Study on wavy distribution of rainfall associated with typhoon Matsa (2005)  

作　　者：LI Ying WANG JiZhi CHEN LianShou YANG YuanQin 

机构地区：[1]State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081, China [2]Center for Atmosphere Watch and Services, Chinese Academy of Meteorological Sciences, Beijing 100081, China

出　　处：《Chinese Science Bulletin》2007年第7期972-983,共12页

基　　金：Supported by the National Grand Fundamental Research 973 Program of China (Grant No. 2004CB418301);the National Natural Science Foundation of China (Grant Nos. 40675033, 40575018 and 40505009)

摘　　要：An analysis is made to investigate the structure features of the extensive heavy rainfall left by typhoon Matsa, after its landfall in China's Mainland in August 2005, based on a range of observational results, including surface intensive observation data, TBB data from China's FY-2 satellite, and NCEP 1°×1° reanalysis data. The study tries to explore the interaction between atmospheric waves, 3-D atmospheric structures, and typhoon rainbands. Observational facts, diagnostic analysis, and atmospheric wave theory are used to look into the formation mechanism of distant typhoon rainbands. Results show that (1) Matsa rainbands have the features of noticeable wave train distribution and long distance propaga-tion; (2) the typhoon rainbands extend as far as 2000 km northwardly from the typhoon center, with a wavelength of 500―1000 km and a wave period of 12―24 h; (3) the wave structure of Matsa rainbands is closely associated with the corresponding wave variation of the ambient 3-D atmospheric structures, including disturbance vorticity, divergence field, vertical motion field, water vapor flux divergence field, etc. (4) both observational facts and theoretical analysis show that the northward extending typhoon rainbands are associated with the mixed effects of atmospheric inertia wave and internal gravity wave; (5) only under proper atmospheric stratification and vertical wavenumber of gravity wave, can a ty-phoon stimulate such a wave being able to reach such a distance, and result in extending wavy rain-bands.An analysis is made to investigate the structure features of the extensive heavy rainfall left by typhoon Matsa, after its landfall in China's Mainland in August 2005, based on a range of observational results, including surface intensive observation data, TBB data from China＇s FY-2 satellite, and NCEP 1°×1° reanalysis data. The study tries to explore the interaction between atmospheric waves, 3-D atmospheric structures, and typhoon rainbands. Observational facts, diagnostic analysis, and atmospheric wave theory are used to look into the formation mechanism of distant typhoon rainbands. Results show that （1） Matsa rainbands have the features of noticeable wave train distribution and long distance propagation; （2） the typhoon rainbends extend as far as 2000 km northwardly from the typhoon center, with a wavelength of 500-1000 km and a wave period of 12-24 h; （3） the wave structure of Matsa rainbands is closely associated with the corresponding wave variation of the ambient 3-D atmospheric structures, including disturbance vorticity, divergence field, vertical motion field, water vapor flux divergence field, etc. （4） both observational facts and theoretical analysis show that the northward extending typhoon rainbands are associated with the mixed effects of atmospheric inertia wave and internal gravity wave; （5） only under proper atmospheric stratification and vertical wavenumber of gravity wave, can a typhoon stimulate such a wave being able to reach such a distance, and result in extending wavy rainbands.

关 键 词：2005年 麦莎台风 降水 波状起伏分布 

分 类 号：P444[天文地球—大气科学及气象学] P426.613