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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/35931

    Title: 氣象輸入資料對光化學空氣品質模式計算結果的影響
    Other Titles: The effects of meteorological input data on the results of a photochemical air quality model
    Authors: 張佩琳;Chang, Pei-lin
    Contributors: 淡江大學水資源及環境工程學系碩士班
    江旭程;Chiang, Hsu-cherng
    Keywords: 海水面溫度;地形處理;四維資料同化;光化學污染;Topography;Sea surface temperature;four-dimensional data assimilation;Photochemical model
    Date: 2005
    Issue Date: 2010-01-11 07:21:23 (UTC+8)
    Abstract: 氣象狀況是空氣品質模式重要的輸入資料,台灣為一個山岳陡峭的海島,台灣的氣流受到地形和地面參數(如海水表面溫度、地面粗糙度等)影響極大,但許多氣象模式所需輸入的資料不容易取得準確的值,因此值得探討改變氣象模式輸入資料和演算法,對空氣品質模擬結果的影響。
    It is well known that meteorological conditions are important input data for air quality models. Since Taiwan is an island with steep mountains, the air flows in Taiwan are significantly affected by local topography as well as surface parameters such as sea surface temperature and roughness. In general, it is a difficult task to collect accurate input data for a meteorological model. Hence, it is worth to investigate the effects of input data and computation algorithm of a meteorological model on the simulation results of a photochemical air quality model.
    The mesoscale meteorological model, RAMS, and photochemical air quality model, CAMx, was used in this study. Several runs were carried out by varying the parameters that control four-dimensional data assimilation (FDDA), topographic initialization methods, and sea surface temperature data. The effects of these modifications on the results of simulated meteorological fields, including the distributions of wind, temperature, and humidity, were studied. Then, the simulated meteorological fields were used as input of CAMx. Model. The performances of the CAMx model were evaluated by comparing the results with observations.
    The RAMS model employs Newtonian relaxation method for FDDA. While the analysis nudging is used, the nudging term will be controlled by a time scale parameter. Too strong nudging should be avoided, otherwise some circulations, such as land-sea breezes, mountain-valley winds, and topography effects will be diminished. For topographic initialization, the results obtained by the reflected envelop topography scheme are superior to that obtained by the conventional averaging approach. Two sea surface temperature data set were used, i.e., climatologically data and optimal interpolated real time data. The results of air quality simulation obtained by using two dataset are similar.
    Appears in Collections:[水資源及環境工程學系暨研究所] 學位論文

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