气候变化领域集成服务门户(CCPortal): The Extreme Positive Indian Ocean Dipole of 2019 and Associated Indian Summer Monsoon Rainfall Response

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DOI	10.1029/2020GL091497
	The Extreme Positive Indian Ocean Dipole of 2019 and Associated Indian Summer Monsoon Rainfall Response
	Ratna S.B.; Cherchi A.; Osborn T.J.; Joshi M.; Uppara U.
发表日期	2021
ISSN	0094-8276
卷号	48 期号:2
英文摘要	The positive Indian Ocean Dipole (IOD) event in 2019 was among the strongest on record, while the Indian Summer monsoon (ISM) was anomalously dry in June then very wet by September. We investigated the relationships between the IOD, Pacific sea surface temperature (SST), and ISM rainfall during 2019 with an atmospheric general circulation model forced by observed SST anomalies. The results show that the extremely positive IOD was conducive to a wetter-than-normal ISM, especially late in the season when the IOD strengthened and was associated with anomalous low-level divergence over the eastern equatorial Indian Ocean and convergence over India. However, a warm SST anomaly in the central equatorial Pacific contributed to low-level divergence and decreased rainfall over India in June. These results help to better understand the influence of the tropical SST anomalies on the seasonal evolution of ISM rainfall during extreme IOD events. © 2020. The Authors.
英文关键词	Atmospheric thermodynamics; Rain; Surface waters; Atmospheric general circulation models; Eastern equatorial Indian ocean; Equatorial Pacific; Indian Ocean dipole; Indian ocean dipoles; Indian summer monsoon; Indian summer monsoon rainfall; Sea surface temperature (SST); Oceanography
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169196
作者单位	School of Environmental Sciences, Climatic Research Unit, University of East Anglia, Norwich, United Kingdom; Institute of Atmospheric Sciences and Climate (ISAC-CNR), Bologna, Italy; Istituto Nazionale di Geofisica e Vulcanologia, Bologna, Italy
推荐引用方式 GB/T 7714	Ratna S.B.,Cherchi A.,Osborn T.J.,et al. The Extreme Positive Indian Ocean Dipole of 2019 and Associated Indian Summer Monsoon Rainfall Response[J],2021,48(2).
APA	Ratna S.B.,Cherchi A.,Osborn T.J.,Joshi M.,&Uppara U..(2021).The Extreme Positive Indian Ocean Dipole of 2019 and Associated Indian Summer Monsoon Rainfall Response.Geophysical Research Letters,48(2).
MLA	Ratna S.B.,et al."The Extreme Positive Indian Ocean Dipole of 2019 and Associated Indian Summer Monsoon Rainfall Response".Geophysical Research Letters 48.2(2021).