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Title
Japanese: 
English:Characteristics of Long-lived Typhoons over the Indochinese Peninsula 
Author
Japanese: 織茂 奈津美, 渡邉 恵, 鼎 信次郎.  
English: Natsumi Orimo, Megumi Watanabe, Shinjiro Kanae.  
Language English 
Journal/Book name
Japanese: 
English: 
Volume, Number, Page        
Published date Dec. 13, 2018 
Publisher
Japanese: 
English: 
Conference name
Japanese: 
English:American Geophysical Union 2018 Fall meeting 
Conference site
Japanese: 
English:Washington,D.C. 
Official URL https://agu.confex.com/agu/fm18/meetingapp.cgi/Paper/431264
 
Abstract Several typhoons landing on the Indochinese Peninsula show much smaller dissipation rates of vorticity than average and cause extensive disasters across coast areas as well as inland areas. Such typhoons are called “long-lived typhoons,” and it is necessary to clarify the mechanism of the small rate of dissipation. In this research, we aim to expand knowledge of the mechanism of “long-lived typhoons,” and the following two analyses were conducted. We analyzed typhoons landing on the Indochinese Peninsula during the period 1958 - 2016. The first analysis focused on changes in the proportion of long-lived typhoons by the month and decade in addition to the landing position. The second analysis focused on extracting the physical variables and their environmental fields related to typhoon lifetime. The Self-Organizing Map (SOM) was used for the extraction based on environmental fields such as the precipitable water, wind velocity at 850hPa, and the sea level barometric pressure. The first analysis showed that depending on the landing position, typhoon lifetime seemed to differ a lot and also seemed to lengthen as time went on, especially in the south of the peninsula. The second analysis showed that in the whole peninsula or the south part, the positive deviation field of the precipitable water might cause long-lived typhoons. This result supports the findings in past literature on the relationship between the precipitable water and long-lived typhoons.

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