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題名:同時物理反演法在TAMEX期間反演結果之分析     (36點)
Applying Satellite Data to Retrieve Atmospheric Vertical Profiles During TAMEX Period
著者:劉振榮(Gin-Rong Liu) ;陳萬金(Wann-Jin Chen)
出版地區:台灣
出版城市:台北市
學科:天文學 ; 地球科學
關鍵字:反演法 ; 衛星遙測 ; Retrieval Method ; TAMEX ; Satellite Remote Sensing
刊名:大氣科學
卷期:20卷2期(1992.6)
頁碼:135-152
語言:繁體中文
摘要: 中文摘要PDF ; 英文摘要PDF

本研究修改CIMSS反演大氣垂直溫濕剖面的程式套,而以TAMEX期間台灣地區接收到的NOAA衛星TOVS輻射觀測資料進行大氣垂直溫濕剖面反演,探討不同雲量的反演區之反演結果與探空資料相比較之差別及TAMEX期間衛星資料反演結果的統計特徵。研究過程中發現,TOVS微波頻道MSU無法穩定使用於模式中,且初始猜測垂直剖面影響到反演的結果極大。本研究結果顯示台灣地區反演大氣垂直剖面最佳的頻道組合?僅用HIRS/2紅外頻道輻射值及採用氣候值之初始猜測垂直剖面。 本研究結果亦顯示,不論何種天氣現象,反演區雲量和結果之準確度有明顯的關係。平常時期,溫度垂直均方根差異皆在3K左右,重力位高度在80公尺左右;但是TAMEX的時期則是溫度垂直均方根差異在150-500mb之間高達4-6.5K,其餘各層在3.5K以內;重力位高度垂直均方根差異在100-300mb之間達100-160公尺,其餘各層在80公尺以內。顯然不同的天氣現象有不同的反演結果,一般的天氣現象比特殊的天氣現象有較好的反演結果。 另外,在不同雲量反演結果的比較上,平常時期,雲量在<20%,20%-50%和50%-100%時,溫度均方根差異分別?2.5,3.0和4.0K,而重力位高度均方根差與分別?55,85和106公尺。顯然反演的準確度在溫度及重力位方面有隨雲量增加而變差的趨勢。在水汽方面,則因其具時間及空間上強烈的變異性,因此難以掌握其隨雲量變化的關係。TAMEX期間,結果大致和平常時期一致,但因多?雲區,所以結果隨雲量的變化上較不明顯。
The package for retrieving temperature and moisture profiles from TOVS radiance observations developed by CIMSS was modified. The TOVS radiance data observed during TAMEX period were used in the modified package to diagnose the retrieval results. The satellite retrievals in different cloud cover area were compared with radiosonde observations to investigate the statistical characteristics during TAMEX period. In the comparisons, it was found that the microwave sounding unit (MSU) of TOVS could not confirmably used in the retrieval algorithm. And the first guess of the sounding for the algorithm greatly influenced the accuracy of the final results. It is suggested that in order to get reasonable retrieval accuracy, the optimal combination of retrieval channels is just using HIRS channels and the best first guess is the climatological profiles. It was also found in this study that under any weather condition, the accuracies of retrievals are strongly related with the cloud amounts of the retrieval area. In general, the RMSD of retrieval temperature and geopotential height are about 3 k and 80 m, respectively. But during TAMEX period, the RMSD of temperature and geopotential height are about 4 k and 100 m, respectively. The relatively large RMSD of temperature occurs between 150 mb and 500 mb where 4-6.5 k RMSD were found. The relatively large RMSD of geopotential height occurs between 100 mb and 300 mb where 100-160 m RMSD were found. Therefore, it is evident that the accuracies of retrievals strongly depend on weather conditions. In this study, the retrieval accuracies of various cloud amount during ordinary time are about 2.5, 3.0, and 4.0 k in the temperature and about 55, 85, and 106 m in the geopotential height for cloud amount <20%, 20%-50%, and 50%-100%, respectively. It is clearly that the retrieval accuracies decrease with the increase of cloud amounts. Because its variability in time and space, there can not find the correlation between the cloud amount and the retrieval accuracy for water vapor. During TAMEX period, there have the similar conclusions with those during the ordinary time, because the retrieval areas are usually covered by large cloud amount, it is difficult to clearly find out the correlation of cloud amount and the retrieval accuracy.


    

本卷期目次
大氣科學 20卷2期 (1992.6)
一維垂直光化模式之研究與應用/ 柳中明
同時物理反演法在TAMEX期間反演結果之分析/ 劉振榮陳萬金
北半球阻塞高壓的特徵及生成/ 鄒治華林燕枝郭勉之
ENSO和Post-ENSO大氣波動之正模結構/ 李汴軍
1990年六月九日北部地區豪雨個案的綜觀環境及降水分析/ 鄧財文陳景森陳台琦
 
   
 
   

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