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題名 | 利用雙都普勒雷達資料分析颮線對流之動能收支 |
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作者 | 林松錦; 黃素珍; | 書刊名 | 大氣科學 |
卷期 | 18:1 1990.03[民79.03] |
頁次 | 頁21-34 |
分類號 | 328.885 |
關鍵詞 | 動能收支; 對流; 雙都普勒雷達; 颮線; |
語文 | 中文(Chinese) |
中文摘要 | 本文針對民國76年5月16、17日在臺灣海峽附近發生的一個颮線系統進行動能收支的診斷研究。此系統由於發生在TAMEX期間,有較完整的都普勒雷達觀測資料,故利用雙都普勒雷達在17日0042LST和0045LST兩次的觀測推得三維風場,並由熱動力反求法求得壓力和溫度的擾動偏差量。利用這些資料,系統的動能分析得以進行。 動能收支的結果顯示,在整個空氣柱中,強烈的上升運動使總動能往上輸送。水平與垂直通量輻散是動能的源,在各高度上其數量大小相近,但作用相反。總浮力作用是動能最主要的匯,由於多數的暖空氣下降、冷空氣抬升,使系統中有極大部分的動能轉換成位能。摩擦消散項僅是動能的次要匯。由動能的局部變化率顯示,分析區域上層動能的增生不夠抵償中、下層動能的消耗,顯示系統已在逐漸消散中。 |
英文摘要 | This paper conducts a kinetic energy analysis for a squall line which occurred in the Taiwan Strait on 16-17 May 1987. Since this convective system was observed during TAMEX, detailed 3-dimensional wind fields can be obtained from dual-Doppler radar observations and deviations of pressure and temperature perturbations can further be derived by thermodynamic retrieval method. By using these kinematic and thermodynamic fields obtained from two successive radar volume scans taken at 0042 LST and 0045 LST 17 May, kinetic energy analysis for a squall line becomes possible. The results of kinetic energy analysis reveal that, in the entire column of air within the convective system, strong upward motions transport kinetic energy from the lower levels to the upper levels. Horizontal and vertical flux divergences of kinetic energy are both sources to the total kinetic energy of the system, their magnitudes are similar but of opposite signs at all levels. Total buoyancy effect is the major sink of the system's total kinetic energy, this is due to rising of cold air and sinking of warm air which convert kinetic energy into potential energy. Frictional dissipitation is a minor sink to the total kinetic energy. Large value of local rate of change of total kinetic energy indicates that kinetic energy gain in the upper levels is not large enough to compensate the loss in the lower levels, which suggests that the convective system is decaying. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。