Impacts of the Diurnal Cycle of Radiation on Tropical Cyclone Intensification and Structure  

作　　者：GE Xuyang MA Yue ZHOU Shunwu Tim LI 

机构地区：[1]Earth System Modeling Center, Nanjing University of Information Science and Technology [2]College of Atmospheric Science, Nanjing University of Information Science and Technology [3]Key laboratory of Meteorological Disaster, Nanjing University of Information Science and Technology [4]International Pacific Research Center, University of Hawaii Honolulu, HI 96822, USA

出　　处：《Advances in Atmospheric Sciences》2014年第6期1377-1385,共9页大气科学进展（英文版）

基　　金：sponsored by the National Natural Science Foundation of China (Grant Nos. 41275095, 41075037);the National Key Basic Research Program of China (Grant No.2012CB955204);the Key University Science Research Project of Jiangsu Province (Grant No.14KJA170005)

摘　　要：To investigate the impacts of the diurnal cycle on tropical cyclones （TCs）,a set of idealized simulations were conducted by specifying different radiation （i.e.,nighttime-only,daytime-only,full diurnal cycle）.It was found that,for an initially weak storm,it developed faster during nighttime than daytime.The impacts of radiation were not only on TC intensification,but also on TC structure and size.The nighttime storm tended to have a larger size than its daytime counterparts.During nighttime,the radiative cooling steepened the lapse rate and thus reduced the static stability in cloudy regions,enhancing convection.Diabatic heating associated with outer convection induced boundary layer inflows,which led to outward expansion of tangential winds and thus increased the storm size.To investigate the impacts of the diurnal cycle on tropical cyclones （TCs）,a set of idealized simulations were conducted by specifying different radiation （i.e.,nighttime-only,daytime-only,full diurnal cycle）.It was found that,for an initially weak storm,it developed faster during nighttime than daytime.The impacts of radiation were not only on TC intensification,but also on TC structure and size.The nighttime storm tended to have a larger size than its daytime counterparts.During nighttime,the radiative cooling steepened the lapse rate and thus reduced the static stability in cloudy regions,enhancing convection.Diabatic heating associated with outer convection induced boundary layer inflows,which led to outward expansion of tangential winds and thus increased the storm size.

关 键 词：solar shortwave radiation tropical cyclone STRUCTURE INTENSIFICATION diurnal cycle 

分 类 号：P444[天文地球—大气科学及气象学] TL631.24[核科学技术—核技术及应用]