气候变化领域集成服务门户(CCPortal): Tropical cyclogenesis identification using eddy detection technique for the Bay of Bengal Basin

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DOI	10.1016/j.atmosres.2021.105670
	Tropical cyclogenesis identification using eddy detection technique for the Bay of Bengal Basin
	Albert J.; Sahoo B.; Bhaskaran P.K.
发表日期	2021
ISSN	0169-8095
卷号	260
英文摘要	The study deals with formative stages and lead detection time of tropical cyclogenesis using Okubo-Weiss Parameter, a proven robust eddy detection technique used for tropical cyclones that developed over the north Indian Ocean basin. Specifically, it aims to identify the initial traces of upper atmospheric genesis and understand the spatio-temporal evolution of pre-cyclonic eddy vortices in the atmospheric column using high-resolution WRF model outputs simulated for different cyclones. A coarser resolution grid of 27 km was used for identification purpose and a finer resolution of 9 km used to evaluate the characteristics of eddy vortices. Case studies were performed with four post-monsoon severe cyclones viz.; Phailin(2013), Vardah(2013), Gaja(2018), Madi(2013) and two pre-monsoon cyclones Mora(2017) and Aila(2009) that developed over this region. Study reveals a good skill in genesis prediction with a minimum of four days (~ 90 h) lead time in all cases irrespective of pre- and post-monsoon seasons. Factors that favor cyclogenesis during pre-monsoon season (except relative humidity) contribute to early detection of pre-cyclonic vortices in the atmosphere. Initiation mechanism of tropical cyclogenesis occurs at upper atmospheric levels and also detected at higher lead time for pre-monsoon cases unlike the post-monsoon cases. A lower relative vorticity at 850 hPa in pre-monsoon seasons is a major factor that initiates pre-cyclonic vortices at relatively higher levels compared to post-monsoon cyclones. Study also investigated the behavior of eddies in the atmospheric column for a non-developing case and compared these findings against developing cases. The study signifies that this technique is quite promising and has potential for early detection of tropical cyclogenesis in the atmospheric column prior to satellite detection over ocean surface. © 2021 Elsevier B.V.
英文关键词	Bay of Bengal; Okubo-Weiss Parameter; Severe cyclones; Tropical cyclogenesis; WRF model
来源期刊	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/236679
作者单位	Department of Ocean Engineering, Naval Architecture Indian Institute of Technology Kharagpur, Kharagpur, 721 302, India; CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, China
推荐引用方式 GB/T 7714	Albert J.,Sahoo B.,Bhaskaran P.K.. Tropical cyclogenesis identification using eddy detection technique for the Bay of Bengal Basin[J],2021,260.
APA	Albert J.,Sahoo B.,&Bhaskaran P.K..(2021).Tropical cyclogenesis identification using eddy detection technique for the Bay of Bengal Basin.Atmospheric Research,260.
MLA	Albert J.,et al."Tropical cyclogenesis identification using eddy detection technique for the Bay of Bengal Basin".Atmospheric Research 260(2021).