【摘要】 本文采用一个低分辨率的准地转两层谱模式,考虑了实际的地形及加热场分布的强迫作用,对北半球冬季阻塞过程进行数值模拟。模拟结果较好地说明了大西洋及乌拉尔地区一次阻塞过程的具休特点。在此基础上又进行了一系列控制性试验,以探讨纬向不对称热力强迫及地形强迫在阻塞过程中各自所起的作用,以及强迫源强度对阻塞位置、强度、维持时间的制约作用。更多还原

【Abstract】 By using a two-level quasi--geostrophic spectral model in whichactual topography and diabatic heating are incorporated, blockingprocess in the northern hemisphere winter is numerically simulated.The results of the simulation account for the main features of ablocking process in the Atlantic and the Urals. Furthermore, a seriesof controlled experiments is carried out to reveal both the thermal andtopographic forcing in blocking processes, and the effects of theforcing intensity on the position, intensity and duration of theblocking highs.更多还原