赤道东太平洋不同持续时间的海温正异常对东亚夏季气候影响的数值模拟研究

利用IAP两层大气环流模式及9层大气环流谱模式，模拟研究了大气对不同持续时间的赤道东太平洋正SSTA的响应。对积分结果进行分析发现，尽管SSTA的持续时间不同（分别为1月；1～2月及1～4月），但其引起的东亚夏季大气环流和气候异常的分布却都十分相似，而且有十分相近的时间演变形式。因此，虽然赤道东太平洋SSTA作为一种外源强迫对东亚夏季大气环流和气候有着明显的影响，但是这种影响对于SSTA的持续时间（1个月或4个月）并不敏感，这在一定意义上意味着，如果利用模式进行短期气候预测，要更多的注意SSTA的发生（出

A Numerical Study of the Summer Climatic Response in East Asia to Positive SSTA with Different Duration in Equatorial Eastern Pacific

The atmospheric responses to positive SSTA with different durations in the eastern equa-torial Pacific are studied by using IAP-2-level AGCM and 9-level spectrum AGCM. The analyses ofsimulated results show that the excited anomalies of atmospheric circulation and climate in East Asia insummer are quite similar evens though positive SSTA in the eastern equatorial Pacific is kept for differ-ent duration (in January;; in January-February and in January-April;; respoctively);; and the excitedanomalies also resemble each other in the temporal evolution. Therefore;; as an external forcing;; theSSTA in the eastern equatorial Pacific will evidently impact the variations of atmospheric circulationand climate in East Asia;; but this influence is not sensitive to the duration of SSTA. In a sense;; it isshown that the occurrence and intensity of SSTA should be given more attentions to when we predictshort-range climate variation with the GCM.