GAN Quan.The Heavy Rainfall Event over Shanxi during 21-22th July 2013[J].Journal of Chengdu University of Information Technology,2019,(01):77-82.[doi:10.16836/j.cnki.jcuit.2019.01.015]
2013年7月21-22日陕西省大暴雨天气诊断分析
- Title:
- The Heavy Rainfall Event over Shanxi during 21-22th July 2013
- 文章编号:
- 2096-1618(2019)01-0077-06
- Keywords:
- synoptic dynamics; rainstorm diagnosis; MPV; water vapor
- 分类号:
- P458.1+21.1
- 文献标志码:
- A
- 摘要:
- 为进一步提高陕西省暴雨的预报水平,利用常规气象资料、NCEP资料和卫星云图资料,对2013年7月21-22日陕西省发生区域性暴雨过程的天气形势、物理因子进行诊断分析,结果表明: 500 hPa西风槽配合700 hPa切变线以及低空西南急流是本次过程的主要影响系统,暴雨落区对应500 hPa西风槽附近的上升区,低空急流的左前侧。西太平洋副热带高压在低槽东移过程中有明显西伸加强的过程,进一步加深了低槽,使降水增强。暴雨发生所需的水汽主要来源于南海,水汽辐合中心与强对流云团有很好的对应。暴雨发生所需的能量来自于中低层对流不稳定能量的释放,并且暴雨的发生与暴雨落区北侧中高层“干入侵”有关,暴雨区低层存在着对流不稳定。
- Abstract:
- In order to improve the forecast ability about the rainstorm in Shanxi province, the circulation background and physical factors of the regional rainstorm in Shanxi province on July 2013 21-22 are diagnosed based on conventional meteorological data, NCEP data and satellite cloud images. The result shows that the rainstorm is affected by 500 hPa westerly trough, 700 hPa shear line and low-level southwest jet. The rainstorm area is mainly located in the rising zone near the 500 hPa westerly trough, and the left front side of the low-level jet. The West Pacific subtropical high has a markedly enhanced westward process during the eastward movement of the trough, further deepening the low trough and increasing precipitation. The abundant water vapor needed for rainstorm occurs mainly from the South China SeaMoreover, the water vapor convergence center is in good correspondence with the strong convective cloud cluster. The rainstorm occurred in the energy required from the low level of convective instability energy release. At the same time, the occurrence of rainstorm is related to the "dry intrusion" of the upper and middle levels in the north side of the rainstorm area, and the rainstorm convective instability.
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备注/Memo
收稿日期:2018-03-16基金项目:四川省重点实验室科技发展基金资助项目(2017-青年-11)