气候变化领域集成服务门户(CCPortal): Effects of vertical wind shear and storm motion on tropical cyclone rainfall asymmetries over the North Indian Ocean

CCPortal

DOI	10.1016/j.dynatmoce.2020.101196
	Effects of vertical wind shear and storm motion on tropical cyclone rainfall asymmetries over the North Indian Ocean
	Uddin M.J.; Nasrin Z.M.; Li Y.
发表日期	2021
ISSN	03770265
卷号	93
英文摘要	Tropical cyclone (TC) rainfall asymmetry is often influenced by vertical wind shear and storm motion. This study examined the effects of environmental vertical wind shear (200-850 hPa) and storm motion on TC rainfall asymmetry over the North Indian Ocean (NIO): the Bay of Bengal (BoB) and the Arabian Sea (AS). Four TC groups were used in this study: Cyclonic Storm (CS), Severe Cyclonic Storm (SCS), Very Severe Cyclonic Storm (VSCS) and Extreme Severe Cyclonic Storm (ESCS). The Fourier coefficients for wave number-1 was used to analyze the structure of TC rainfall asymmetry. Results show that the maximum TC rainfall asymmetry was predominantly in the downshear left quadrant in the BoB, while it placed to downshear right quadrant in the AS, likely due to the different primary circulation strength of the TC vortex. For the most intense cyclone (ESCS), the maximum TC rainfall asymmetry was in the upshear left quadrant in the BoB, whereas it was downshear right quadrant in the AS. It is evident for both basins that the magnitude of TC rainfall asymmetry declined (increased) with TC intensity (shear strength). This study also examined the collective effects of vertical wind shear and storm motion on TC rainfall asymmetry. Here, the analysis in case of the strong shear environment (>7 m s-1) omitted for the AS because the maximum value for this basin was about 7 m s-1. The result showed that the downshear left quadrant was dominant in the BoB for the maximum TC rainfall asymmetry. In a weak shear environment (<5 m s-1), on the other hand, downshear right quadrant is evident for the maximum TC rainfall asymmetry in the BoB, while it placed dominantly downshear left quadrant in the AS. In the case of motion-relative wavenumber-1, the maximum TC rainfall asymmetry was dominantly downshear for both basins. © 2020 Elsevier B.V.
英文关键词	Arabian Sea; Bay of Bengal; North Indian Ocean; TRMM; Tropical Cyclone; VWS
语种	英语
scopus关键词	Fourier analysis; Hurricanes; Rain; Storms; Tropics; Collective effects; Fourier coefficients; Intense cyclones; North indian oceans; Rainfall asymmetry; Shear environments; Tropical cyclone; Vertical wind shear; Shear flow; asymmetry; rainfall; storm; TRMM; tropical cyclone event; wind shear; Arabian Sea; Bay of Bengal; Indian Ocean; Indian Ocean (North)
来源期刊	Dynamics of Atmospheres and Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/178266
作者单位	Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, School of Atmospheric Physics, Nanjing University of Information Science & Technology, Nanjing, 210044, China; Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, 519082, China; Research Society, Nanjing, 210044, China
推荐引用方式 GB/T 7714	Uddin M.J.,Nasrin Z.M.,Li Y.. Effects of vertical wind shear and storm motion on tropical cyclone rainfall asymmetries over the North Indian Ocean[J],2021,93.
APA	Uddin M.J.,Nasrin Z.M.,&Li Y..(2021).Effects of vertical wind shear and storm motion on tropical cyclone rainfall asymmetries over the North Indian Ocean.Dynamics of Atmospheres and Oceans,93.
MLA	Uddin M.J.,et al."Effects of vertical wind shear and storm motion on tropical cyclone rainfall asymmetries over the North Indian Ocean".Dynamics of Atmospheres and Oceans 93(2021).