Anomalous western North Pacific monsoon trough and tropical cyclone activities

GAO Jian-yun; ZHANG Xiu-zhi; JIANG Zhi-hong; YOU Li-jun

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GAO Jian-yun, ZHANG Xiu-zhi, JIANG Zhi-hong, YOU Li-jun. Anomalous western North Pacific monsoon trough and tropical cyclone activities[J]. Haiyang Xuebao, 2008, 30(3): 35-47.

Citation:

GAO Jian-yun, ZHANG Xiu-zhi, JIANG Zhi-hong, YOU Li-jun. Anomalous western North Pacific monsoon trough and tropical cyclone activities[J]. Haiyang Xuebao, 2008, 30(3): 35-47.

GAO Jian-yun, ZHANG Xiu-zhi, JIANG Zhi-hong, YOU Li-jun. Anomalous western North Pacific monsoon trough and tropical cyclone activities[J]. Haiyang Xuebao, 2008, 30(3): 35-47.

Citation:

GAO Jian-yun, ZHANG Xiu-zhi, JIANG Zhi-hong, YOU Li-jun. Anomalous western North Pacific monsoon trough and tropical cyclone activities[J]. Haiyang Xuebao, 2008, 30(3): 35-47.

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Anomalous western North Pacific monsoon trough and tropical cyclone activities

1.
Fujian Climate Center, Fuzhou 350001, China
2.
National Climate Center, Beijing 100081, China
3.
Nanjing University of Information Science and Technology, Nanjing 210044, China

Received Date: 2007-12-10
Rev Recd Date: 2008-04-02

Abstract

Abstract

A general survey was made of 1979-2005 tropical cyclones(TC) before a sequence is established of the western North Pacific monsoon trough(MT) tropical cyclones(MTTC).Statistics show that in May October,1979-2005,TCs originating from the South China Sea(SCS) and western North Pacific (WNP) totaled 672,of which 491 had the origin in the monso on trough(i.e.,MTTCs),making up 73.1% of the total and 79.2% of the TCs landing on China in this period.It follows that grasp of their activity features means the grasp of the main activity laws of WNP and China-landing TCs.Based on the analysis of day-to-day circulation fields the MTs are categorized as(1) SCS type,(2) SCS-WNP type,(3) rever saltype,(4) triple-flow type and(5) WNP type.Interms of the strength and position of May to October monsoon troughs,subtropical highs and cross-equat orial flows on anannual basis,the 1979-2005 monsoon troughs are separated into such annual types as the southwest-northwest,and eastward of mean as well as normal.For the first three MT anomalous annual types diagnostic study is conducted of TC for mation favor able SST and large-scale circulation fields,vaport ransport,at mospheric apparent heat sources,apparent vapor sinks,and zonal wind vertical shear,indicating that for the different MT annual types differences in Pacific SST fields cause the disparity in the intensity of the Hadley and Walker circulations,t he positions of western Pacific subtropical high and South Asian high as well as the intensity of cross-equatorial flows,thus producing TC genesis favorable thermal,dynamic and environmental conditions,leading to remarkable differences in MTTC genesis area,frequency,track and TC China-landing location.
- western North Pacific,
- monsoon trough,
- tropicalcy clone

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References(20)

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