Deep Convective Clouds over the Northern Pacific and Their Relationship with Oceanic Cyclones

作     者：YI Mingjian FU Yunfei LIU Peng ZHENG Zhixia 

作者机构：University of Science and Technology of China Anhui Provincial Academy of Environmental Sciences State Key Laboratory of Severe Weather Chinese Academy of Meteorological Sciences 

出 版 物：《Advances in Atmospheric Sciences》 (大气科学进展（英文版）)

年 卷 期：2015年第32卷第6期

页      面：821-830页

核心收录：

学科分类：07[理学] 070601[理学-气象学] 0706[理学-大气科学] 0816[工学-测绘科学与技术] 0825[工学-航空宇航科学与技术] 

基　　金：funded by the National Natural Science Foundation of China (Grant Nos. 41105031, 41230419, 91337213 and 41205126) the China Special Fund for Meteorological Research in the Public Interest (Grant Nos. GYHY201306017 and GYHY201306077) the Strategic Priority Research Program (Grant No. XDA05100303) the Major State Basic Research Development Program (Grant No. 2010CB428601) Environmental Public Welfare Scientific Research (Grant No. 201209006) 

主　　题：CloudSat deep convective clouds marine cyclones northern Pacific 

摘      要：Based on combined CloudSat/CALIPSO detections, the seasonal occurrence of deep convective clouds （DCCs） over the midlatitude North Pacific （NP） and cyclonic activity in winter were compared. In winter, DCCs are more frequent over the central NP, from approximately 30~N to 45~N, than over other regions. The high frequencies are roughly equal to those occurring in this region in summer. Most of these DCCs have cloud tops above a 12 km altitude, and the highest top is approximately 15 km. These wintertime marine DCCs commonly occur during surface circulation conditions of low pressure, high temperature, strong meridional wind, and high relative humidity. Further, the maximum probability of DCCs, according to the high correlation coefficient, was found in the region 10^-20~ east and 5^-10~ south of the center of the cyclones. The potential relationship between DCCs and cyclones regarding their relative locations and circulation conditions was also identified by a case study. Deep clouds were generated in the warm conveyor belt by strong updrafts from baroclinic flows. The updrafts intensified when latent heat was released during the adjustment of the cyclone circulation current. This indicates that the dynamics of cyclones are the primary energy source for DCCs over the NP in winter.