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Modulation of Tropical Cyclogenesis Location and Frequency over the Indo-Western North Pacific by the Intraseasonal Indo-Western Pacific Convection Oscillation during the Boreal Extended Summer
Wang, QY; Li, JP; Li, YJ; Zhang, JW; Zheng, JY; ljp@bnu.edu.cn
2018
Source PublicationJOURNAL OF CLIMATE
Volume31Issue:4Pages:1435-1450
AbstractThe influence of the intraseasonal Indo-western Pacific convection oscillation (IPCO) on tropical cyclone (TC) genesis location and frequency over the Indo-western North Pacific (WNP) during the boreal extended summer (May-October) is explored. Observational analysis shows that the impacts of the intraseasonal IPCO on TCs over the Indo-WNP include an evident "phase lock of TC genesis location'' and distinct differences in TC frequency. In the WNP, in the positive intraseasonal IPCO phase, the atmosphere gains heat through the release of latent heat in cumulus convective condensation, and the anomalous cyclonic circulation weakens the western Pacific subtropical high (WPSH) and enhances TC genesis, thereby tending to produce many more TCs. Moreover, the diminished WPSH and the westward shift of the centers of anomalous cyclonic circulations lock TC genesis locations to the west WNP and lower latitudes (around 5 degrees-20 degrees N), especially in the South China Sea. The almost opposite situation occurs in a negative phase. In the north Indian Ocean, the total TC genesis frequencies in the two intraseasonal IPCO phases are approximate. However, in the positive intraseasonal IPCO phase, the environmental conditions to the north of 13 degrees N are similar to those in the WNP except without the WPSH control, whereas south of 13 degrees N the situation is reversed, leading to a northward shift of the TC genesis location (around 13 degrees-20 degrees N). The negative phase reflects an opposite situation.
Department[Wang, Qiuyun; Li, Jianping] Beijing Normal Univ, Coll Global Change & Earth Syst Sci, Beijing, Peoples R China; [Li, Jianping] Beijing Normal Univ, State Key Lab Earth Surface Proc & Resource Ecol, Beijing, Peoples R China; [Li, Jianping] Qingdao Natl Lab Marine Sci & Technol, Lab Reg Oceanog & Numer Modeling, Qingdao, Peoples R China; [Li, Yanjie] Chinese Acad Sci, Inst Atmospher Phys, State Key Lab Numer Modeling Atmospher Sci & Geop, Beijing, Peoples R China; [Zhang, Jingwen] Chengdu Meteorol Bur, Chengdu, Sichuan, Peoples R China; [Zheng, Jiayu] Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Guangdong, Peoples R China
Subject AreaMeteorology & Atmospheric Sciences
Funding ProjectLTO
Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/17101
Collection热带海洋环境国家重点实验室(LTO)
Corresponding Authorljp@bnu.edu.cn
Recommended Citation
GB/T 7714
Wang, QY,Li, JP,Li, YJ,et al. Modulation of Tropical Cyclogenesis Location and Frequency over the Indo-Western North Pacific by the Intraseasonal Indo-Western Pacific Convection Oscillation during the Boreal Extended Summer[J]. JOURNAL OF CLIMATE,2018,31(4):1435-1450.
APA Wang, QY,Li, JP,Li, YJ,Zhang, JW,Zheng, JY,&ljp@bnu.edu.cn.(2018).Modulation of Tropical Cyclogenesis Location and Frequency over the Indo-Western North Pacific by the Intraseasonal Indo-Western Pacific Convection Oscillation during the Boreal Extended Summer.JOURNAL OF CLIMATE,31(4),1435-1450.
MLA Wang, QY,et al."Modulation of Tropical Cyclogenesis Location and Frequency over the Indo-Western North Pacific by the Intraseasonal Indo-Western Pacific Convection Oscillation during the Boreal Extended Summer".JOURNAL OF CLIMATE 31.4(2018):1435-1450.
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