用全球大气环流模式嵌套区域气候模式模拟东亚现代气候

将区域气候模式RegCM2与中国科学院大气物理研究所的9层全球格点大气环流模式IAP AGCM单向嵌套，对东亚现代气候进行数值模拟研究，同时检验和分析该嵌套模式的性能.已完成的10年积分结果表明，单向嵌套RegCM2由于具有较高分辨率和较完善的物理过程，因此对地面气温和降水的空间分布形势和季节变化趋势都有较好的模拟能力，且较与之嵌套的IAP AGCM的模拟效果有较大改善，如在中国区域，它模拟的年均地面气温与实况的空间相关系数由全球环流模式的092提高到094，模拟的年均降水由05提高到07. 这与嵌套RegCM2能模拟出IAP AGCM所不能分辨的中尺度信号有很大关系.

Modern climate over East Asia simulated by a regional climate model nested in a global gridpoint general circulation model

A ten-year simulation of present climate over East Asia was conducted with the model RegCM2 which is nested in a gridpoint general circulation model (IAP-AGCM) developed by IAP/CAS (Institute of Atmospheric Physics, Chinese Academy of Sciences) in one-way mode, and model results are tested and analyzed. The result shows that the RegCM2 has a reasonable ability to simulate spatial distributions and seasonal cycles of surface air temperature and precipitation, due to its high resolution and perfect physics course. Compared with the IAP-AGCM, the RegCM2 achieves much improvement. The spatial correlation coefficient (SCC) of annual surface air temperature increases from 0.92 to 0.94 and SCC of annual precipitation increases from 0.5 to 0.7 over China, respectively. One of the reasons is that the nested RegCM2 can capture mesoscale signals caused by sub-GCM grid scale forcings, which exist in observations but not in the IAP-AGCM.