Global S&T Development Trend Analysis Platform of Resources and Environment
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.1; Hosalikar, K. S.2; Haridasan, N.1; Kausik, Kunal1 | |
2019-09-01 | |
发表期刊 | CLIMATE DYNAMICS
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ISSN | 0930-7575 |
EISSN | 1432-0894 |
出版年 | 2019 |
卷号 | 53页码:3691-3701 |
文章类型 | Article |
语种 | 英语 |
国家 | India |
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 degrees N and 20 degrees 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. |
英文关键词 | Zonal wind Tropical troposphere Lower stratosphere Excess monsoon year Deficient monsoon year |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000483626900070 |
WOS关键词 | JET-STREAM |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/186398 |
专题 | 气候变化 |
作者单位 | 1.Indian Meteorol Dept, Panaji, Goa, India; 2.Indian Meteorol Dept, Mumbai, Maharashtra, 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]. CLIMATE DYNAMICS,2019,53:3691-3701. |
APA | Mini, V. K.,Hosalikar, K. S.,Haridasan, N.,&Kausik, Kunal.(2019).Study of tropical tropospheric and lower stratospheric zonal wind variability in the context of dry and wet Indian summer monsoon years.CLIMATE DYNAMICS,53,3691-3701. |
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(2019):3691-3701. |
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