气候变化领域集成服务门户(CCPortal): Statistical evidence on distinct impacts of short- and long-time fluctuations of Indian Ocean surface wind fields on Indian summer monsoon rainfall during 1991

CCPortal

DOI	10.1007/s00382-020-05156-y
	Statistical evidence on distinct impacts of short- and long-time fluctuations of Indian Ocean surface wind fields on Indian summer monsoon rainfall during 1991–2014
	Zheng Y.; Bourassa M.A.; Ali M.M.
发表日期	2020
ISSN	0930-7575
起始页码	3053
结束页码	3076
卷号	54
英文摘要	This observational study mainly examines the impacts of short- and long-time fluctuations of surface wind fields over the Arabian Sea (AS), the Bay of Bengal (BoB), and the southern Indian Ocean (SIO) on Indian Summer Monsoon Rainfall (ISMR), with special reference to strong and weak Indian summer monsoons (ISM). Two datasets over 1991–2014 are used: (1) the daily gridded rainfall produced by India Meteorological Department (IMD), and (2) the Cross-Calibrated Multi-Platform (CCMP) wind product version 2.0 created by Remote Sensing Systems. Monthly mean surface wind speed, convergence, and curl in the AS, BoB, and SIO are overall not significantly different between strong and weak ISMRs except for wind speed in the AS in September. However, the probability density function (PDF) distribution of daily values over the AS, BoB, and SIO during strong ISMRs is different from during weak ISMs, suggesting that sub-monthly surface wind characteristics could be useful in diagnosing rainfall characteristics. Except for rainfall in the northeast part of India, Indian regional rainfalls are closely linked with surface wind speeds over the AS, and wind convergence and curl over the BoB on short timescales of up to 1 week. The daily area-averaged wind convergence over the BoB is better correlated with regional rainfall during strong ISMs than during weak ISMRs. Multiple linear regression analysis shows that the fluctuations of monthly wind fields in the AS and BoB can affect monthly rainfall in some regions but are not related to a significant change in rainfall over the whole India. It is the short-time fluctuations of wind speed over the AS as well as wind convergence and curl over the BoB rather than their long (monthly) timescale fluctuations that are related to the strength of ISMR. Surface winds over the SIO on weather timescales have little influence on ISMR. © 2020, Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	CCMP surface winds; Indian regional rainfall; Indian summer monsoon rainfall
语种	英语
scopus关键词	climate effect; convergence; monsoon; probability density function; rainfall; regional climate; regression analysis; remote sensing; surface wind; wind field; wind velocity; Arabian Sea; Bay of Bengal; Indian Ocean; Indian Ocean (South)
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/145557
作者单位	Center for Ocean-Atmospheric Prediction Studies (COAPS), Florida State University, 2000 Levy Avenue, Room 296, Building A, Tallahassee, FL 32306, United States; Department of Earth, Ocean, Atmospheric Science, Florida State University, Tallahassee, FL, United States; Andhra Pradesh State Disaster Management Authority, Kunchanapalli, India
推荐引用方式 GB/T 7714	Zheng Y.,Bourassa M.A.,Ali M.M.. Statistical evidence on distinct impacts of short- and long-time fluctuations of Indian Ocean surface wind fields on Indian summer monsoon rainfall during 1991–2014[J],2020,54.
APA	Zheng Y.,Bourassa M.A.,&Ali M.M..(2020).Statistical evidence on distinct impacts of short- and long-time fluctuations of Indian Ocean surface wind fields on Indian summer monsoon rainfall during 1991–2014.Climate Dynamics,54.
MLA	Zheng Y.,et al."Statistical evidence on distinct impacts of short- and long-time fluctuations of Indian Ocean surface wind fields on Indian summer monsoon rainfall during 1991–2014".Climate Dynamics 54(2020).