RegCM3.0与RegCM4.0对中国区域多雨年夏季气候模拟的对比分析

采用RegCM3.0和RegCM4.0模式,利用NCEP/DOE Reanalysis II数据、NOAA的周平均海温资料以及BATS、CLM3.5两种陆面过程方案,对我国4个典型多雨年(1998、2003、2007、2010年)的夏季气候进行模拟试验。结果表明,RegCM4-BATS1e模拟的降水量和雨带位置都与观测事实更为接近,尤其是对东南沿海地区强降水带的模拟,模式两个版本对湿润区的降水模拟均偏少,对干旱半干旱、湿润半湿润区的降水模拟则偏多;对于气温的模拟,其模拟结果均存在负偏差,但都能够模拟出位于东南沿海及新疆沙漠地带的温度高值区,RegCM4-CLM3.5模拟温度的量值更准确,而RegCM4-BATS1e模拟的温度空间分布型态与实际最为接近。

Comparative Analysis Between the Simulated Regional Climates in China Rainy Summer by RegCM3.0 and RegCM4.0

By using NCEP/DOE reanalysis II data,NOAA weekly sea temperature data,and the different land surface processes from BATS and CLM3.5,the RegCM3.0 and RegCM4.0 models are emplyed to simulate the summer climates of four typical rainy years（1998,2003,2007,2010）. Results show that the precipitation amounts and rain belts simulated by the RegCM4-BATS1 e are very close with those from observation. The simulated precipitations in humid region by the two models are less than the actual ones,especially for the heavy precipitation belts along the southeast coast;and the simulated precipitations in semi-arid and semi-humid areas by the two models are more than the actual ones. For temperature simulation,although there are minus bias,all the models can simulate the high value zones which are located along the southeast coast and the desert region in Xinjiang. The average summer temperature distribution pattern simulated by RegCM4-BATS1 e is close to the actual one,and the vaules of temperature simulated by RegCM4-CLM3.5 are more accurate.