局域热源强迫和大尺度流型的长期演化

LOCAL THERMAL FORCING AND LONG-RANGE EVO- LUTION OF LARGE-SCALE FLOW PATTERN

积分时间达 7个模式月的 3组试验表明 :在一定的参数条件下 ,局域热源强迫的引进可以激发出大尺度流型的全局调整 ,即从一个两槽两脊的流型转换为一个一槽一脊的流型。局域热源的强度、范围和纬度位置 ,对大尺度流型长期演化特征 ,均具有重要影响。

Three experiments whose integration times are longer than seven model months are performed.Results show that in the certain parametric region,the local thermal forcing can creat the global transformation from the initial flow pattern characterized by two low troughs and two high ridges to the another flow pattern characterized by one low broad trough and one ridge,which has the stable property.The intensity,the extent,and the latitudial position of the local thermal forcing are the three factors affecting the long range evolution of large scale flow pattern.