Analyzing the influences of two types of El Nino on Tropical Cyclone Genesis with a modified genesis potential index
Yang, YX; Yang, L; Wang, FM; yangyx@qdio.ac.cn
2017
发表期刊CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY
卷号35期号:2页码:452-465
摘要To understand the impacts of large-scale circulation during the evolution of El Nino cycle on tropical cyclones (TC) is important and useful for TC forecast. Based on best-track data from the Joint Typhoon Warning Center and reanalysis data from National Centers for Environmental Prediction for the period 1975-2014, we investigated the influences of two types of El Nino, the eastern Pacific El Nino (EP-El Nino) and central Pacific El Nino (CP-El Nino), on global TC genesis. We also examined how various environmental factors contribute to these influences using a modified genesis potential index (MGPI). The composites reproduced for two types of El Nino, from their developing to decaying phases, were able to qualitatively replicate observed cyclogenesis in several basins except for the Arabian Sea. Certain factors of MGPI with more influence than others in various regions are identified. Over the western North Pacific, five variables were all important in the two El Nino types during developing summer (July-August-September) and fall (OctoberNovember-December), and decaying spring (April-May-June) and summer. In the eastern Pacific, vertical shear and relative vorticity are the crucial factors for the two types of El Nino during developing and decaying summers. In the Atlantic, vertical shear, potential intensity and relative humidity are important for the opposite variation of EP- and CP-El Ninos during decaying summers. In the Southern Hemisphere, the five variables have varying contributions to TC genesis variation during peak season (January-February-March) for the two types of El Nino. In the Bay of Bengal, relative vorticity, humidity and omega may be responsible for clearly reduced TC genesis during developing fall for the two types and slightly suppressed TC cyclogenesis during EP-El Nino decaying spring. In the Arabian Sea, the EP-El Nino generates a slightly positive anomaly of TC genesis during developing falls and decaying springs, but the MGPI failed to capture this variation.
部门归属[Yang Yuxing; Wang Faming] Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Wave, Qingdao 266071, Peoples R China; [Yang Yuxing; Wang Faming] Qingdao Natl Lab Marine Sci & Technol, Lab Ocean Dynam & Climate, Qingdao 266071, Peoples R China; [Yang Yuxing; Yang Lei] Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou 510301, Peoples R China
关键词Two Types Of El Nino Tropical Cyclone (Tc) Modified Genesis Potential Index
资助项目LTO
文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/16435
专题热带海洋环境国家重点实验室(LTO)
通讯作者yangyx@qdio.ac.cn
推荐引用方式
GB/T 7714
Yang, YX,Yang, L,Wang, FM,et al. Analyzing the influences of two types of El Nino on Tropical Cyclone Genesis with a modified genesis potential index[J]. CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY,2017,35(2):452-465.
APA Yang, YX,Yang, L,Wang, FM,&yangyx@qdio.ac.cn.(2017).Analyzing the influences of two types of El Nino on Tropical Cyclone Genesis with a modified genesis potential index.CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY,35(2),452-465.
MLA Yang, YX,et al."Analyzing the influences of two types of El Nino on Tropical Cyclone Genesis with a modified genesis potential index".CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY 35.2(2017):452-465.
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