气候变化领域集成服务门户(CCPortal): Study of tropical tropospheric and lower stratospheric zonal wind variability in the context of dry and wet Indian summer monsoon years

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DOI	10.1007/s00382-019-04891-1
	Study of tropical tropospheric and lower stratospheric zonal wind variability in the context of dry and wet Indian summer monsoon years
	Mini V.K.; Hosalikar K.S.; Haridasan N.; Kausik K.
发表日期	2019
ISSN	0930-7575
起始页码	3691
结束页码	3701
卷号	53 期号:2020-05-06
英文摘要	This paper describes the comparative study on some features of the tropospheric and lower stratospheric circulation over the tropical Indian region during the monsoon season in the context of deficient and excess monsoon (dry and wet) years. The monthly mean of zonal wind component are computed directly with NCEP reanalysis data for the main rainy season of June–September. The composite anomalies of zonal wind circulation for monsoon season in four meteorologically important regions of lower atmosphere viz., lower troposphere, middle troposphere, upper troposphere and lower stratosphere in respect of wet and dry monsoon years were calculated and compared. The results of our analysis show major contrasts between the characteristics of winds of tropical troposphere and lower stratosphere over Indian region during the two scenarios. In the dry years, the troposphere and lower stratosphere are characterized by weaker wind flows in comparison with the normal flow of low level jet (LLJ) and tropical easterly jet (TEJ) streams. The observed weak LLJ and TEJ support the rainfall deficit in dry years. In contrast, during the wet years, the troposphere is dominated by stronger westerly flows at lower and middle tropospheric levels in concomitant with stronger easterlies in the upper troposphere and lower stratosphere. The long term variability of zonal winds averaged between 20°N and 20°S shows decreasing trend in the absolute values in speed during 1981 to 2010. Over the period of study, both tropical westerlies and easterlies and also jet streams have weakened. The results from this study serve as bases for further work on the tropospheric circulation features over the tropical Indian region for an enhanced understanding of the regional climate. © 2019, Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	Deficient monsoon year; Excess monsoon year; Lower stratosphere; Tropical troposphere; Zonal wind
语种	英语
scopus关键词	atmospheric circulation; comparative study; monsoon; stratosphere-troposphere interaction; summer; tropical environment; zonal wind; India
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/146009
作者单位	India Meteorological Department, Goa, India; India Meteorological Department, Mumbai, India
推荐引用方式 GB/T 7714	Mini V.K.,Hosalikar K.S.,Haridasan N.,et al. Study of tropical tropospheric and lower stratospheric zonal wind variability in the context of dry and wet Indian summer monsoon years[J],2019,53(2020-05-06).
APA	Mini V.K.,Hosalikar K.S.,Haridasan N.,&Kausik K..(2019).Study of tropical tropospheric and lower stratospheric zonal wind variability in the context of dry and wet Indian summer monsoon years.Climate Dynamics,53(2020-05-06).
MLA	Mini V.K.,et al."Study of tropical tropospheric and lower stratospheric zonal wind variability in the context of dry and wet Indian summer monsoon years".Climate Dynamics 53.2020-05-06(2019).