| 移动型与源地生消型西南涡的气候特征 |
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| 引用本文： | 宋娜,冯鑫媛.移动型与源地生消型西南涡的气候特征[J].高原山地气象研究,2021,41(1):59-67. |
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| 作者姓名： | 宋娜 冯鑫媛 |
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| 作者单位： | 成都信息工程大学大气科学学院/高原大气与环境四川省重点实验室，成都 610225 |
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| 基金项目： | 国家自然科学基金项目(41775147,91644226)；国家重点研发计划专项(2018YFC1505702) |
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| 摘 要： | 利用ERA5再分析资料与TMPA V7降水资料,对2010-2019年移动型和源地生消型两类西南涡的时空分布、移动和降水特征进行统计分析,结果表明:源地生消型和移动型西南涡年均分别为69和20例,移动型西南涡的主要源地为四川盆地,源地生消型西南涡的主要源地为九龙和四川盆地;两类西南涡均为春夏多、秋冬少,但移动型西南涡的季节差异更大,春夏季生成频次约为秋冬季的3倍;西南涡主要在夜间生成,但日间生成的西南涡中移动型占比较多;源地生消型和移动型西南涡平均生命史分别为15.4h和39.6h;移动型西南涡以偏东路径为主,春夏季移动路径明显较长,冬季移速最大,夏季最小;源地生消型西南涡降水以弱降水为主,移动型西南涡降水强度整体大于源地生消型,以强降水为主。
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| 关 键 词： | 移动型西南涡 源地生消型西南涡 时空分布 移动路径 降水特征 |
| 收稿时间： | 2021-02-21 |
Climate Characteristic of Moving-out and Non-moving-out Southwest Vortices |
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| Institution: | School of Atmospheric Science,Chengdu University of Information Technology/Plateau Atmosphere and Environment Key Laboratory of Sichuan Province,Chengdu 610225, China |
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| Abstract: | Based on ERA5 reanalysis data and TMPA V7 precipitation data, the spatial and temporal distribution, movement and precipitation characteristics of two types of southwest vortexes from 2010 to 2019 are statistically analyzed. Results indicate that the annual average of non-moving-out southwest vortices was 69 and the annual average of moving-out southwest vortices was 20. The primary genesis region of moving-out southwest vortex is Sichuan Basin and non-moving-out southwest vortex has two main sources, Sichuan Basin and Jiulong genesis region. Both types of southwest vortex are productive in spring and summer and less in fall and winter. The season difference of non-moving-out southwest vortex genesis is more significant, the genesis of moving-out southwest vortex in spring and summer is three times than that in fall and winter. Southwest vortex is mainly generated at night, most of southwest vortex generated during daytime are moving-out southwest vortexes. The average durations of two types southwest vortex are 15.4h and 39.6h. The moving-out southwest vortex mainly moves eastward and it travels longer in spring and summer . Its speed is largest in winter and smallest in summer. The precipitation intensity of moving-out vortex is stronger than non-moving-out vortex. Non-moving-out southwest vortex is mainly with light precipitation. The moving-out southwest vortex is always along with heavy precipitation. |
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