| 摘要: | 吾人利用AGAGE 統計法分析2006 年4 月至2008 年3 月鹿林山 空氣品質背景監測站資料，以此決定此站背景大氣特徵與微量氣體濃 度之背景值，並進一步探討各源區的影響。 分析結果顯示， CO、O3 與PM10 背景值為 79 ppb、27 ppb 與5 μg m-3。兩年期間，背景狀態占整體61%，其次為PM10 事件（17%）、 生質燃燒事件（12%）與CO+ PM10 事件（7%）。西風帶氣流於春季 經中南半島與華南地區，並帶來當地生質燃燒污染物，造成CO、O3 與PM10 平均濃度達212 ppb、63 ppb 與27 μg m-3。PM10 事件為穩定 的大氣狀態使得風速過低，導致地表氣膠不易擴散；而CO 與CO+ PM10 事件多為境外傳輸自中國的污染物影響。海洋來源氣流的CO、 O3 與PM10 平均濃度約為69ppb、23 ppb、6.3 μg m-3；大陸性氣流來 源（西風帶與中國），則約為119 ppb、35 ppb、13.5 μg m-3。 與其他背景監測站比較，太平洋中的海島測站與鹿林山資料皆顯 夏季為最乾淨之季節。其中低對流層大氣測站顯示污染物高值出現於 冬季，而鹿林山與Manua Loa 的高對流層測站顯示高值出現為春季。 The purpose of this study is to determine the background values of CO, O3 and PM10 collected at Lulin Atmosphere Background Station (LABS) during the period of April 2006 to March 2008, using AGAGE statistical method. The impact of source regions on LABS is also studied. As a result, the background values of CO, O3 and PM10 concentrations are 79 ppb, 27 ppb and 5 ?g m-3, respectively. During this two-year period, the events of background condition, PM10, biomass burning and (CO+PM10) accounted for 61%, 17%, 12% and 7% of the time, respectively. In spring, westerly flow across southern China and Indo-China peninsula can bring up the biomass burning pollutants to LABS, resulting in higher average CO, O3 and PM10 concentrations to 212 ppb, 63 ppb and 27 ?g m-3, respectively. PM10 events were primarily due to stable atmosphere with low wind speed, inducing lower dispersion of aerosol particles. CO and CO+ PM10 events were attributed to the long-range transport of pollutants originated from China. Maritime average CO, O3 and PM10 concentrations were 69 ppb, 23 ppb, 6.3 ?g m-3, respectively, while, for continental origin, they were 119 ppb, 35 ppb and 13.5 ?g m-3, respectively. Compared with other atmosphere background stations, LABS and those stations located in the Pacific Ocean received cleaner air in summer. For some stations in lower troposphere, maximum levels of pollutants appeared in winter. In contrast, the stations in higher troposphere such as LABS and Mauna Loa Observatory had the maximum levels of pollutants in spring. |
