Variations in High-frequency Oscillations of Tropical Cyclones over the Western North Pacific

查看全文 作　　者：Shumin [1]CHEN;Weibiao [1]LI;Zhiping [1]WEN;Mingsen [1,2]ZHOU;Youyu [3]LU;Yu-Kun [4]QIAN;Haoya [1]LIU;Rong [1]FANG

机构地区：[1]School of Atmospheric Sciences/Center for Monsoon and Environment Research/Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies, Sun Yat-Sen University;[2]Guangzhou Institute of Tropical and Marine Meteorology, China Meteorological Administration;[3]Bedford Institute of Oceanography, Fisheries and Oceans Canada;[4]State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology,Chinese Academy of Sciences

出　　处：《Advances in Atmospheric Sciences》索引2018年第35卷第4期,共12页

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 41405048, 41675043, 41375050, 41205032 and 41775094);Independent Research Project Program of State Key Laboratory of Tropical Oceanography (Grant No. LTOZZ1603) 摘　　要：Variations in the high-frequency oscillations of tropical cyclones(TCs) over the western North Pacific(WNP) are studied in numerical model simulations. Power spectrum analysis of maximum wind speeds at 10 m(MWS_(10)) from an ensemble of15 simulated TCs shows that oscillations are significant for all TCs. The magnitudes of oscillations in MWS_(10) are similar in the WNP and South China Sea(SCS); however, the mean of the averaged significant periods in the SCS(1.93 h) is shorter than that in the open water of the WNP(2.83 h). The shorter period in the SCS is examined through an ensemble of simulations,and a case simulation as well as a sensitivity experiment in which the continent is replaced by ocean for Typhoon Hagupit(2008). The analysis of the convergence efficiency within the boundary layer suggests that the shorter periods in the SCS are possibly due to the stronger terrain effect, which intensifies convergence through greater friction. The enhanced convergence strengthens the disturbance of the gradient and thermal wind balances, and then contributes to the shorter oscillation periods in the SCS. 关键词：热带气旋高周波太平洋摆动西方模型模拟 SCS 光谱分析

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Variations in High-frequency Oscillations of Tropical Cyclones over the Western North Pacific

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