| ANALYSES OF WIND STRUCTURE OF TYPHOON FUNG-WONG (2008) AND ITS RELATION TO PRECIPITATION REGION |
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| 作者姓名： | 周玉淑 刘黎平 |
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| 作者单位： | [1]Laboratory of Cloud-Precipitation Physics and Severe Storms （LACS）, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China [2]State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081, China |
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| 基金项目： | State Key Development Program for Basic Research of China，Project of the Ministry of Sciences and Technology of the People's Republic of China，Projects of the Natural Science Foundation of China，Open Project of State Key Laboratory of Severe Weather |
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| 摘 要： | Using real analysis data of 1°×1° resolution of the National Center for Environmental
Prediction/National Center for Atmospheric Research (NCEP/NCAR), the nondivergent wind component
and irrotational wind component obtained by the harmonic-cosine(H-C) method, and the wind structure of
Typhoon Fung-Wong (coded 0808 in China) in 2008 was analyzed. The results indicated that the
irrotational component was advantageous over the total wind in reflecting both the changes in convergent
height and the asymmetrical convergence of Fung-Wong. In Fung-Wong, the nondivergent component was
larger than the irrotational component, but the latter was much more variable than the former, which was
obtained only from the wind partition method. Further analyses on the irrotational component
demonstrated that the location of the convergent center at lower levels was almost the same as the
divergent center during the development of Fung-Wong, and its convergent level was high in its life cycle,
with the most highest up to 400 hPa when it became stronger. After the typhoon landed in the provinces of
Taiwan and Fujian, respectively, its convergent center at lower levels was slowly detached from the
divergent center at high levels and the convergent height was also depressed from high levels to lower
levels. Gradually, this weakened the intensity of Fung-Wong. This kind of weakening was slow and
Fung-Wong maintained its circulation for a long time over land because of its very thick convergent height.
Analyses on wind partitioning provided one possible explanation to why Fung-Wong stayed for a long time
after it landed. Furthermore, the asymmetric vertical ascending motion was induced by the asymmetric
convergence at lower levels. In general, when typhoons (such as Fung-Wong) land, the rainfall region
coincides with that of the convergence region (indicated by the irrotational component at lower layers).
This means that the possible rainfall regions may be diagnosed from the convergent area of the irrotational
component. For an observational experiment on typhoons, the convergent region may be considered as a
key observational region.
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| 关 键 词： | wind partitioning typhoon Fung-Wong structure analysis |
ANALYSES OF WIND STRUCTURE OF TYPHOON FUNG-WONG (2008) AND ITS RELATION TO PRECIPITATION REGION |
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| ZHOU Yu-shu and LIU Li-ping.ANALYSES OF WIND STRUCTURE OF TYPHOON FUNG-WONG (2008) AND ITS RELATION TO PRECIPITATION REGION[J].Journal of Tropical Meteorology,2009,15(2):192-203. |
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| Authors: | ZHOU Yu-shu and LIU Li-ping |
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| Institution: | 1. Laboratory of Cloud-Precipitation Physics and Severe Storms (LACS), Institute of Atmospheric Physics Chinese Academy of Sciences, Beijing 100029, China; 2. State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081, China) |
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| Abstract: | Using real analysis data of 1°×1° resolution of the National Center for Environmental Prediction/National Center for Atmospheric Research (NCEP/NCAR), the nondivergent wind component and irrotational wind component obtained by the harmonic-cosine(H-C) method, and the wind structure of Typhoon Fung-Wong (coded 0808 in China) in 2008 was analyzed. The results indicated that the irrotational component was advantageous over the total wind in reflecting both the changes in convergent height and the asymmetrical convergence of Fung-Wong. In Fung-Wong, the nondivergent component was larger than the irrotational component, but the latter was much more variable than the former, which was obtained only from the wind partition method. Further analyses on the irrotational component demonstrated that the location of the convergent center at lower levels was almost the same as the divergent center during the development of Fung-Wong, and its convergent level was high in its life cycle, with the most highest up to 400 hPa when it became stronger. After the typhoon landed in the provinces of Taiwan and Fujian, respectively, its convergent center at lower levels was slowly detached from the divergent center at high levels and the convergent height was also depressed from high levels to lower levels. Gradually, this weakened the intensity of Fung-Wong. This kind of weakening was slow and Fung-Wong maintained its circulation for a long time over land because of its very thick convergent height. Analyses on wind partitioning provided one possible explanation to why Fung-Wong stayed for a long time after it landed. Furthermore, the asymmetric vertical ascending motion was induced by the asymmetric convergence at lower levels. In general, when typhoons (such as Fung-Wong) land, the rainfall region coincides with that of the convergence region (indicated by the irrotational component at lower layers). This means that the possible rainfall regions may be diagnosed from the convergent area of the irrotational component. For an observational experiment on typhoons, the convergent region may be considered as a key observational region. |
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| Keywords: | wind partitioning typhoon Fung-Wong structure analysis |
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