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題 名 | 微波降雨雷達觀測之初步分析與應用=Preliminary Analysis and Application of the Micro Rain Radar Observations |
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作 者 | 蔡嘉倫; 游政谷; | 書刊名 | 氣象預報與分析 |
卷 期 | 188 民95.09 |
頁 次 | 頁29-37 |
分類號 | 328.885 |
關鍵詞 | 微波降雨雷達; 雨滴粒徑分析; 三都卜勒雷達風場合成; Micro rain radar; Drop size distribution; Triple Doppler wind synthesis; |
語 文 | 中文(Chinese) |
中文摘要 | 微波降雨雷達(Micro Rain Radar)為國內首座垂直觀測(vertical pointing)之氣象都卜勒雷達,目前架設於中國文化大學大氣科學系觀測坪,主要設計為觀測大氣中的降水強度、雨滴落速、液態水含量、降雨率及雨滴粒徑分佈。此雷達擁有相當高之空間與時間的解析度,提供降水粒子在大氣中的分佈及變化。由於此雷達首次用來觀測副熱帶的降水系統,我們對於資料的準確度進行初步的分析;利用中央氣象局五分山雷達、民航局中正雷達與此微波降雨雷達之雷達回波資料進行比對。除此之外,利用文化大學觀測坪之雨量筒與撞擊式雨滴譜儀進行降雨率與粒徑分佈資料的相互驗證,藉此來評估微波降雨雷達在臺灣地區觀測之實用性。 在科學研究方面,此雷達所觀測到的雷達回波及雨滴落速,在移除雨滴的終端速度之後,可以獲得空氣的垂直速度,來檢視臺灣降水系統內部的結構特徵與其可能的對流過程;另外,使用此雷達所觀測的雨滴落速與五分山雷達、中正雷達之徑向風場可進行三都卜勒雷達風場合成,來獲得高解析度較接近真實三維風場的垂直分佈,此資訊對於了解風場的變化與對流系統演化相當有助益。在作業及預報方面,此雷達除了可清楚辨別融解層高度及其隨時間的變化之外,並可以提供降水粒子在垂直方向的快速演變情況,這些氣象資訊對於極短時的劇烈天氣預警相當有幫助。 |
英文摘要 | Micro Rain Radar (MRR) deployed at the campus of Chinese Culture University is the first vertical-pointing Doppler radar in Taiwan. It is designed to measure the precipitation intensity, rainfall velocity, liquid water content, rainfall rate and drop size distribution (DSD). This radar having high spatial and temporal resolution in the vertical provides detailed observations of precipitation distribution and variability in the atmosphere. Because this radar is the first time to be used to observe the precipitation systems occurring in subtropical regions, we carry on preliminary analysis and evaluation of the accuracy of the data. Comparisons between the MRR data and other independent radar measurements from the WFS and CKS radars are described in this paper. In addition, rain rate and DSD data obtained from the surface rain gauge and JWD disdrometer are also used to compare with those of the MRR, in an attempt to understand the feasibility of the MRR to study the subtropical precipitation systems. In scientific perspective, vertical air motions can be estimated from the MRR observed reflectivity and fall velocity as long as the contribution of terminal velocity of rain drops can be appropriately removed, which provide an opportunity to investigate the structures and convective processes of precipitation systems in Taiwan. With the reflectivities and radial velocities measured from the MRR and WFS and CKS radars, triple Doppler wind synthesis can be applied to retrieve the three-dimensional wind field, allowing to examine the variability of wind fields and evolution of convection systems. In operational and forecast application, the MRR can be used to observe not only the melting level and its variability but also the rapid evolution of elevated rain drops. Therefore, the information provided by the MRR is heloful to predict the occurrence of surface heavy rain and to give an early warning of these severe weather events. |
本系統中英文摘要資訊取自各篇刊載內容。