| 一次孟加拉湾风暴Akash (0701) 对我国西南地区强降水过程的影响分析 |
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| 引用本文： | 吕爱民,文永仁,李英.一次孟加拉湾风暴Akash (0701) 对我国西南地区强降水过程的影响分析[J].大气科学,2013,37(1):160-170. |
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| 作者姓名： | 吕爱民 文永仁 李英 |
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| 作者单位： | 1.中国气象科学研究院灾害天气国家重点实验室,北京 100081 |
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| 基金项目： | 国家公益性行业(气象)科研专项GYHY201106005,国家自然科学基金项目41275066、40975032 |
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| 摘 要： | 孟加拉湾地区是全球热带气旋频繁活动的海域之一,孟加拉湾风暴常对我国青藏高原和西南地区造成严重影响.孟加拉湾风暴Akash (0701) 于2007年5月15～17日引发了云南、广西等地一次持续性强降水过程.本文利用地面降水资料、NCEP(the National Centers for Atmospheric Prediction)/NCAR(the National Center for Atmospheric Research)再分析资料和JMA(Japan Meteorological agency)卫星TBB(Black Body Temperature)资料,研究Akash对我国西南地区这次强降水过程的影响.结果表明:这次强降水过程发生在Akash与青藏高原低槽密切配合的形势下.Akash登陆减弱期间其对流云团移上青藏高原,加强槽前云系引发强降水.受孟加拉湾风暴高层辐散影响,南亚高压加强并北上控制我国西南地区,这增强了降水区的高空辐散,有利于上升运动发展.同时孟加拉湾风暴为降水区提供了充足的水汽输送.降水区的水汽净流入、湿斜压性增长以及强烈条件性对称不稳定是这次强降水产生的有利条件.研究还发现,低纬高原地形对孟加拉湾风暴偏南风的强迫抬升加剧了降水区的上升运动,有助于强降水的产生.
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| 关 键 词： | 孟加拉湾 风暴 强降水 西南地区 |
| 收稿时间： | 3/7/2012 12:00:00 AM |
| 修稿时间： | 9/5/2012 12:00:00 AM |
Study of the Impact of Tropical Cyclone Akash (0701) over the Bay of Bengal on a Heavy Rainfall Event in Southwest China |
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| L&#; Aimin,WEN Yongren and LI Ying.Study of the Impact of Tropical Cyclone Akash (0701) over the Bay of Bengal on a Heavy Rainfall Event in Southwest China[J].Chinese Journal of Atmospheric Sciences,2013,37(1):160-170. |
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| Authors: | L&#; Aimin WEN Yongren and LI Ying |
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| Institution: | 1.State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 1000812.Yunnan Meteorological Serve Center, Kunming 650034 |
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| Abstract: | The Bay of Bengal is known as a breeding ground for tropical cyclones. The storm activities in the Bay of Bengal have considerable impact on the weather over the Qinghai-Xizang Plateau and southwestern China. In 2007, cyclone Akash (0701) resulted in a continuous precipitation event over southwestern China during May 15-17. In this study, the mechanism of heavy rainfall induced by Akash is investigated based on precipitation data from NOAA, NCEP/NCAR reanalysis data, and satellite TBB data from JMA (Japan Meteorological Agency). We found that heavy rainfall occurred when Akash interacted with a westerly trough over the Tibetan Plateau. The cloud clusters that separated from the Akash cloud system ascended in a northwardly direction to the lower latitude plateau strengthening the trough clouds and causing extremely heavy rainfall. Influenced by the strong divergence at the upper levels of Akash during its northward movement, the South Asia high strengthened, moved northward dominating the area over southwestern China, which enhanced the upper troposphere divergence, and in turn, strengthened Akash’s ascending motion. The storm transported large amounts of water vapor to the heavy rainfall area. The net inflow of water vapor, the growth of moist baroclinicity, and the strong conditional symmetric instability were all favorable for the development of this heavy rainfall event. We also found that the low-altitude plateau topography increased the ascending motion by forcing an uplifting southerly flow, which enhanced the heavy rainfall. |
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| Keywords: | Bay of Bengal Tropical cyclone Heavy rainfall Southwest China |
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