| 潜热对江淮地区一次特大暴雨过程维持机制研究 |
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| 引用本文： | 邵立瑛,郑淋淋,朱红芳,王悦,章颖.潜热对江淮地区一次特大暴雨过程维持机制研究[J].新疆气象,2024,18(4):70-77. |
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| 作者姓名： | 邵立瑛 郑淋淋 朱红芳 王悦 章颖 |
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| 作者单位： | 安徽省气象台,,, |
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| 基金项目： | 安徽省自然科学基金江淮气象联合基金项目(2208085UQ11),国家自然科学(41705029) |
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| 摘 要： | 2020年7月17日20时～18日20时，在淮河至长江之间出现大范围降水，短时强降水维持时间长、雨强大。此次降水发生的环流背景是：中高层多短波槽波动，伴随低层的低涡发展以及低空急流加强。强降水主要发生在低涡、切变线南侧的暖区中，降水主要分为两个阶段：第一阶段（17日20时～18日06时）强降水发生在暖式切变线和第一个低涡的暖区中，是中层潜热释放导致中层扰动形成的急流自激过程。中层位涡发展，中层扰动加强，中层扰动导致其南部急流加强，急流的自激机制形成向南、向下的上升运动波动，当水汽、能量和上升运动区配合时，形成强降水。第二阶段（18日07时～18日20时）强降水发生在第二个低涡的暖区。中高层潜热释放形成扰动，导致深厚的中低层急流发展，形成了高、中、低层一致的上升运动区。同时配合深厚低空急流带来的水汽和能量条件，形成了强降水深对流。因此整个过程的潜热释放对强降水的发展有重要作用。
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| 关 键 词： | 强降水 潜热 位涡 急流 维持机制 |
| 收稿时间： | 2023/4/12 0:00:00 |
| 修稿时间： | 2024/1/17 0:00:00 |
The maintenance role of latent heat on a heavy rainfall event in the Yangtze-Huaihe River Basin in China |
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| Shao Liying,Zheng Linlin,Zhu Hongfang,Wang Yue and Zhang Ying.The maintenance role of latent heat on a heavy rainfall event in the Yangtze-Huaihe River Basin in China[J].Bimonthly of Xinjiang Meteorology,2024,18(4):70-77. |
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| Authors: | Shao Liying Zheng Linlin Zhu Hongfang Wang Yue and Zhang Ying |
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| Institution: | Anhui Meteorological Observatory,Hefei ,P R China,Anhui Meteorological Observatory,Hefei ,P R China,Anhui Meteorological Observatory,Hefei ,P R China,Anhui Meteorological Observatory,Hefei ,P R China,Anhui Meteorological Observatory,Hefei ,P R China |
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| Abstract: | A heavy rainfall event occurred in the Yangtze-Huaihe River Basin during 17-18th July 2020, with a long duration of intense hourly precipitation. The circulation included shortwave troughs at middle-upper levels, accompanied by the development of vortexes and low-level jet in the boundary layer. Intense precipitation occurred at the warm sector and can be divided into two stages. Stage 1 (20:00 on 17th - 06:00 on 18th) occurred at the warm sector of warm-shear and the first vortex. Stage 1 is the process of jet self-excitation caused by disturbances in the middle layer which is induced by latent heat in the middle layer. Potential vorticity led to development of middle level disturbance and the southern jet due to it. The jet self-excited mechanism formed upward and downward motion fluctuations. Intense precipitation is formed when water vapor, energy, and upward motion collaborated. Stage 2 (07:00-20:00 on 18th) precipitation occurred at the warm sector of the second vortex. The release of latent heat in middle-upper layers give rise to disturbances, which is leading to the development of deep middle-lower level jets. A consistent upward motion zone in high, middle, and low layers formed. At the same time, combined with high water vapor and energy brought by deep low-level jet, the deep convection of intense precipitation developed. Therefore, the release of latent heat plays an important role in the maintenance of intense precipitation. |
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| Keywords: | intense precipitation latent heat potential vorticity jet maintenance mechanism |
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