Uptrend of the Western North Pacific Tropical Cyclone Outflow Height during 1959-2021  

作　　者：Yuan SUN Zhihao FENG Wei ZHONG Panmao ZHAI Yanluan LIN Shuo LYU 

机构地区：[1]College of Advanced Interdisciplinary Studies,National University of Defense Technology,Nanjing 211100 [2]College of Meteorology and Oceanography,National University of Defense Technology,Changsha 410073 [3]State Key Laboratory of Severe Weather,Chinese Academy of Meteorological Sciences,China Meteorological Administration,Beijing 100081 [4]Ministry of Education Key Laboratory for Earth System Modeling,Department of Earth System Science,Tsinghua University,Beijing 100084

出　　处：《Journal of Meteorological Research》2024年第2期339-350,共12页气象学报（英文版）

基　　金：Supported by the National Natural Science Foundation of China(42075035 and 42075011)。

摘　　要：Relatively little is known about the impact of global warming on the tropical cyclone(TC)outflow,despite its large contribution to TC intensity.In this study,based on the International Best Track Archive for Climate Stewardship(IBTrACS)dataset and ERA5 reanalysis data,we show that the TC outflow height has risen significantly(48.20±22.18 m decades-1)in the past decades(1959-2021)over the western North Pacific,and the rising trend tends to be sharper for stronger TCs(the uptrend of severe typhoon is 61.09±40.92 m decades-1).This rising trend of the outflow height explains the contradiction between the decrease trend of the TC outflow temperature and the increase trend of the atmospheric troposphere temperature.Moreover,possible contribution of the TC outflow height uptrend to TC intensity has also been investigated.The results show that the rise of outflow height leads to the decrease of outflow temperature,and thus an increased difference between underlying sea surface temperature(SST)and TC outflow temperature,which eventually favors the increase of TC intensity.

关 键 词：tropical cyclone outflow height global warming western North Pacific 

分 类 号：P444[天文地球—大气科学及气象学]