NUMERICAL TEST OF AN EARLY-SUMMER EXPLOSIVE CYCLONE EVENT IN EAST ASIA

作     者：杨福全 Isamu YAGAI 

作者机构：Department of Atmospheric Science.Training Center of the China Meteorological Administration.Beijing 100081.China. NationalResearch Institute for Earth Science and Disaster Prevention.Science and Technology Agency.Japan.305-0006 

出 版 物：《Acta meteorologica Sinica》 (Acta Meteorologica Sinica)

年 卷 期：2000年第14卷第3期

页      面：347-360页

学科分类：07[理学] 070601[理学-气象学] 0706[理学-大气科学] 

主　　题：explosive cyclone smoothing technique northern trough moisture transportation channel 

摘      要：A series of ten numerical tests are carried out using smoothing techniques in the PSU/NACR mesoscale model MM5 initial field in order to study the development reasons of a pre-summer uncommon explosive event which took place in East Asia from 1—2 *** integration fields are compared with that of original results obtained by non-smoothed initial *** results show that:(1)After the northern trough is smoothed,its corresponding cold air can not move downward and *** a weak cyclone system forms south of 25°N after 24 h integration. (2)After the southern strong moisture transportation channel is smoothed,the northem trough system can only form a weak trough along the east coast of China after 24 h integration.(3)These two separate low trough systems in the southern and northern jet systems,with strong warm moisture transportation channel and cold air respectively,are both necessary for explosive cyclone *** such an unfavorable season and location for explosive cyclone to take place,only after these two low troughs merged into a strong low vortex can the surface cyclone he developed *** the northern trough system and the southern moisture transportation channel are all indispensable for the explosive cyclone *** explosive cyclone event is the result of the interaction of northern and southern systems.