Journal of Arid Meteorology ›› 2022, Vol. 40 ›› Issue (1): 73-83.DOI: 10.11755/j.issn.1006-7639(2022)-01-0073

• Articles • Previous Articles     Next Articles

Analysis of mechanism of topographic influence and meso-scale convective characteristics of an extremely severe rainfall affected by typical easterly wave

HU Zhenju1,2(), LI Lu2, HUANG Xiaoyu3, HE Binwen2, YE Rixin2   

  1. 1. Key Laboratory of Hunan Province for Meteorological Disaster Prevention and Mitigation, Changsha 410118, China
    2. Changde Meteorological Bureau of Hunan Province, Changde 415000, Hunan, China
    3. National Meteorological Centre, Beijing 100081, China
  • Received:2020-12-22 Revised:2021-04-28 Online:2022-02-28 Published:2022-02-28


胡振菊1,2(), 黎璐2, 黄小玉3, 何炳文2, 叶日新2   

  1. 1.气象防灾减灾湖南省重点实验室,湖南 长沙 410118
    2.湖南省常德市气象局,湖南 常德 415000
    3.国家气象中心,北京 100081
  • 作者简介:胡振菊(1971— ),女,硕士,高级工程师,主要从事天气分析及数值模式检验研究. E-mail:
  • 基金资助:


Based on conventional observation data, regional automatic station data of Hunan Province, NCEP reanalysis data and Changde Doppler radar data, the mesoscale characteristic of extreme rainstorms occurring repeatedly in the north of Hunan Province from 8 to 15 August 2016 affected by several easterly waves was analyzed comprehensively. The effect of the Wuling mountains topography on rainfall increase was further verified by WRF-ARW mesoscale numerical experiments. The results are as follows: (1) After the typhoon 1604 landing at Shenzhen of Guangdong Province and moving northwestward and the typhoon 1605 moving northward, the western Pacific subtropical high rapidly extended westward and controled east China and coastal areas. At this time, the easterly wave disturbance at the bottom of the subtropical high provided the circulation background for extreme rainstorms. (2) The non-uniform heating near the ground provided sufficient thermal instability for the strong convection near the easterly wave trough, the surface mesoscale convergence line played an important role in triggering and strengthening the convection. (3) During the eastward movement of the boundary-layer warm moist air, a deep mesoscale vortex formed in east side of the Wuling mountains, which was the main reasons for the extreme rainstorm formation. (4) The topographic numerical sensitivity experiment further verified that the existence of the Wuling mountains was beneficial to the development and maintenance of strong convection on the east side of the mountain under the guidance of the easterly wind flow.

Key words: easterly wave, extreme precipitation, the Wuling mountains, orographic experiment



关键词: 东风波, 极端强降水, 武陵山脉, 地形敏感性试验

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