中国物理B ›› 2010, Vol. 19 ›› Issue (7): 79201-079201.doi: 10.1088/1674-1056/19/7/079201

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Diagnosis of dynamic process over rainband of landfall typhoon

杨文霞1, 冉令坤2, 楚艳丽3   

  1. (1)Hebei Weather Modification Office, Shijiazhuang 050021, China;Hebei Laboratory of Ecological and Enviromental Monitoring, Shijiazhuang 050021, China; (2)Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China; (3)Institute of Urban Meteorology, CMA, Beijing 100089, China
  • 出版日期:2010-07-15 发布日期:2010-07-15
  • 基金资助:
    Project supported by the National Basic Research Program of China (Grant No. 2009CB421505), the Main Direction Program of Knowledge Innovation of Chinese Academy of Sciences (KZCX2-YW-206-4), the National Natural Science Foundation of China (Grant Nos. 40875032 and 40875002), the Major Foreland Project of IAP (IAP07201) and the National Science and Technology Project, China (GYH200706042).

Diagnosis of dynamic process over rainband of landfall typhoon

Ran Ling-Kun (冉令坤)a, Yang Wen-Xia (杨文霞)bc, Chu Yan-Li (楚艳丽)d   

  1. a Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China; b Hebei Weather Modification Office, Shijiazhuang 050021, China; c Hebei Laboratory of Ecological and Enviromental Monitoring, Shijiazhuang 050021, China; d Institute of Urban Meteorology, CMA, Beijing 100089, China
  • Online:2010-07-15 Published:2010-07-15
  • Supported by:
    Project supported by the National Basic Research Program of China (Grant No. 2009CB421505), the Main Direction Program of Knowledge Innovation of Chinese Academy of Sciences (KZCX2-YW-206-4), the National Natural Science Foundation of China (Grant Nos. 40875032 and 40875002), the Major Foreland Project of IAP (IAP07201) and the National Science and Technology Project, China (GYH200706042).

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摘要： This paper introduces a new physical parameter — thermodynamic shear advection parameter combining the perturbation vertical component of convective vorticity vector with the coupling of horizontal divergence perturbation and vertical gradient of general potential temperature perturbation. For a heavy-rainfall event resulting from the landfall typhoon 'Wipha', the parameter is calculated by using National Centres for Enviromental Prediction/National Centre for Atmospheric Research global final analysis data. The results showed that the parameter corresponds to the observed 6 h accumulative rainband since it is capable of catching hold of the dynamic and thermodynamic disturbance in the lower troposphere over the observed rainband. Before the typhoon landed, the advection of the parameter by basic-state flow and the coupling of general potential temperature perturbation with curl of Coriolis force perturbation are the primary dynamic processes which are responsible for the local change of the parameter. After the typhoon landed, the disturbance is mainly driven by the combination of five primary dynamic processes. The advection of the parameter by basic-state flow was weakened after the typhoon landed.

Abstract: This paper introduces a new physical parameter — thermodynamic shear advection parameter combining the perturbation vertical component of convective vorticity vector with the coupling of horizontal divergence perturbation and vertical gradient of general potential temperature perturbation. For a heavy-rainfall event resulting from the landfall typhoon 'Wipha', the parameter is calculated by using National Centres for Enviromental Prediction/National Centre for Atmospheric Research global final analysis data. The results showed that the parameter corresponds to the observed 6 h accumulative rainband since it is capable of catching hold of the dynamic and thermodynamic disturbance in the lower troposphere over the observed rainband. Before the typhoon landed, the advection of the parameter by basic-state flow and the coupling of general potential temperature perturbation with curl of Coriolis force perturbation are the primary dynamic processes which are responsible for the local change of the parameter. After the typhoon landed, the disturbance is mainly driven by the combination of five primary dynamic processes. The advection of the parameter by basic-state flow was weakened after the typhoon landed.

Key words: thermodynamic shear advection parameter, convective vorticity vector, horizontal divergence, general potential temperature

中图分类号:  (Water in the atmosphere)

  • 92.60.Jq
92.60.Qx (Storms) 92.60.hv (Pressure, density, and temperature) 92.60.Kc (Land/atmosphere interactions) 92.60.hk (Convection, turbulence, and diffusion) 91.90.+p (Other topics in solid Earth physics)