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Variations in High-frequency Oscillations of Tropical Cyclones over the Western North Pacific
Chen, SM; Li, WB; Wen, ZP; Zhou, MS; Lu, YY; Qian, YK; Liu, HY; Fang, R; eeslwb@mail.sysu.edu.cn
2018
Source PublicationADVANCES IN ATMOSPHERIC SCIENCES
Volume35Issue:4Pages:423-434
AbstractVariations 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 (MWS10) from an ensemble of 15 simulated TCs shows that oscillations are significant for all TCs. The magnitudes of oscillations in MWS10 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.
Department[Chen, Shumin; Li, Weibiao; Wen, Zhiping; Zhou, Mingsen; Liu, Haoya; Fang, Rong] Sun Yat Sen Univ, Sch Atmospher Sci, Ctr Monsoon & Environm Res, Guangdong Prov Key Lab Climate Change & Nat Disas, Guangzhou 510275, Guangdong, Peoples R China; [Zhou, Mingsen] China Meteorol Adm, Guangzhou Inst Trop & Marine Meteorol, Guangzhou 510062, Guangdong, Peoples R China; [Lu, Youyu] Fisheries & Oceans Canada, Bedford Inst Oceanog, Dartmouth, NS B2Y 4A2, Canada; [Qian, Yu-Kun] Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou 510301, Guangdong, Peoples R China
KeywordTropical Cyclone High-frequency Oscillation Western North Pacific South China Sea
Subject AreaMeteorology & Atmospheric Sciences
Funding ProjectLTO
Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/17085
Collection热带海洋环境国家重点实验室(LTO)
Corresponding Authoreeslwb@mail.sysu.edu.cn
Recommended Citation
GB/T 7714
Chen, SM,Li, WB,Wen, ZP,et al. Variations in High-frequency Oscillations of Tropical Cyclones over the Western North Pacific[J]. ADVANCES IN ATMOSPHERIC SCIENCES,2018,35(4):423-434.
APA Chen, SM.,Li, WB.,Wen, ZP.,Zhou, MS.,Lu, YY.,...&eeslwb@mail.sysu.edu.cn.(2018).Variations in High-frequency Oscillations of Tropical Cyclones over the Western North Pacific.ADVANCES IN ATMOSPHERIC SCIENCES,35(4),423-434.
MLA Chen, SM,et al."Variations in High-frequency Oscillations of Tropical Cyclones over the Western North Pacific".ADVANCES IN ATMOSPHERIC SCIENCES 35.4(2018):423-434.
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