【摘要】 用1945～1993年的COADS SST强迫AGCM进行了连续49年的模拟积分,分析了模式大气中的年代际变化,并和NCEP再分析资料进行了比较。结果表明,模式大气中,无论是热带太平洋风场,还是中、高纬大气环流均存在显著的年代际变化;AGCM基本上能较好地模拟热带太平洋和中、高纬大气环流年代际信号的空间分布和时间变化趋势;从时间变化上看,热带太平洋风场的模拟结果要好于中、高纬大气,说明SST仍然是影响热带大气环流年代际变化的主要因子,其对热带大气环流的影响要比对中、高纬大气环流的影响显著。然而,模拟和观测之间仍存在明显的差距,这一方面归因于大气模式本身的性能,同时也说明影响大气环流年代际变化的因子不只是SST异常,要成功模拟大气环流(尤其是中、高纬)的年代际变化,仅仅考虑SST的变化尚不够,必须综合考虑各种因子的作用。更多还原

【Abstract】 By using the simulation results of an AGCM, which had been run from 1945 to 1993 forced by COADS SST, the interdecadal variability of the model atmosphere was investigated and compared with that of NCEP reanalysis data. It was found that, interdecadal variability exists significantly in both the tropical Pacific wind fields and the mid-high latitude atmospheric circulation of the model atmosphere. The tendency of time variation and spatial distributions of the interdecadal variability of the model atmosphere are basically consistent with observation. Relative to the mid-high latitude atmospheric circulation, the simulation of tropical Pacific wind is more satisfying, which suggests that anomalous variation of SST is still the main factor for the interdecadal variability of tropical Pacific wind. It might has more significant influence on the tropical wind than on the mid-high latitude atmosphere. However, there is still obvious difference between the simulation and observation. They could be attributed to both the simulation capability of the model and absence of other factors in the model which are important for the interdecadal climate variation.更多还原