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Revisiting the response of western North Pacific tropical cyclone intensity change to vertical wind shear in different directions

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Atmospheric and Oceanic Science Letters 2021年第3期14卷 42-48页

作者： Xiuji Liang Qingqing Li Key Laboratory of Meteorological Disaster of the Ministry of Education Nanjing University of Information Science and TechnologyNanjingChina State Key Laboratory of Severe Weather Chinese Academy of Meteorological SciencesBeijingChina

The effect of vertical wind shear(VWS)directions on the change in western North Pacific tropical cyclone(TC)intensity is revisited in this *** show that the differences in the correlations between VWS in different orientations and the change in TC nondimensional intensity highly diminish,although slight differences are still *** subtle differences in the correlations are likely associated with different synoptic-scale patterns at upper and lower *** result suggests that,in addition to thermodynamic effects,dynamic roles of the synoptic-scale patterns associated with the VWS should also be taken into account when the authors examine how VWS in different directions affects TC intensity change.

关键词： Tropical cyclone Intensity change Vertical wind shear direction large-scale pattern

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Three Types of Tropical Waves Related to Tropical Cyclogenesis over the Western North Pacific

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Atmospheric and Oceanic Science Letters 2009年第6期2卷 321-326页

作者： CHEN Guang-Hua Center for Monsoon System Research Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100190 China

The present study applies a space-time filter to identify three dominant types of tropical waves: Madden-Julian oscillations (MJOs), equatorial Rossby (ER) waves, and tropical depression (TD)-type disturbances. The impacts of these waves on tropical cyclones (TCs) were investigated based on 131 observations during the period 2000 07. The results suggest that 72% of TC geneses were related to the joint impacts of more than one type of wave. The composites for cases in different categories reveal that TCs related to the concurrence of the three types of waves have strong and large initial vortices at the time of TC genesis. In the absence of the MJO, ERand TD-related TC genesis, embedded in easterly flow, exhibits a relatively fast initiation process and gives rise to a relatively small scale vortex. In contrast, without the ER wave contribution, TCs associated with ER and TD waves did not require strong convection at the time of genesis because an initial vortex can rapidly develop in the MJO active phase through persistent energy transfer. The MJO-related TC geneses were scattered in geographic distribution, as opposed to the clustered and eastward shift observed for genesis cases without contributions from MJOs.

关键词： large-scale pattern tropical waves tropical cyclogenesis western North Pacific

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