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一、引 言 我们对戈达德大气试验室四阶大气环流模式用2°纬度乘2.5°经度的描述,体会到在使用高的水平分辨率能加强模式在北半球展现的西风偏倚倾向这点上,与其它模式的一批方案如英国(U.K.)气象局(Palmer等,1986)的方案是相似的。可能由于这种偏倚的关系(这种偏倚在典型的高分辨数值预报5—10天后变得明显),4°×5°的预报比2°×2.5°的预报在进入7—8天的预报后更趋向于变得成熟。 帕尔门(Palmer)等人(1986)指出,美国气象局模式中关于用次网格尺度地形性发生的重力波来对平均风曳力进行初始化方案的内容,在上述模式的高分辨方案中可以减弱西风的偏倚。因此,我们开始研究戈达德大气试验室四阶模式中重力波曳力的参数化效应。
I. INTRODUCTION We described the fourth-order atmospheric circulation model in the Goddard Atmospheric Laboratory at a latitude of 2 ° and a longitude of 2.5 °. It is realized that the use of high horizontal resolution can enhance the tendency of the westerly bias in the northern hemisphere, It is similar to the schemes in other modes such as the UK Bureau of Meteorology (Palmer et al., 1986). Probably due to this bias (this bias becomes evident 5-10 days after typical high-resolution numerical predictions), forecasts of 4 ° × 5 ° are more predictive than those of 2 ° × 2.5 ° at 7-8 days of forecast After more tend to become mature. Palmer et al. (1986) pointed out that the content of the initial wind-shear force for gravity waves generated by sub-grid-scale topography in the US Meteorological Administration model in the high-resolution scheme of the above model Can weaken the westerly bias. Therefore, we began to study the parametric effect of gravity wave drag in the fourth-order mode of the Goddard atmospheric laboratory.