台风生成机制研究进展.pptVIP

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台风生成机制研究进展

Department of Atmospheric Science, PKU 台风生成机制研究进展 the Coriolis parameter ( f ) is not necessary for Vaimei The first study about wind surge is in China 1978 在对太平洋和南海上热带气旋的早期统计中发现部分热带气旋生成前有低空急流 并不是所有的热带气旋在生成前都有低空急流出现 张婉佩, 西北太平洋,南海热带扰动发展与不发展的对比分析. 台风会议文集. 上海, 上海科学技术出版社, 1978, pp 240. Dynamic illustration to vortex merge Guinn, T. A., and W. H. Schubert, 1993: Hurricane spiral bands. J. Atmos. Sci., 50, 3380-3403 Good News ?? 在 对100个西北太平洋热带气旋的生成过程云图统计研究中发现, 无论哪一类初始扰动低压, 在变为热带气旋前都有一个或几个长达500-1000 km宽达200-300 km的长云带被卷入初始涡旋 (包澄澜等, 2000). How about undeveloped cases? Pre-Floyd 1999 vs. TD 02 failed to hurricane Pre-Floyd 1999 vs. TD 02 failed to hurricane Pre-Floyd 1999 vs. TD 02 failed to hurricane After Ritchie (2003) “The development of convective bursts was one major difference between TD 2 and Hurricane Floyd” Is this true for other cases? How does convective burst occur? conclusion From all available large scale and mesoscale index for hurricane genesis, not all of them are needed for a particular cyclone case. Question Difference between developed and undeveloped group SST Vertical wind shear low-level relative vorticity (ζr ) relative humidity in the mid-troposphere ( RH ) We are working on ……. Conclusion For tropical cyclongenesis Moisture is the “gas” Mesoscale process is the “starter” Further Research More observation are needed From 1978 to 2007 and ………. Mean divergence for 25 tropical disturbances QuikScat Non-developed cases: RH in the day when tropical disturbances dissipated; Developed cases: RH in the day when tropical depressions develop. For the developed cases, the RH 60% RH = 60% NCEP Non-developed cases: 3-day mean Cloud liquid water before tropical disturbances dissipated; Developed cases: 3-day mean Cloud liquid water before tropical depression. SST 26.5 ℃ Moving inland 0.16 TRMM √ Cross-equatorial Flow Orographic Influence Wind Surge Vortex Merger Interactio

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