Recent Weakening in Interannual Variability of Mean Tropical Cyclogenesis Latitude over the Western North Pacific during Boreal Summer

作     者：Minmin WU Lei WANG Baiyang CHEN Minmin WU;Lei WANG;Baiyang CHEN

作者机构：Laboratory for Coastal Ocean Variation and Disaster PredictionCollege of Ocean and MeteorologyGuangdong Ocean UniversityZhanjiang 524088 Key Laboratory of ClimateResources and Environment in Continental Shelf Sea and Deep Sea of Department of Education of Guangdong ProvinceGuangdong Ocean UniversityZhanjiang 524088 Marine Resources Big Data Center of South China SeaSouthern Marine Science and Engineering Guangdong Laboratory(Zhanjiang)Zhanjiang 524025 

出 版 物：《Journal of Meteorological Research》 (气象学报（英文版）)

年 卷 期：2020年第34卷第6期

页      面：1183-1198页

核心收录：

学科分类：07[理学] 070601[理学-气象学] 0707[理学-海洋科学] 0815[工学-水利工程] 0706[理学-大气科学] 0816[工学-测绘科学与技术] 0824[工学-船舶与海洋工程] 0825[工学-航空宇航科学与技术] 

基　　金：the National Natural Science Foundation of China(41776031) National Key Research and Development Program of China(2018YFC1506903) Guangdong Natural Science Foundation(2015A030313796) Program for Scientific Research Start-Up Funds of Guangdong Ocean University Foundation for Returned Scholars of the Ministry of Education of China。 

主　　题：tropical cyclone cyclogenesis latitude decadal change shifting El Nino–Southern Oscillation(ENSO) western North Pacific(WNP) tropical Atlantic sea surface temperature(SST) 

摘      要：The intensity of the interannual variability(IIV)of the mean tropical cyclone(TC)genesis latitude over the western North Pacific(WNP)has been weakening significantly since the late 1990 s.It is found that the IIV of the mean TC genesis latitude depends largely on the strength of the out-of-phase relationship between TC genesis numbers in the north(north of 15°N)and south(south of 15°N)of the WNP.A weaker(stronger)north–south TC see-saw has led to a smaller(larger)IIV of the mean TC genesis latitude after(before)the late 1990 s.Different configurations of sea surface temperature(SST)anomalies are found to be responsible for the decadal changes in the north–south TC see-saw and dipole structure.Before the late 1990 s,the joint effect of SST anomalies over the tropical Pacific and tropical North Indian Ocean dominated,rendering the obvious north–south TC see-saw and larger IIV of the mean TC genesis latitude.After the late 1990 s,however,the dominant SST anomalies associated with TC genesis shift to the tropical central Pacific(CP)and tropical North Atlantic Ocean,which have weakened the north–south TC seesaw and reduced the IIV of the mean TC genesis latitude.These observed decadal changes in the configuration of SST anomalies are considered to be closely associated with the shift of the El Ni?o–Southern Oscillation(ENSO)from eastern Pacific(EP)type to the CP type during the recent decades.The results suggest that the increased influences from the tropical Atlantic Ocean have become more important to the variations of TC activity in the WNP during the recent decades.These results may have important implications for assessing the latitudinal distributions of TC-induced hazards.