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題 名 | 鋒面附近橫向環流的數值實驗 |
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作 者 | 江火明; 鄭華能; | 書刊名 | 大氣科學 |
卷 期 | 18:1 1990.03[民79.03] |
頁 次 | 頁57-72 |
分類號 | 328.24 |
關鍵詞 | 數值實驗; 鋒面; 橫向; 環流; |
語 文 | 中文(Chinese) |
中文摘要 | 鋒面附近的橫向環流對於天氣系統的變化有著密切的關係,為了瞭解橫向環流演變的過程,本文利用二維原始方程數值模式,假設地形平坦、無水汽,考慮亂流擴散作用,設定一個理想的成熟鋒面為初始狀況,在暖區有一個完整的熱力間接環流,模擬探討橫向環流的演變過程。 積分結果顯示,橫向環流系統的生命史約5小時左右,它的演變過程主要受到地轉偏差剩餘的強迫作用,地轉偏差剩餘量的變化週期為慣性振盪週期,水平渦度受地轉偏差剩餘的導引而隨時間變化,其變化型式幾乎與地轉偏差剩餘的型式一樣,但超前1/4慣性振盪週期。 |
英文摘要 | There is very closed relationship between the evolution of weather systems and the transverse circulation in the vicinity of front. In order to understand the evolution process of the transverse circulation, a simple two-dimensional numerical model without any topography was employed in this study. The eddy diffusion effect in the boundary layer was taken into consideration. A mutual cold front with a complete thermally indirect circulation in the warm sector was specified as the initial situation and then the numerical integration was done for 24 hours. The results indicated that the life of the transverse circulation was about 5 hours and its evolution process was forced by the ageostrophic residue. The horizontal vorticity was induced by the ageostrophic residue but with a time lag about 1/4 inertia oscillation period. |
本系統中英文摘要資訊取自各篇刊載內容。