Seasonal variability in tropical and subtropical convective and stratiform precipitation of the East Asian monsoon  

作　　者：HU Liang LI YaoDong SONG Yang DENG DiFei 

机构地区：[1]National Satellite Meteorological Center, China Meteorological Administration, Beijing 100081, China [2]Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China [3]Beijing Aviation Meteorological Institute, Beijing 100085, China [4]L M. Systems Group, Satellite Meteorology and Climatology Division, National Oceanic andAtmospheric Administration, Washington D C, USA

出　　处：《Science China Earth Sciences》2011年第10期1595-1603,共9页中国科学（地球科学英文版）

基　　金：supported by National Natural Science Foundation of China (Grant No. 40428002);Scientific Research on Public Causes of China (Grant No. 2004 CB418303)

摘　　要：Seasonal variations in tropical and subtropical convective and stratiform precipitation of the East Asian monsoon are analyzed using 10-year (1998-2007) Tropical Rainfall Measuring Mission (TRMM) precipitation radar (PR) rain products (2A25). Datasets from the Intergovernmental Panel on Climate Change Fourth Assessment Report (AR4) 24 general circulation models (GCMs) are evaluated using TRMM PR rain products in terms of their ability to simulate convective and stratiform precipitation and their deficiencies. The results show that Asian monsoon convective and stratiform precipitation increases significantly after onset of the summer monsoon, but the percentage of convective precipitation clearly decreases over tropical areas while it increases in subtropical regions. The GCMs simulate well the seasonal variation in the contribution of Asian monsoon subtropical convective precipitation to the total rainfall; however, the simulated convective precipitation amount is high while the simulated stratiform precipitation amount is low relative to TRMM measurements, especially over the Asian monsoon tropical region. There is simultaneous TRMM-observed convective and stratiform precipitation in space and time, but GCMs cannot simulate this relationship between convective and stratiform precipitation, resulting in the deficiency of stratiform precipitation simulations.Seasonal variations in tropical and subtropical convective and stratiform precipitation of the East Asian monsoon are analyzed using 10-year （1998-2007） Tropical Rainfall Measuring Mission （TRMM） precipitation radar （PR） rain products （2A25）. Datasets from the Intergovernmental Panel on Climate Change Fourth Assessment Report （AR4） 24 general circulation models （GCMs） are evaluated using TRMM PR rain products in terms of their ability to simulate convective and stratiform precipitation and their deficiencies. The results show that Asian monsoon convective and stratiform precipitation increases significantly after onset of the summer monsoon, but the percentage of convective precipitation clearly decreases over tropical areas while it increases in subtropical regions. The GCMs simulate well the seasonal variation in the contribution of Asian monsoon subtropical convective precipitation to the total rainfall; however, the simulated convective precipitation amount is high while the simulated stratiform precipitation amount is low relative to TRMM measurements, especially over the Asian monsoon tropical region. There is simultaneous TRMM-observed convective and stratiform precipitation in space and time, but GCMs cannot simulate this relationship between convective and stratiform precipitation, resulting in the deficiency of stratiform precipitation simulations.

关 键 词：convective precipitation stratiform precipitation Asian monsoon seasonal variability 

分 类 号：P457.6[天文地球—大气科学及气象学] P48