indo-Pacific warm pool (IPWP) is enclosed by a 28 degrees C isotherm and plays a vital role in controlling atmospheric circulations. However, the effects of changes in regional warm pool sea surface temperatures (SSTs) remain unexplored. We divided the IPWP into the Indian and Pacific sectors and distinguished their responses to natural variability and global warming. Furthermore, we examined the impacts of the interannual variability (IAV) in warm pool SST on the tropical Hadley, Walker, and monsoon circulations. The Hadley circulation was affected by warm pool SST warming, i.e., warmer SSTs over the warm pool strengthened the upward branch of Hadley circulation, whereas the downward branch was respectively weakened and strengthened in the Northern and Southern Hemispheres. Walker circulation was strengthened (weakened) in the warming (natural) mode. Consequently, the Walker circulation is weakened since the natural variability of warm pool SST plays a more dominant role rather than the warming trend of SSTs over the warm pool. Furthermore, our analysis displays that warm pool warming has little impact on the monsoon circulation. Our findings highlight the different roles of the IAV of warm pool regions in each tropical circulation as part of the warming trend and natural variability.
URI
https://pr.ibs.re.kr/handle/8788114/10565
DOI
10.3390/atmos11101030
ISSN
2073-4433
Appears in Collections:
Center for Climate Physics(기후물리 연구단) > 1. Journal Papers (저널논문)
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