EPA-95-L102-02-101

096

1,600 千元

2007/01/01

2007/12/31

柳中明

監資處

尤思喻

國立臺灣大學全球變遷研究中心

環境資訊系統

紫外線指數,校驗系統,監測與預報

UVI,calibration,forecasting

譚俊傑

02-33664475ext 151

jjtarn@gcrc.ntu.edu.tw

本計畫為二年期計畫(執行期間：2006/03/14~2007/12/31)，本年度為第二年計畫。本計畫以提高國內紫外線預報與監測之正確性為主要目標任務，主要工作分兩部份：(1)維持紫外線預報系統運作正常並進行預報與監測分析；(2)進行紫外線輻射計校驗並維護紫外線校驗實驗室品保系統。 有關紫外線指數預報系統的維護與紫外線指數監測與預報結果的分析評估，大致均順利進行。監測資料有效率相當高，資料也漸趨平穩。午時輻射佔全日輻射量之比例，冬高夏低的特徵相當清楚，冬季約在72%，夏季約在62%。危險級與UVI≧8的出現機率明顯呈現冬低夏高的現象，且具區域差異與逐年變化特徵。幾個測站的UVA輻射量測值與同站的UVI測值，多具90%以上的相關性。午時UVA輻射佔全日輻射量之比例，冬高夏低的特徵清楚，季節性變動較UVI為小。在預報成效分析方面，預測誤差的上下變動幅度逐年漸次縮小，顯示整個預報系統的穩定性愈來愈佳。 為更增進紫外線指數之預報之成效；本計畫嘗試以數值模擬方式探討台灣地區近地面紅斑權重紫外線輻射通量的變化，將模擬成果與實際監測資料比較，期望日後能成為每日UVI預報作業中的參考數據。 二級與三級標準以及備品與測站之紫外線輻射計校驗均依紫外線校驗實驗室品保系統確實進行。

紫外線指數,校驗系統,監測與預報

EPA95L10202101_2.pdf

6MB

[期末報告]公開完整版

2008/3/1 上午 12:00:00

This project is executed between March 14, 2006 to December 31, 2007 and is in the second year phase. The main tasks are to enhance the reliability of UV-Index forecasting system and to operate and maintain the UV Instrument Calibration Laboratory (UVICL). The maintenance of the UVI forecasting system and the analysis of the UVI monitoring and forecasting results are running very smoothly. The effective monitoring rate is very high and the data has been smoothly collected. The percentage of noontime radiative flux taken up the whole-day radiation is about 72% in winter and 62% in summer. The occurring frequencies of extremely high UVI and UVI≧8 show a seasonal pattern of low value in winter and high value in summer, and vary significantly with region and year. In the meantime, monitoring of UVA and UVI shows a 90% positive correlation. The general characteristics of UVA are very similar to those of UVI. As far as the performance of UVI forecast system is concerned, the error has been minimized gradually, which suggests a stable UVI forecast system just as expected. In order to improve the performance of the UVI forecast system, a numerical simulation approach has been taken to simulate the hourly UVI. The results show some deviation does exist between the simulated and observed results, which should be corrected in the future. Hopefully, we may apply such numerical approach next year so as to enhance the performance of UVI forecast. As to the calibration of second and third standard monitoring instruments, things are running smoothly as expected.

UVI,calibration,forecasting