垂直低分辨率GCM模式大气平均经圈环流的诊断

DIAGNOSIS OF MEAN MERIDIONAL CIRCULATION OFTHE MODEL ATMOSPHERE IN THE GCM WITH LOW RESOLUTION VERTICALLY

以ＩＡＰ２－ＬＧＣＭ为例，给出垂直低分辨率ＧＣＭ模式大气平均经圈环流质量流函数的一个计算方案。结果表明，模式大气的Ｈａｄｌｅｙ环流季节变化与实际大气相一致。ＥｌＮｉｎｏ年模式大气平均经圈环流中可分离出一个与ＥｌＮｉｎｏ型ＳＳＴ异常关系密切的异常经圈环流，它导致平均Ｈａｄｌｅｙ环流向北半球盛夏型转变的滞后。

A scheme is proposed for calculating the streamfunction of the mass in meanmeridional circulation in the GCM of low resolution vertically. Results show that for the model Hadley circulation,its seasonal change is identical to that of the real atmosphere.It isfound that,separated from the mean meridional circulation of the model atmosphere in the ElNino year can be an anomalous circulation in close relation to the El Nin-type SST anomaly,which gives rise to the lagging transition of the average Hadley circulation into the northernmid summer type.