| Mesoscale Diagnosis of a Torrential Rainfall Caused by a Tropical Depression |
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| 引用本文： | YU Hui,LIANG Xudong,DUAN Yihong,QI Liangbo. Mesoscale Diagnosis of a Torrential Rainfall Caused by a Tropical Depression[J]. , 2005, 19(2): 226-230 |
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| 作者姓名： | YU Hui LIANG Xudong DUAN Yihong QI Liangbo |
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| 作者单位： | Nanjing University of Information Science and Technology，Nanjing 210044 Shanghai Typhoon Institute，Shanghai 200030，Shanghai Typhoon Institute，Shanghai 200030，Shanghai Typhoon Institute，Shanghai 200030，Shanghai Meteorological Center，Shanghai 200030 |
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| 基金项目： | This study is sponsored by the National Natural Science Foundation of China under Grant Nos. 49975014 and 40275018. |
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| 摘 要： | On August 5, 2001, Shanghai was struck by a torrential rainfall due to the passage of a tropical depression (TD). The rainfall intensity has been the strongest in recent 50 years. In this paper, a set of mesoscale re-analyses data and the planetary boundary layer observation from a wind profiler are used to understand the possible mechanism of such a heavy rain. Results show that the outburst of a southerly jet in the lower atmosphere triggered the explosive development of cyclonically vertical vorticity in the region with steep potential temperature surfaces in front of the TD; while the cyclonic vorticity increased notably at higher levels due to the small atmospheric vertical stability of westerly currents in the vicinity of Shanghai. The simultaneous sharp development of cyclonic vorticity at different levels should be the main cause for the torrential rainfall.
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| 收稿时间： | 2004-02-12 |
| 修稿时间： | 2004-12-14 |
Mesoscale Diagnosis of a Torrential Rainfall Caused by a Tropical Depression |
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| YU Hui LIANG Xudong DUAN Yihong QI Liangbo. Mesoscale Diagnosis of a Torrential Rainfall Caused by a Tropical Depression[J]. Acta Meteorologica Sinica, 2005, 19(2): 226-230 |
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| Authors: | YU Hui LIANG Xudong DUAN Yihong QI Liangbo |
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| Affiliation: | Nanjing University of Information Science and Technology, Nanjing 210044;Shanghai Typhoon Institute, Shanghai 200030 Shanghai Typhoon Institute, Shanghai 200030 Shanghai Typhoon Institute, Shanghai 200030 Shanghai Meteorological Center, Shanghai 200030 |
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| Abstract: | On August 5, 2001, Shanghai was struck by a torrential rainfall due to the passage of a tropical depression (TD). The rainfall intensity has been the strongest in recent 50 years. In this paper, a set of mesoscale re-analyses data and the planetary boundary layer observation from a wind profiler are used to understand the possible mechanism of such a heavy rain. Results show that the outburst of a southerly jet in the lower atmosphere triggered the explosive development of cyclonically vertical vorticity in the region with steep potential temperature surfaces in front of the TD; while the cyclonic vorticity increased notably at higher levels due to the small atmospheric vertical stability of westerly currents in the vicinity of Shanghai. The simultaneous sharp development of cyclonic vorticity at different levels should be the main cause for the torrential rainfall. |
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| Keywords: | tropical depression torrential rainfall moist potential vorticity |
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