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題名:AVHRR及ATSR亮度溫度測量的綜合比較     (56點)
A Comprehensive Comparison between AVHRR and ATSR Brightness Temperature Measurements
著者:吳宜昭(Yi-Chao Wu)
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:AVHRR ; ATSR ; 亮度溫度差異 ; AVHRR ; ATSR ; Brightness temperature discrepancy
刊名:大氣科學
卷期:29卷3期(2001.9)
頁碼:229-256
語言:繁體中文
摘要: 中文摘要PDF ; 英文摘要PDF

為檢視AVHRR及ATSR亮度溫度測量的一致性及差異性,本研究取校準過且經地理定位的AVHRR及ATSR紅外亮度溫度資料進行比較,選用的資料包括兩區域之資料,一為1991年10~11月於西地中海與英吉利海峽(地中海組)的測量,一為1992年5~9月於美國東南部與海岸附近(美國組)的測量。比較結果顯示,不分測量地域、季節,AVHRR及ATSR的亮度溫度均有不小的差異。AVHRR及ATSR亮度溫度差異的量值隨比較組的不同差別相當大,第四頻道亮度溫度差異的範圍為-0.834K~2.597K,第五頻道亮度溫度差異的範圍為-1.617K~2.746K,而AVHRR亮度溫度普遍較ATSR亮度溫度高,有的比較組差異高達2.75K。綜合而言,第四頻道亮度溫度差異平均值及其加減標準差為0.593K±0.755K,第五頻道為0.623K±0.847K。本研究並探討亮度溫度差異的可能來源。考慮的因素包括大氣及海洋環境的變化、測量當時狀況諸因素(測量天頂角、第四及第五頻道亮度溫度差距、影像亮度溫度的平均值及標準差)、雲污染的可能、地理定位誤差、飛行校準系統性能、檢測計噪聲及資料數位化誤差等。 本研究對AVHRR及ATSR紅外亮度溫度詳盡的綜合比較,顯示兩者的差異不小,且造成差異的原因相當多元。欲結合兩種資料以進行需要長期、精確海溫資料的短期氣候研究時,須特別考慮此因素。
To investigate the consistency between Advanced Very High Resolution Radiometer (AVHRR) and Along Track Scanning Radiometer(ATSR) measurements, the calibrated and geolocated AVHRR and ATSR infrared brightness temperature measurements are compared. The first data set consists of measurements taken from October to November in 1991 in the western Mediterranean Sea and English Channel(Mediterranean Sea data).The second one contains measurements taken from May to September in 1992 in the east and south of USA and its vicinity (USA data). The comparison shows that regardless of measurement location or season, there exist significant discrepancies between AVHRR and ATSR brightness temperature measurements. The magnitude of discrepancy varies with different comparison sets. The discrepancies range from -0.834K to 2.597K for channel 4 and -1.617K to 2.746K for channel 5, respectively. It is found that AVHRR brightness temperature is generally higher than that of ATSR, and channel brightness temperature discrepancies could be up to 2.75K. Over all, the mean and the standard deviation of these discrepancies are 0.593K±0.755K for channel 4 and 0.623K±0.847K for channel 5.Attempts have been made to find out the possible sources of brightness temperature discrepancies. Factors considered include atmospheric or oceanic environmental changes, the measurement conditions (image zenith angle, the difference between channels 4 and 5 brightness temperatures, and the mean and standard deviation of scene temperature), cloud contamination, image co-registration error, in-flight calibration system performance, the detector noise, and data digitization. These detailed and comprehensive comparisons between AVHRR and ATSR brightness temperature measurements show significant inconsistency, which are attributed not only to a single cause but various factors. Caution is urged when AVHRR and ATSR measurements are incorporated for climate applications that require long SST fields with high accurac


    

本卷期目次
大氣科學 29卷3期 (2001.9)
臺灣北部和南部氣壓日變化之分析研究/ 蒲金標
梅雨季伴隨華南西南風爆發之低壓發展/ 侯喜真陳泰然
AVHRR及ATSR亮度溫度測量的綜合比較/ 吳宜昭
1975/76年氣候突變對西北太平洋熱帶氣旋生成的影響/ 林和吳宜昭
中央氣象局數值預報模式降水預測校驗:1999與2000年/ 潘琦盧孟明
 
   
 
   

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