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The relative roles of the South China Sea summer monsoon and ENSO in the Indian Ocean dipole development

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Title
The relative roles of the South China Sea summer monsoon and ENSO in the Indian Ocean dipole development
Author(s)
Zhang, Yazhou; Li, Jianping; Xue, Jiaqing; Zheng, Fei; Wu, Renguang; Kyung-Ja Ha; Feng, Juan
Publication Date
2019-12
Journal
CLIMATE DYNAMICS, v.53, no.11, pp.6665 - 6680
Publisher
SPRINGER
Abstract
The influence of El Nino-Southern Oscillation (ENSO) on the Indian Ocean Dipole (IOD), a coupled ocean-atmosphere mode of interannual climate variability, has been widely investigated over recent decades. However, a latest study indicates that the South China Sea summer monsoon (SCSSM) might also be responsible for IOD formation. Furthermore, an abnormal SCSSM does not always coincide with ENSO during boreal summer (June-August, JJA); consequently, the individual and combined effects of the SCSSM and ENSO on the IOD remain elusive. This study shows that the amplitude of the IOD tends to be much stronger under the coexistence of SCSSM and ENSO than that under individual SCSSM or ENSO events during JJA and autumn. The findings also indicate that the SCSSM and ENSO play the dominant role around the eastern and western poles of the IOD, respectively. An anomalous local Hadley circulation closely related to the stronger SCSSM favors anomalous southeasterly off Sumatra and Java during JJA, which enhance oceanic upwelling and subsequently result in cooling of the sea surface temperature (SST) over this area. Similarly, it can be envisaged that the contemporaneous ENSO could influence JJA SST anomalies over the western Indian Ocean via the Walker circulation coupled with oceanic variations.
URI
https://pr.ibs.re.kr/handle/8788114/10576
DOI
10.1007/s00382-019-04953-4
ISSN
0930-7575
Appears in Collections:
Center for Climate Physics(기후물리 연구단) > 1. Journal Papers (저널논문)
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