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題 名 | A Preliminary Analysis of Chemical Characteristics of Atmospheric Pollutants and Their Deposition Budget on the Fu-shan Forest in Taiwan=臺灣福山試驗林大氣污染物的化學特性與沈降收支之先期分析 |
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作 者 | 林能暉; 李崇德; 詹長權; 許文昌; 張木彬; 林文龍; 洪朝安; 金恆鑣; 夏禹九; | 書刊名 | Terrestrial, Atmospheric and Oceanic Sciences |
卷 期 | 11:2 2000.06[民89.06] |
頁 次 | 頁481-500 |
分類號 | 436.12 |
關鍵詞 | 大氣污染物; 化學特性; 沈降收支; Dry deposition; Wet deposition; Sulfate; Nitrate; Aerosol particle; |
語 文 | 英文(English) |
英文摘要 | This paper presents the chemical characteristics of atmospheric pol-lutants measured at the Fu-Shan forest (620 m MSL) during two two-weeksfield experiments held in the summer and winter of 1993. Chemical com-positions of these atmospheric pollutants in solid, gaseous and liquid phaseswere analyzed. The deposition budget of S and N compounds through dryand wet deposition pathways were particularly assessed. As a result, aero-sol mass spectra were found to be bimodal, having the 50 cut size < 1.0p.m and around 3.2 u.m for fine and coarse modes, respectively. In summer,fine and coarse modes were primarily composed of ammonium sulfate andnitrate, respectively. But, in winter the coarse mode was dominated by seasalts due to the influence of northeast monsoon flows. Our average HNO2(~ 0.10 ppb) was appreciably higher than those observed in clean tropo-sphere, whereas HNO2 was at a comparable level. Meanwhile, ammoniagas and particulate ammonium were at a lower concentration level com-pared with those generally observed on the continental grounds. The SO2(< I ppb) was comparable with those frequently observed in the free tropo-sphere, while SO 2 was close to the lowest level typically obtained in urbanareas. In addition, NO@ which is thought to be associated with local pollu-tion was limited. Therefore, we believe that excessive SO 2, to a largerextent, was transported to the site via long-range transport, particularly inwinter. With regard to the deposition budget, wet deposition pathway (>90) was the most effective mechanism for delivering atmospheric S and N compounds to the Fu-Shan forest during the periods of our field experiments. |
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