安徽农业科学2011，Vol.39Issue(31)：19442-19445,19525,5.
临沂一次局地大暴雨成因分析
Analysis on Formation Reason of a Local Heavy Rainstorm in Linyi Area
刘英杰 1张奎松 2王庆华 1甄淑红3
作者信息
- 1. 山东省临沂市气象局,山东临沂276004
- 2. 山东省临沭县气象局,山东临沭276700
- 3. 山东省临沂市机场,山东临沂276004
- 折叠
摘要
Abstract
[Objective]The research aimed to study formation reason of a local heavy rainstorm process in linyi from night on August 3 to early morning on 4th, 2010. [Method] Based on MICAPS weather chart, actual situation data of NECP analysis field, data of automatic encryption station and Doppler radar product, a local heavy rainstorm and extra torrential rain process in Linyi from night on August 3 to early morning on 4th, 2010 was detailedly analyzed from weather background, meso and small-scale characteristics, physical mechanisms of occurrence and development of meso and small-scale systems. The formation reason of heavy rainstorm process was discussed. Moreover, we tried to find some occurrence rules of short-time strong precipitation. [ Result] The local heavy rainstorm process had big short-time rainfall and obvious local characteristic. The main influence systems were subtropical high, westerly trough and meso and small-scale ground low pressures. It was affected by many systems which had different scales and heights. The upper-cold-down-warm unstable stratification accumulated a large number of unstable energy, which was basic condition of strong precipitation occurrence. It was convergence shear at the bottom layer of airspace. The vertical shear and turbosphere of deep and thick southwest-northwest-easterly airflow were at airspace. The common effect of up and down systems triggered generation of updraft, and made unstable energy release. For the release of unstable energy, after northwest airflow was cut off and disappeared, the updraft made southwest airflow develop upward. It linked with easterly wave to form new vertical shear, which was one reason of long duration of strong precipitation. The southwest airflow at the edge of subtropical high was water vapor source of precipitation process, which provided sufficient water vapor supply for generation of heavy rainstorm. The system which was developing and strengthening would make moving speed of system slow down. Then, the rainfall increased. It was one reason of long duration of strong precipitation. [ Conclusion] The research accumulated certain experience for forecast work in future.关键词
局地大暴雨/成因分析/临沂Key words
Local heavy rainstorm/ Formation reason analysis/ Linyi分类
天文与地球科学引用本文复制引用
刘英杰,张奎松,王庆华,甄淑红..临沂一次局地大暴雨成因分析[J].安徽农业科学,2011,39(31):19442-19445,19525,5.
