• 作者： 鄧仁星; 陳景森
• 作者服務機構： 中央大學大氣物理研究所
• 中文摘要： 本篇介紹一在山區利用雙都普勒雷達資料求取風場的改進方法，此方法是建立在追隨地勢座標以便得到較合理的垂直速度下邊界條件。 經由我們利用此改進方法（方法A）所得的風場與模式結果及以往建立在直角座標的處理方法（方法B）所得的比較中，可知在平坦地區方法A與方法B或方法A與模式結果之間幾乎沒有差別。但在地勢起伏較大區域時，方法A所得的風場與地形之間有較好的配合關係，上升及下降速度區分別發生在氣流爬坡及下坡的地方。 希望經由本篇所介紹的改進方法，對於往後利用都普勒雷達資料探討山區雲雨系統的研究有所助益。
• 英文摘要： An alternative method to derive the wind field from dual-Doppler radar data in a mountainous area is given.This method is based on terrain-following coordinates in order to acquire more reasonable lower boundary conditionsfor the vertical velocity. First, we use dual-Doppler radar equations and the anelastic continuity equation as terrain-following coordinates to obtain the estimated wind direction and speed in three-dimensions. Then, we use thevariational method to adjust the wind field by the constraint of the continuity equation. After we compare the wind field obtained by this method (method A) with the model results and with thatobtained by using a similar method in a cartesian coordinate system with a zero vertical velocity lower boundarycondition (method B), we find that there is almost no difference between method A and B for flat terrain. However,fine structure associated with the terrain is found in method A. Ascending and descending motion occur to thewind-ward side and the lee side, respectively.
• 中文關鍵字： kinematic structure; squall line; terrain-following coordinates
• 英文關鍵字： --