摘要
本文通过对历史(1979—1987年)资料的统计分析,说明山东半岛地形对风场的转向作用在强风、强温度平流情况下是显著的,并在分析Daoard一层中尺度风场诊断模式在强背景场下不能适用的原因基础上,应用尺度分离方法,改进了原模式。通过对实际天气过程的计算表明,改进以后的模式能较好地反映半岛地形对风场的影响,从而说明改进后模式的有效性。
A one-level, meso-scale diagnosing wind model based on primitive equations designed by Danard can show the characteristics of surface winds in mountainous and coastal regions. But the model results largely depend on large-scale background. In weak large-scale background (little wind, little temperature advection), the model works well. In strong background (often appears in cold surge), the model often runs into computational instability. The analysis of observational wind data (1979-1987) from Longkou and Yantai meteorological stations, which are located at the northwestern and northeastern coast of Shandong Peninsula, shows that the topography has also marked effects on wind field during cold surge. This paper is to prove that Danard model cannot be used in the latter case if not being improved. The model is improved by expressing the variables in two parts, one is background field which is known and the other is meso-scale field produced only by topographic disturbance, and a new model equations for meso-scale variables are obtained by using scale-splitting method. Application of the new model to several weather processes shows that the improvement to the original Danard model is successful.
出处
《海洋与湖沼》
CAS
CSCD
北大核心
1991年第5期474-479,共6页
Oceanologia Et Limnologia Sinica
