IAP T42L9全球谱模式加热场的诊断

The Diagnosis of Diabatic Heating Produced by the IAP T42 L9 Global Spectral Model

就一次出梅时副高北进过程，对ＩＡＰＴ４２Ｌ９全球谱模式加热场与利用ＥＣＭＷＦ同化系统资料根据热力学方程反算的加热场进行了比较。结果表明：模式参数化加热场的水平分布基本合理，但低纬和南半球中高纬地区加热偏弱；参数化加热的垂直分布在北半球比较合理，但在南半球与反算法的结果有较大差别。这些结果对模式能很好地预报北半球中高纬环流形势演变，较好地预报西太平洋副高变化及预报的副高系统性偏弱给出了较好的解释。

As far as one synoptic process is concerned;; during which the subtropical high over thewestern Pacific shifted to northwest and Meiyu at the Yangtze River valley terminated;; the diabatic heatparameterized by the model of IAP T42L9 is conipared with that derived from assimilated data bymeans of the ' budget' method. It is concluded that the horizonal distribution of the diabatic heat of themodel is substantially reasonable;; but the heat is smaller than that from ' budget ' method in the tropicalarea and middle and high latitude areas in the Southern Hemisphere. And the vertical distribution of theheat in the Northern Hemisphere is also reasonable;; but there exists difference between the two kinds ofheat in the Southern Hemisphere. These results give an propor explanation that the model can predictvariatinn of synpotic system at middle and high latitudes in the Northern Hemisphere and thesubtropical high over western Pacific;; and that the subtropical high predicated by the model is lowerthan that in the real data.