西北太平洋上大尺度環境與颱風特性的關係

黃筱晴

doi:10.6342/NTU.2010.01084

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西北太平洋上大尺度環境與颱風特性的關係

Association of typhoon characteristics with large-scale environment over the western North Pacific

黃筱晴 , Masters　　Advisor：周佳;林依依　　

繁體中文 DOI： 10.6342/NTU.2010.01084

颱風移動速度；颱風強度；颱風移動方向；年際變化；西北太平洋； yphoon translation speed ； typhoon intensity ； typhoon translation direction ； interannual variation ； the Western North Pacific

Abstract │ Reference (90) │ Times Cited (1) │ Altmetrics

Abstract 〈TOP〉

Parallel Abstract 〈TOP〉

Typhoon is an important severe weather phenomenon over the Western North Pacific. Through large-scale environmental field of climatic and sea oceanic factors, mechanical and thermal mechanism would have impact on typhoon characteristics. As global warming becomes seriously, large-scale environmental field may also change. This research would discuss about the large-scale environmental field effects for typhoon characteristics during long-term climatology. Also the interannual variations of the large-scale environmental field, especially for typhoon translation speed, would be discussed. And then we also want to get more information to know how the typhoon will change under global warming.
According to long-term climatology analysis, typhoon has the slowest translation speed on the monsoon trough, South of 30°N. In the aspect of interannual variance, the typhoon translation speed would be faster on the monsoon trough and would be slower on the subtropical ridge during strong cold years. Process would be opposite during strong warm years. Either long-term climatology or interannual variations, typhoon translation speed may associate with mid-level (500hPa) geopotential height gradient of North of 30°N, and associates with low-level (925hPa) geopotential height gradient of South of 30°N, which means typhoons move faster (slow) when the large (small) gradient.
According to long-term climatology analysis, typhoon intensity is strongest among the Pacific subtropical ridge and monsoon trough. In the aspect of interannual variance, the typhoon intensity will weaken with monsoon trough move western during strong cold years, and enhance among the Pacific subtropical ridge and monsoon trough during strong warm years. Either long-term climatology or interannual variations, the main effect of typhoon intensity is vertical wind shear, and also have a relationship between sea temperatures, especially reverse on interannual. So we also know that not only sea temperatures will affect typhoon intensity, but also typhoon intensity will affect the sea temperatures. In addition, strong typhoon intensity will decrease mid-level and low-level geopotential height and increase high-level geopotential height.
According to long-term climatology typhoon translation direction is northwestward of South of  30°N, northward around 30°N and northeastward of North of  30°N. In the aspect of interannual variance, typhoon translation direction will be more northward when the subtropical ridge weakens during strong cold years and will be more westward when the subtropical ridge enhances during strong warm years.

Reference ( 90 ) 〈TOP〉

Adem, J., 1956: A series solution for the barotropic vorticity equation and its application in the study of atmospheric vortices. Tellus, 8, 364-372.
連結：
Anthes, R. A., 1982: Tropical cyclones: Their evolution, structure and effects. Amer. Meteor. Soc., 208 pp.
連結：
Bengtsson, L., M. Botzet, and M. Esch, 1996: Will greenhouse gas induced warming over the next 50 years lead to higher frequency and greater intensity of hurricanes? Tellus, 48A, 57-73.
連結：
Black, M. L., Gamache, J. F., Marks Jr., F. D., Samsury, C. E., and Willoughby H. E., 2002: Eastern Pacific hurricanes Jimena of 1991 and Olivia of 1994: The effects of vertical shear on structure and intensity. Mon. Wea. Rev., 130, 2291-2312.
連結：
Briegel, L. M. and W. M. Frank, 1997: Large-scale influences on tropical cyclogenesis in the western North Pacific. Mon. Wea. Rev., 125, 1397-1413.
連結：

Times Cited (1) 〈TOP〉

許牧豪(2011)。雙眼牆颱風與西南季風探討。臺灣大學大氣科學研究所學位論文。2011。1-105。

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