气候变化领域集成服务门户(CCPortal): Impact of the Indo-Western Pacific Ocean Capacitor mode on South Asian summer monsoon rainfall

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DOI	10.1007/s00382-019-04850-w
	Impact of the Indo-Western Pacific Ocean Capacitor mode on South Asian summer monsoon rainfall
	Chowdary J.S.; Patekar D.; Srinivas G.; Gnanaseelan C.; Parekh A.
发表日期	2019
ISSN	0930-7575
起始页码	2327
结束页码	2338
卷号	53 期号:2020-03-04
英文摘要	The influence of Indo-Western Pacific Ocean Capacitor (IPOC) mode on South Asian summer monsoon rainfall variability is investigated in the present study. It is found from the observations that the IPOC mode induces a tripole pattern in precipitation anomalies over the South Asian region. Strong positive precipitation anomalies over some parts of western Ghats and Sundarbans and Bangladesh region separated by negative precipitation anomalies over the monsoon trough region are found to be the main characteristic features closely associated with the IPOC mode. It is noted that anomalous western north Pacific (WNP) anticyclone and tropical Indian Ocean (TIO) warming maintain a tripole precipitation pattern over the South Asian region. Anomalous low level convergence in the northern flank of WNP anticyclone and orographic lift cause enhanced rainfall over the Sundarbans and Bangladesh region. Meanwhile, westward propagating atmospheric cold Rossby wave as a response to suppressed convection over the WNP region induced moisture divergence and downward motion play important role in maintaining negative rainfall anomalies over the monsoon trough. At the same time, TIO SST warming supported by easterly wind anomalies associated with WNP anticyclone has contributed to the enhanced rainfall over parts of eastern Arabian Sea and western Ghats. Coupled General Circulation Model sensitivity experiments are performed to investigate individual and combined impact of the TIO warming and WNP circulation on south Asian summer monsoon rainfall variability associated with IPOC mode. The model experiments revealed that WNP anticyclone influences the rainfall over the monsoon trough region and Sundarbans-Bangladesh region. Further the moisture convergence induced by local SST warming is mainly helping to sustain enhanced Western Ghats rainfall. Sub-seasonal variability of ISM rainfall associated with the IPOC modes is also discussed. This study advocates the importance of IPOC mode in exerting strong impact on regional summer rainfall variability over the Indian/South Asian summer monsoon region on the interannual time scale. Thus, it is important to consider the possible roles of TIO warming and WNP circulation in predicting the South Asian summer monsoon rainfall. © 2019, Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	IPOC mode; Precipitation; South Asian summer monsoon; Tropical Indian Ocean; Western North Pacific high
语种	英语
scopus关键词	anticyclone; intertropical convergence zone; monsoon; precipitation assessment; rainfall; regional climate; summer; Indian Ocean; Indian Ocean (Tropical); Pacific Ocean; Pacific Ocean (North); Pacific Ocean (West); South Asia
来源期刊	Climate Dynamics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/146097
作者单位	Indian Institute of Tropical Meteorology, Pune, 411008, India; Savitribai Phule Pune University, Pune, 411007, India; Indian National Centre for Ocean Information Services, Hyderabad, 500090, India
推荐引用方式 GB/T 7714	Chowdary J.S.,Patekar D.,Srinivas G.,et al. Impact of the Indo-Western Pacific Ocean Capacitor mode on South Asian summer monsoon rainfall[J],2019,53(2020-03-04).
APA	Chowdary J.S.,Patekar D.,Srinivas G.,Gnanaseelan C.,&Parekh A..(2019).Impact of the Indo-Western Pacific Ocean Capacitor mode on South Asian summer monsoon rainfall.Climate Dynamics,53(2020-03-04).
MLA	Chowdary J.S.,et al."Impact of the Indo-Western Pacific Ocean Capacitor mode on South Asian summer monsoon rainfall".Climate Dynamics 53.2020-03-04(2019).