| 西行台风背景下云南一次短时强降水过程的成因分析 |
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| 引用本文： | 朱莉,王治国,李华宏,赵宁坤,马志敏,王曼,连钰.西行台风背景下云南一次短时强降水过程的成因分析[J].热带气象学报,2020,36(6):744-758. |
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| 作者姓名： | 朱莉 王治国 李华宏 赵宁坤 马志敏 王曼 连钰 |
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| 作者单位： | 1.云南省气象台，云南 昆明 650034 |
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| 基金项目： | 国家自然科学基金项目41805037国家自然科学基金项目41565004中国气象局预报员专项CMAYBY2020-119 |
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| 摘 要： | 利用云南省自动气象站雨量资料、卫星和闪电定位仪资料、雷达回波资料、NCEP 1 °×1 °再分析资料和地面、高空常规观测资料对云南一次典型的台风前侧短时强降水过程的成因进行分析，结果表明:在2017年13号台风“天鸽”西行影响云南的天气背景之下，短时强降水出现在台风前侧700 hPa风速辐合区和边界层辐合线附近。台风前侧偏东低空急流向云南境内输送水汽和能量，边界层辐合线触发垂直上升运动，700 hPa风速辐合区利于垂直上升运动的维持和加强，促使水汽的辐合与不稳定能量的释放，引发短时强降水。在中等强度深层垂直风切变的作用下，云南东部中尺度对流系统(MCS)频繁产生并向西传播发展，MCS相互作用组织成飑线系统，在东北气流的引导下，飑线从云南中部移至云南西南部，MCS和飑线是大范围短时强降水的直接影响系统。
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| 关 键 词： | 西行台风 短时强降水 飑线 概念模型 云南 |
| 收稿时间： | 2020-04-25 |
CASUAL ANALYSIS OF A SHORT-TERM HEAVY RAIN EVENT IN YUNNAN PROVINCE UNDER THE BACKGROUND OF WESTWARD MOVING TYPHOON |
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| ZHU Li,WANG Zhi-guo,LI Hua-hong,ZHAO Ning-kun,MA Zhi-min,WANG Man,LIAN Yu.CASUAL ANALYSIS OF A SHORT-TERM HEAVY RAIN EVENT IN YUNNAN PROVINCE UNDER THE BACKGROUND OF WESTWARD MOVING TYPHOON[J].Journal of Tropical Meteorology,2020,36(6):744-758. |
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| Authors: | ZHU Li WANG Zhi-guo LI Hua-hong ZHAO Ning-kun MA Zhi-min WANG Man LIAN Yu |
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| Institution: | 1.Yunnan Meteorological Observatory, Kunming 650034, China2.Yunnan Institute of Meteorological Sciences, Kunming 650034, China |
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| Abstract: | In the present study, the cause of a typical short-term heavy rainfall event in front of a typhoon in Yunnan Province was analyzed by using precipitation data from automatic stations in Yunnan Province, satellite and lighting locator data, radar echo data and NCEP 1 °×1 ° reanalysis data. The results showed that under the influence of the westward movement of Typhoon Hato, the 13th typhoon in 2017, a short-term heavy rainfall occurred near the 700 hPa wind velocity convergence zone and the boundary layer convergence line in front of the typhoon. The easterly low-level jet stream in front of the typhoon transported water vapor and energy to Yunnan. The convergence line in the boundary layer triggered vertical upward movement. The convergence zone of 700 hPa wind velocity was conducive to the maintenance and development of vertical upward movement, which promoted the convergence of water vapor and the release of unstable energy and thus caused short-term heavy rainfall. Under the influence of moderate deep vertical wind shear, mesoscale convective systems (MCS) occurred frequently in the east part of Yunnan, and then propagated westward. The MCS interacted and formed the squall line system. Under the influence of the northeast airflow, the squall line moved from central Yunnan to southwest Yunnan. MCS and squall lines were the direct influence systems of large-scale short-term heavy rainfall. |
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| Keywords: | westward moving typhoon short-term heavy rainfall squall line conceptual model Yunnan Province |
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