Statistical and Comparative Analysis of Tropical Cyclone Activity over the Arabian Sea and Bay of Bengal (1977–2018)

IF 1.5 4区 地球科学 Q4 METEOROLOGY & ATMOSPHERIC SCIENCES 热带气象学报 Pub Date : 2020-01-01 DOI:10.46267/j.1006-8775.2020.038
Xiao-ting Fan, L. Ying, Lyu Ai-min, Long-sheng Liu
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引用次数: 10

Abstract

A statistical comparative analysis of tropical cyclone activity over the Arabian Sea (AS) and Bay of Bengal (BoB) has been conducted using best-track data and wind radii information from 1977 to 2018 issued by the Joint Typhoon Warning Center. Results show that the annual variation in the frequency and duration of tropical cyclones has significantly increased over time over the AS and insignificantly decreased over the BoB. The monthly frequency of tropical cyclones over the AS and the BoB shows a notable bimodal character, with peaks occurring in May and OctoberNovember, respectively. The maximum frequency of tropical cyclones occurs in the second peak as a result of the higher moisture content at mid-levels in the autumn. However, the largest proportion of strong cyclones (H1-H5 grades) occurs in the first peak as a result of the higher sea surface temperatures in early summer. Tropical cyclones over the AS break out later during the first peak and activity ends earlier during the second peak, in contrast with those over the BoB. This is related to the onset and drawback times of the southwest monsoon in the two basins. Tropical cyclones over the AS are mainly generated in the eastern basin, whereas in the BoB the genesis locations are meridionally (zonally) distributed in May-June (October-November) as a result of the seasonal movement of the low-level positive vorticity belt. The Arabian Sea is dominated by tropical cyclones that track west and northwest, accounting for about 74.6% of all the tropical cyclones there, whereas the tropical cyclones with a NE track account for only 25.4%. The proportions of the three types of tracks are similar in the BoB, with each accounting for about 33% of the tropical cyclones. The mean intensity and size of tropical cyclones over the AS are stronger and larger, respectively, than those over the BoB and the size of tropical cyclones over the North Indian Ocean in early summer is larger than that in the autumn. The asymmetrical structure of tropical cyclones over the North Indian Ocean is affected by topography and the longest radius of the 34 kt surface wind often lies in the eastern quadrant of the tropical cyclone circulation in both sea areas.
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1977-2018年阿拉伯海和孟加拉湾热带气旋活动的统计与比较分析
利用联合台风预警中心1977 - 2018年发布的最佳路径数据和风半径资料,对阿拉伯海(AS)和孟加拉湾(BoB)的热带气旋活动进行了统计比较分析。结果表明:热带气旋发生频率和持续时间的年际变化在东半球呈显著上升趋势,在东半球呈不显著下降趋势。热带气旋的月频率表现出明显的双峰特征,高峰分别出现在5月和10月。热带气旋的最大频率出现在第二个高峰,因为秋季中层的水分含量较高。然而,由于初夏海面温度较高,强气旋(H1-H5级)出现在第一个高峰的比例最大。热带气旋在第一次高峰时爆发较晚,在第二次高峰时活动结束较早。这与两个盆地西南季风的起止时间有关。南亚热带气旋主要产生于东部盆地,而在西南偏南,由于低层正涡度带的季节性运动,热带气旋的发生地点在经向(纬向)上分布于5 - 6月(10 - 11月)。阿拉伯海以西向和西北向的热带气旋为主,约占所有热带气旋的74.6%,而东北向的热带气旋仅占25.4%。三种路径在BoB中所占比例相近,各占热带气旋总数的33%左右。热带气旋的平均强度和大小在初夏比秋季要大,而热带气旋的平均强度和大小在初夏比秋季要大。北印度洋热带气旋的不对称结构受地形的影响,34 kt地面风的最长半径往往位于两个海区热带气旋环流的东部象限。
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来源期刊
热带气象学报
热带气象学报 METEOROLOGY & ATMOSPHERIC SCIENCES-
CiteScore
1.80
自引率
8.30%
发文量
2793
审稿时长
6-12 weeks
期刊介绍: Information not localized
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