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《Transactions of Atmospheric Sciences》 2018-05
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Interdecadal variations in the relationship between the intense tropical cyclones over the Western North Pacific Ocean and the ENSO

TAO Li;LAN Yufeng;KONG Chengcheng;Key Laboratory of Meteorological Disaster,Ministry of Education(KLME),Nanjing University of Information Science & Technology;Guangxi Meteorological Training Centre;Jingyuan Meteorological Bureau,Guyuan,Ningxia;  
The interdecadal variations of the relationship between the intense tropical cyclone(TC)over the western North Pacific Ocean(WNP)and the El Nio-Southern Oscillation(ENSO),were examined based on the TC Best Track data(JTWC,CMA,and JMA)and the reanalysis data of the NCAR/NCEP.It was determined that during the period ranging from 1960 to 1971(first examined period),the intense TC frequencies and the NDJ Nio3.4were not statistically correlated.Meanwhile,during the period ranging from 1983 to 2014(second examined period),they were found to be closely correlated.Moreover,the differences in the life spans and genesis locations of TC45 between the El Nio developing years and the La Nia developing years had become enlarged in the more recent years,when compared to those during the prior period.The results of this study’s analysis revealed that the westward extensions of the SSTA over the tropical Pacific Ocean during the more recent period were key factors in the enhancement of the relationship between the Nio3.4 index and the annual TC45 frequency.The extensions of the SSTA caused significant increases(decreases)of the relative humidity in the southeastern quadrant of the tropical WNP for the El Nio(La Nia)developing years during the period ranging from 1983 to 2014,which was favorable(unfavorable)to the TC genesis and affected the TC45 frequency variations with the ENSO events during the more recent period.This was due to the fact that the TC in southeastern quadrant was more likely to intensify into the TC45.During the period ranging from 1983 to 2014,more(less)TC45 occurred in the southeastern quadrant for the El Nio(La Nia)developing years.
【Fund】: 国家重点研发计划项目(2016YFA0600402);; 国家自然科学基金资助项目(41375098);; 江苏高校优势学科建设工程资助项目(PAPD)
【CateGory Index】: P732
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