查詢結果分析
來源資料
頁籤選單縮合
題 名 | 臺中沿海地區酸沉降特性及其影響因子分析=Characteristics and Affecting Factors of Acid Deposition in the Taichung Coastal Area |
---|---|
作 者 | 鄭曼婷; 林明弘; 巫培任; 趙文燦; 林暐翔; | 書刊名 | 環境保護 |
卷 期 | 30:2 2007.12[民96.12] |
頁 次 | 頁59-71 |
分類號 | 328.631 |
關鍵詞 | 酸沉降; 主成份因子; 長程傳輸; Acid precipitation; SO₄□; Principal component analysis; Long-range transport; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究主要探討台中沿海地區大氣污染物酸沉降化學組成特性,並利用氮流逆軌跡模式及主成份因子分析法,探討不同天氣型態下雨水中硫酸鹽和硝酸鹽離子濃度分佈及酸雨中水溶性陰陽離子的可能污染來源。雨水採樣自2002年5月開始至2003年12月,採樣地點選擇台中沿海地區的沙鹿測站,採樣期間台中沿海地區雨水加權年平均pH值為4.7,主要酸性物種SO4(上標 2-)及NO3(上標 -)的濃度分別為:30.4及18.7μeq L^(-1),SO4(上標 2-)濃度較過去文獻中1991至1999年間量測之SO4(上標 2-)濃度82.4 μeq L^(-1)明顯降低,可能與此地區火力發電廠SO2年排放量自1999年後顯著的減量有關。主成份因子分析結果顯示此地區酸雨成份三個主要可能來源依序為二次氣膠、海盟飛沫及産業活動,然海盟的影響末如台北地區顯著。在東北季風盛行的季節。此地區和台灣其他地區相同,nss-SO4(上標 2-)濃度較其他天氣型態下高,東北季風天氣型態下SO4(上標 2-)平均為51.4μeq L^(-1),而太平洋高和西南氣流天氣型態下,雨水中nss-SO4(上標 2-)濃度分別30.2和15.9μeq L^(-1)。綜合不同天氣型態和逆軌跡分析,粗估東北季風天氣型態下雨水中nss-SO4(上標 2-)從中國大陸長程傳輸的貢獻約佔:30~40%。 |
英文摘要 | This study mainly investigated the characteristics of chemical compositions in the wet precipitations collected in the Taichung coastal area. To evaluate the characteristics of sulfate and nitrate species under various weather conditions, air parcel backward trajectories were used to analyze the likely contributing sources, to addition, the potential sources of water soluble ions in the rainwater were identified by using principal component analysis. Rainwater samples were collected at Shalu station during the period from May 2002 to December 2003. The annual volume-weighted mean pH value was 4.7 and concentrations of SO4(superscript 2-) and NO SO3(superscript -), were 30.4 and 18.7μeq L^(-1), respectively. The concentrations of SO4(superscript 2-) were significantly lower than those (82.4μeq L^(-1)) measured during the period from 1991 to 1999. The reason might be associated with the significant reduction of SO2 emission from the power plant located in the area. Three potential sources of the ionic species in the rainwater were secondary aerosols, seasalt and agricultural activities. However, the concentrations of seasalt were lower than those observed in Taipei area. During the northeast monsoon prevailing season, the mean concentration of nss-SO4(superscript 2-) was 51.4μpeq L^(-1) which was higher than those observed under the pacific high dominated weather (30.2μeq L^(-1)) and the southwest airflow season (15.9μeq L^(-1)). These phenomenon were similar to those in the other areas in Tam an. Based on the analysis in this study, there were 30%-40% SO4(superscript 2-) contributed by the long range transport from mainland China. |
本系統中英文摘要資訊取自各篇刊載內容。