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学科主题: Meteorology & Atmospheric Sciences
题名: Modulation of Low-Latitude West Wind on Abnormal Track and Intensity of Tropical Cyclone Nargis (2008) in the Bay of Bengal
作者: Li, WW ; Wang, CZ ; Wang, DX ; Yang, L ; Deng, Y
通讯作者: dxwang@scsio.ac.cn
关键词: TC Nargis (2008) ; tropical cyclone ; westerly wind ; cross-equatorial flow ; Bay of Bengal
刊名: ADVANCES IN ATMOSPHERIC SCIENCES
发表日期: 2012
卷: 29, 期:2, 页:407-421
部门归属: [Li Wei-Wei; Wang Dongxiao; Yang Lei; Deng Yi] Chinese Acad Sci, State Key Lab Trop Oceanog, S China Sea Inst Oceanol, Guangzhou 510301, Guangdong, Peoples R China; [Wang Chunzai] NOAA, Atlantic Oceanog & Meteorol Lab, Miami, FL 33149 USA
项目归属: LTO
摘要: Tropical cyclone (TC) Nargis (2008) made landfall in Myanmar on 02 May 2008, bringing a storm surge, major flooding, and resulting in a significant death toll. TC Nargis (2008) displayed abnormal features, including rare eastward motion in its late stage, rapid intensification before landing. Using reanalysis data and a numerical model, we investigated how a low-latitude westerly wind modulated TC Nargis' (2008) track and provided favorable atmospheric conditions for its rapid intensification. More importantly, we found a possible counterbalance effect of flows from the two hemispheres on the TC track in the Bay of Bengal. Our analysis indicates that a strong westerly wind burst across the Bay of Bengal, resulting in TC Nargis' (2008) eastward movement after its recurvature. This sudden enhancement of westerly wind was mainly due to the rapidly intensified mid-level cross-equatorial flow. Our results show that a high-pressure system in the Southern Hemisphere induced this strong, mid-level, cross-equatorial flow. During the rapid intensification period of TC Nargis (2008), this strong and broad westerly wind also transported a large amount of water vapor to TC Nargis (2008). Sufficient water vapor gave rise to continuously high and increased mid-level relative humidity, which was favorable to TC Nargis' (2008) intensification. Condensation of water vapor increased the energy supply, which eventuated the intensification of TC Nargis (2008) to a category 4 on the Saffir-Simpson scale.
语种: 英语
WOS记录号: WOS:000300530700017
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/10205
Appears in Collections:热带海洋环境国家重点实验室(LTO)_期刊论文

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Li, WW; Wang, CZ; Wang, DX; Yang, L; Deng, Y.Modulation of Low-Latitude West Wind on Abnormal Track and Intensity of Tropical Cyclone Nargis (2008) in the Bay of Bengal,ADVANCES IN ATMOSPHERIC SCIENCES,2012,29(2):407-421
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