气候变化领域集成服务门户(CCPortal): Meridional oscillation in genesis location of tropical cyclones in the postmonsoon Bay of Bengal

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DOI	10.1007/s00382-019-04794-1
	Meridional oscillation in genesis location of tropical cyclones in the postmonsoon Bay of Bengal
	Fan K.; Wang X.; Foltz G.R.; Balaguru K.
发表日期	2019
ISSN	0930-7575
起始页码	2103
结束页码	2118
卷号	53 期号:2020-03-04
英文摘要	It is found that the average genesis location of tropical cyclones (TCs) in the postmonsoon (October–December) Bay of Bengal (BoB) shows a notable meridional oscillation during 1980–2015. During years when the average genesis location shifts northward (north-years), the average maximum sustained wind speed, the average landfall wind speed and the number of category 4–5 TCs are all larger than those during years when the average genesis location displaces southward (south-years). Genesis potential index analysis shows that changes in relative humidity and vertical wind shear are mainly responsible for the meridional oscillation of the average genesis location of TCs. The changes in relative humidity and wind shear are closely related to changes in atmospheric circulation. Composite analysis reveals that sea surface temperature (SST) anomalies over the equatorial Pacific Ocean show a La Niña-like pattern (El Niño-like pattern) during north-years (south-years) of TC genesis locations. The SST anomalies over the equatorial Pacific Ocean induce a strengthened (weakened) Walker circulation during north-years (south-years) of TC genesis locations, influencing the atmospheric circulation over the tropical Indian Ocean. In addition, a stationary Rossby wave train from the North Pacific to the Iranian Plateau (east of Iranian Plateau) during north-years (south-years) induces changes in atmospheric circulation over the extratropical North Indian Ocean. Together, the tropical and extratropical influences contribute to the north–south patterns of relative humidity and vertical wind shear anomalies in the postmonsoon BoB, which drive the meridional oscillation of TC genesis locations. This study has significant implications for the prediction of TCs and disaster prevention and mitigation over the BoB. © 2019, Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	Bay of Bengal; El Niño-Southern Oscillation; Pacific Decadal Oscillation; Tropical cyclone
语种	英语
scopus关键词	El Nino; meridional circulation; monsoon; Pacific Decadal Oscillation; relative humidity; sea surface temperature; tropical cyclone; wind shear; wind velocity; Bay of Bengal; Indian Ocean; Pacific Ocean; Pacific Ocean (Equatorial); Pacific Ocean (North)
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/146112
作者单位	College of Oceanography, Hohai University, Nanjing, 210098, China; Laboratory for Regional Oceanography and Numerical Modeling, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266237, China; Atlantic Oceanographic and Meteorological Laboratory, Miami, FL, United States; Marine Sciences Laboratory, Pacific Northwest National Laboratory, Seattle, WA, United States
推荐引用方式 GB/T 7714	Fan K.,Wang X.,Foltz G.R.,et al. Meridional oscillation in genesis location of tropical cyclones in the postmonsoon Bay of Bengal[J],2019,53(2020-03-04).
APA	Fan K.,Wang X.,Foltz G.R.,&Balaguru K..(2019).Meridional oscillation in genesis location of tropical cyclones in the postmonsoon Bay of Bengal.Climate Dynamics,53(2020-03-04).
MLA	Fan K.,et al."Meridional oscillation in genesis location of tropical cyclones in the postmonsoon Bay of Bengal".Climate Dynamics 53.2020-03-04(2019).