青藏高原地面热力异常对夏季江淮流域持续暴雨形成作用的数值试验

本文采用OSU-AGCM大气环流模式，对青藏高原下垫面热力异常与夏季江淮流域暴雨形成的关系进行了数值试验。模拟结果表明，青藏高原下垫面热力状况的异常对东亚环流形势及云量分布异常的影响是形成1991年夏季江淮流域持续性降水的重要原因之一。青藏高原异常热力强迫还可以引起大范围云量的异常分布和云量异常区类似于二维Rossby波列没大圆路径传播的特征。

A Numerical Experiment of the Effect of Anomalous Thermal Forcing of Tibetan Plateau Ground Surface on the Formation of Persistent Heavy Rain in Summer over the Yangtze-Huaihe Basin

Based on the atmospheric general circulation model (OSU-AGCM), the relationship between theanomalous thermal forcing of the Tibetan Plateau ground surface and formation of bevy rain in theYangtzd-Huaihe basin is studied by the numerical experiments described in this paper. The results showthat the effect of the anomalous thermal regime of the Tibetan Plateau ground surface on general lation in East Asia and anomalous distribution of cloud amount is one of important reasons of Persistent rainfall in the Yangtze-Huaihe basin during the summer of 1991 similar to the character of the dimension Rossby wave along great circle route, anomalous thermal foring of the Tibetan Plateau can result in distribution of anomalous cloud amount.