| 低空急流在一次持续性暴雨过程中的作用 |
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| 引用本文： | 周长春,吴蓬萍.低空急流在一次持续性暴雨过程中的作用[J].四川气象,2013(4):30-34. |
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| 作者姓名： | 周长春 吴蓬萍 |
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| 作者单位： | [1]四川省气象台,成都610072 [2]中国气象局成都高原气象研究所,成都610072 |
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| 基金项目： | 中国气象局预报员专项项目（CMAYBY2013-059）,川气课题2013-预研-01,中国气象局成都高原气象研究所开放实验室课题基金项目（BROP201331） |
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| 摘 要： | 本文利用常规高空观测、地面加密自动站和NCEP再分析资料,对2012年8月30日～9月1日发生在四川盆地东部的一次持续性暴雨过程进行了分析.结果表明,过程期间低层西南风风速和雨强具有明显的日变化特征,低层西南风风速变化表明西南低空急流具有日变化特征;低空急流的日变化使得其对暴雨区的水汽、热力和动力条件的输送也具有日变化,从而造成暴雨过程期间雨强在夜间增强白天减弱;低空急流及其输送的水汽、热力和动力条件主要位于700hPa层附近.
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| 关 键 词： | 持续性暴雨 低空急流 日变化特性 700hPa |
The Role of Low-Level Jet in a Continuous Rainstorm |
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| ZHOU Changchun,WU Pengping.The Role of Low-Level Jet in a Continuous Rainstorm[J].Journal of Sichuan Meteorology,2013(4):30-34. |
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| Authors: | ZHOU Changchun WU Pengping |
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| Institution: | 1. Siehuan Meteorological Observatory, Chengdu 610072, China ; 2. Institute of Plateau Meteorology, CMA , Chengdu 610072, China) |
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| Abstract: | A continuous rainstorm in the eastern Sichuan the conventional data, intensive surface observation data and Basin during Aug 30th to Sept lth, 2012, is analyzed by using NCEP reanalysis data. The results show that the southwesterly wind speed and the rainfall intensity varied from day and nigh. Southwesterly low - level jet changed similar with southwesterly wind speed at the same time. The diurnal variation of low - level jet causes the same diurnal variation of the vapor, energy and dynamic transport, those caused the rainfall intensity rising in day and falling in night. The vapor, energy and dynamic factors depending on low - level jet mainly concentrates at the 700hPa highly. |
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| Keywords: | continuous rainstorm low - level jet diurnal variation 700hPa |
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