• 作者： 陳泰然
• 作者服務機構： 國立臺灣大學大氣科學系
• 中文摘要： 本文針對四個北美冬季氣旋生成發展的合成個案進行等(火商)分析。基於能量保守定律及氣塊運動的原則，並在絕熱及無摩擦作用的假定下，於等(火商)面上分析氣塊的軌跡線以暸解三度空間的空氣運動，並估計平均垂直速度。更籍此軌跡線以追綜主要地區空氣之來源及去處。 結果顯示在θ=3260K等(火商)面上的平均下降速度和解連續方程所得的瞬時下降速度大小相當。但在低壓區則前者僅後者之半，主要係由於絕熱假定所致。低壓生成發展之動能來源由軌跡線顯示，除由該區之可用位能轉換之外，上游西北氣流斜壓區內已存的大量動能的輸入亦佔相當重要的份量。
• 英文摘要： Based on the conservation of total energy and the kinematic constraintof a moving air parcel, the isentropic analysis was carried out for a com-posite case of the cyclogenesis in winter season. Some representativetrajectories are presented to show the mean vertical motion field and totrace the origin and destination of pertinent air parcels. The averagedvertical velocities are compared to the instantaneous one's computed kine-matically and to the radar reports. Results suggested that a pre-existing source of kinetic energy in theupstream baroclinic zone provided part of the storm energy. The genera-tion of kinetic energy through a conversion process within the storm regionwas also suggested as the air accelerated northeastward from both tropicaland mid-latitude origins.
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