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Analyzing the influences of two types of El Nino on Tropical Cyclone Genesis with a modified genesis potential index
Yang Yuxing1,2,3; Yang Lei3; Wang Faming1,2
2017-03-01
Source PublicationCHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY
Volume35Issue:2Pages:452-465
SubtypeArticle
AbstractTo 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.
KeywordTwo Types Of El Nino Tropical Cyclone (Tc) Modified Genesis Potential Index
DOI10.1007/s00343-016-5295-7
Indexed BySCI
Language英语
WOS IDWOS:000396021400022
Citation statistics
Document Type期刊论文
Version出版稿
Identifierhttp://ir.qdio.ac.cn/handle/337002/136755
Collection海洋环流与波动重点实验室
Affiliation1.Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Wave, Qingdao 266071, Peoples R China
2.Qingdao Natl Lab Marine Sci & Technol, Lab Ocean Dynam & Climate, Qingdao 266071, Peoples R China
3.Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou 510301, Peoples R China
First Author Affilication中国科学院海洋研究所
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Yang Yuxing,Yang Lei,Wang Faming. 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 Yuxing,Yang Lei,&Wang Faming.(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 Yuxing,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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