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利用美国国家大气研究中心 (NCAR)的全球大气模式 (CCM3) ,分别以月平均和周平均海表温度 (SST)为强迫场进行 2个积分试验 (称为 CCMM和 CCMW试验 )。积分结果与观测资料的对比分析发现 ,CCM3模拟大气季节内振荡 (MJO)信号的强度均较观测资料偏弱 ,而其中以CCMW模拟的强度略大而较接近真实。表明 SST强迫场包含更真实的季节内变化信息对提高模拟 MJO强度有作用。 CCMM与 CCMW模拟 MJO活动的时间位相均与观测差别较大 ,直接原因在于 CCM3中降水季节内振荡与 SST变化的相关关系不正确 ,而更根本的问题在于大气模式无法反映资料分析发现的季节内时间尺度的 SST与大气的相互作用。
Using NCAR’s Global Atmosphere Model (CCM3), two integral tests (called CCMM and CCMW tests) were conducted using the monthly mean and weekly mean sea surface temperature (SST) as the forced field. Comparing the integral results with the observed data, it is found that the intensity of the MJO signals simulated by the CCM3 is weaker than the observed data, and the strength of the CCMW simulated by the CCMW is slightly larger and closer to the real. It shows that SST forcing field contains more realistic information of intraseasonal changes has an effect on improving the intensity of simulated MJO. The direct correlation between the temporal phases of the CCM and CCMW simulated MJO activities is quite different from the observations. The direct reason is that the correlation between the intraseasonal precipitation and the SST in CCM3 is not correct. The more fundamental problem is that the atmospheric model can not reflect the seasons within the data analysis Time-scale interaction of SST with atmosphere.