| 摘要: | 本計畫進行微粒超級測站的品保查核及數據確認，各項查核的標準步驟及所需各項表格均已完成，並且已經進行了七次的每月定期查核，二次不定期查核，及半年定期校正工作查核，五次內部協商會議。從2003年1月份到10月份為止，超級測站各項自動監測儀器資料可用率為：PM10質量濃度98％，PM2.5質量濃度98%，PM2.5碳成分87%，PM2.5硝酸鹽濃度77%，PM2.5硫酸鹽濃度66%，PM2.5 PAH濃度75%，PM2.5黑碳濃度99%，微粒散光係數77%，次微米---微米氣膠粒徑分布95%，奈米---次微米氣膠粒徑分布90%。硫酸鹽連續監測儀有三個月的故障時間，硝酸鹽連續監測儀也有數值偏低的狀況。本年度執行30次以上的黃沙時期及非黃沙時期人工採樣，並進行各微粒成份比對，PM2.5質量濃度比對結果相關係數黃沙時期為0.91，非黃沙時期相關係數在0.95以上，碳成分比對結果黃沙時期相關係數為0.78，非黃沙時期為0.95，硫酸鹽比對在黃沙時期相關係數為0.95，硝酸鹽則為0.8，非黃沙時期硝酸鹽比對結果，相關係數為0.87。雖然人工與自動儀器比對有很好的相關性，但自動儀器監測值大多低於人工量測值。去年黃沙事件影響明確的時間，顯然帶來大量的大陸沙塵。今年黃沙事件PM2.5質量濃度與PM10質量濃度變化趨勢一致，且佔PM10質量濃度大多數。 The major goals of this work are executing quality assurance checkups on aerosol monitoring from supersite and validating monitoring data. To achieve this goal, the standard operating procedures for performance audit are established and regular and irregular audits are performed. At the end of October, this work had accomplished seven monthly regular checkups, two irregular checkups, half-of-the-year calibration on instruments, and five monthly meetings for performance coordination. From January to October 2003, data availability for instruments in supersite is as follows. 98% for PM10, 98% for PM2.5, 87% for PM2.5 carbon, 77% for PM2.5 nitrate, 66% for PM2.5 sulfate, 75% for PM2.5 PAH, 99% for PM2.5 black carbon, 77% for aerosol light-scattering coefficient, 95% for aerosol size distribution from submicron to micron size, 90% for aerosol size distribution from nanometer to submicron size. The downtime for PM2.5 sulfate was 3 months and PM2.5 nitrate measurement had occasionally low values. This year, more than 30 intercomparisons between manual sampling and continuous measurement were accomplished in yellow dust (YD) and non-yellow-dust (NYD) periods. The correlation coefficient for PM2.5 measurement was 0.91 in YD and 0.95 in NYD period. PM2.5 carbon measurement was correlated well at 0.95 for NYD period and moderately at 0.78 for YD period. PM2.5 sulfate got only YD comparison at 0.95 for correlation coefficient. For PM2.5 nitrate measurement, it showed a correlation coefficient at 0.8 for YD and 0.87 for NYD, respectively. Although a good correlation was found for instrument intercomparison, the values from continuous measurement are consistently lower than that from manual sampler. It was observed a great amount of transported dusts from significant YD events last year. This year, however, more PM2.5 in PM10 was observed and with a consistent high-and-low variation between PM2.5 and PM10. 研究期間：9204 ~ 9212 |
