查詢結果分析
來源資料
頁籤選單縮合
題 名 | 臺灣北部與鄰近地區春夏季節中尺度對流系統發展的環境條件探討=An Investigation of Environmental Conditions of the Mesoscale Convective Systems Over Northern Taiwan and its Vicinities in the Spring-Summer Period |
---|---|
作 者 | 林宗嵩; 陳泰然; | 書刊名 | 大氣科學 |
卷 期 | 25:3 1997.09[民86.09] |
頁 次 | 頁379-396 |
分類號 | 328.291 |
關鍵詞 | 中尺度對流系統; 垂直風切; 對流可用位能; 對流理查遜數; 穩度指數; 線狀對流; 非線狀對流; Mesoscale convective system; Vertical wind shcar; CAPE; Ric; Instabitity index; Line-type convection; Non-line type convection; |
語 文 | 中文(Chinese) |
中文摘要 | 本文利用 1988 ∼ 1993 年 2 ∼ 7 月民航局中正機場都卜勒雷達回波資料與中 央氣象局板橋探空站資料,以探討不同生命階段之線狀與非線狀中尺度對流系統以及不同類 別線狀對流之環境條件特徵與其間異同。所分析之相關環境條件參數包括:垂直平均風場、 垂直風切、穩度指數、各種特徵高度(層)、對流可用位能( CAPE )以及對流理查遜數( Ric )等。 結果顯示,低層垂直風切之大小可能為決定中尺度對流系統是否形成線狀結構、線狀對流形 成型態是否為後造型以及線狀對流主軸是否為東西走向之重要因子。總指數與 CAPE 有最佳 之正相關且常可表達線狀對流系統內對流之垂直發展深淺, 而 Weisman and Klemp 區分不 同胞狀結構颮線系統之 Ric 值標準,可能並不適用於副熱帶之春夏季節。 此外發現,環境 之不穩度與 CAPE,線狀對流較非線狀對流為大,過境前較過境時與過境後為大, 鋒前型較 鋒上型為大, 系統與鋒面相交者較平行者為大,破線型較後造型為大,主軸呈東北 - 西南 與南北走向者較東西走向者為大,後側型較主軸型為大。 |
英文摘要 | Doppler radar echoes at the CKS International Airport of the Givil Aeronautics Administration and rawinsonde data at Panchiao station of the Central Weather Bureau in the period of February-July 1988-1993 were analyzed. The environmental conditions were studied for the different life stages of line type and non-line type mesoscale convective systems (MCSs) as well as various types of line convection. Pertinent parameters representing environmental conditions include vertically weighted mean wind, vertical wind shear, instability indices, characteristic levels, CAPE and Ric. Results showed that vertical wind shear seems to be instrumental in determining the mesoscale organizing structure of line type vs. non-line type, the line formation of back building type vs. broken areal type, and line axis orientation of E-W type vs. NE-SW and N-S types. Total totals index and CAPE are highly correlated and are good indicators for the vertical development of the convection in line-type MCSs. The criteria of Ric in distinguishing the cell structure of squall line as proposed by Weisman and Klemp appear to be inappropriate over the subtropical region in the spring-summer period. Additionally, it was found that significant differences in instability and CAPE existed among various types of MCSs. The instability and CAPE are greater for the line type than the non-line type convection and greater for the pre-system than the after-system environment. For the line-type convection, they are greater for the pre-frontal type than the over-frontal type, greater for the non-parallel type than the parallel type, greater for the broken areal type than the back building type, greater for the NE-SW and N-S types than the E-W type, and greater for the rear-type than the along-axis type. |
本系統中英文摘要資訊取自各篇刊載內容。