Diagnosis of dynamic process over rainband of landfall typhoon |
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Authors: | Ran Ling-Kun Yang Wen-Xia and Chu Yan-Li |
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Institution: | Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China; Hebei Weather Modification Office, Shijiazhuang 050021, China; Hebei Laboratory of Ecological and Enviromental Monitoring, Shijiazhuang 050021, China; Institute of Urban Meteorology, CMA, Beijing 100089, China |
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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. |
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Keywords: | thermodynamic shear advection parameter convective vorticity vector horizontal divergence general potential temperature |
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