https://scholars.lib.ntu.edu.tw/handle/123456789/77098
標題: | 臭氧乾沉降之土壤界面質傳阻抗分析研究-實驗與理論 | 作者: | 張能復 | 關鍵字: | 脫硝反應;乾沉降槽;沉降 曲線;質量守恆;並聯阻抗;Denitrifying;dry deposition chamber;dry deposition curve;mass conservation;parallel resistances | 公開日期: | 31-七月-2001 | 出版社: | 臺北市:國立臺灣大學環境工程學研究所 | 摘要: | 本研究以自行設計之乾沉降槽進 行臭氧之界面沉降實驗,實驗樣本以 台中農土及其調理土分別證明求算土 壤之反應性阻抗(reactive resistance) 及運動性阻抗(kinetic resistance)。理 論推導之數學沉降模式與實驗值具有 良好相關性,但低估臭氧濃度;反應 性阻抗與土溫呈現指數遞減,表現出 一階化學反應之特徵;運動性阻抗與 土溫呈現線性遞減,顯示熱力擴散性 質。土壤界面沉降阻抗(interfacial resistance)將因土壤之一氧化氮排放 量或土溫增加而呈現指數遞減,此現 象說明界面沉降阻抗為可變阻抗 (variable resistance)。 實驗結果說明土壤阻抗低於植物 及水體阻抗,因此土壤阻抗為臭氧沉 降之重要阻抗因子。可變阻抗之主要 影響因子為土溫及一氧化氮排放量, 因此評估空氣品質及沉降模式應考慮 沉降之可變阻抗特性,才能有效掌握 污染物之宿命。由於臭氧之沉降於土 壤造成二氧化氮生成(O3+NO→ NO2+O2),將因大氣光化學反應之作用而影響空氣品質;未來應建立本國之 土壤阻抗資料庫,提供空氣污染總量 管制及空氣品質模式之應用依據。 This study aims to design a dry deposition chamber and to measure ozone depletion over the Taichung field soil. This study seeks to verify the phenomena by an experimental and mathematical model. It is demonstrated that interfacial mass transfer resistances of ozone dry deposition involve reactive resistance (RSr) and kinetic resistance (RSk). The model profiles are smaller than the observed data and good correlation. It reveals the chemical reaction (O3+NO®NO2+O2) to produce the reactive resistance, it verifies that the interfacial mass transfer resistances are viable resistances and depend on nitrogen oxide emission and soil temperature. The reactive resistancedecreases exponentially with increasing soil temperature, and the kinetic resistance decreases linearly with increasing soil temperature. It shows that the interfacial mass transfer resistances (RS) are reduced with increasing NO emission or soil temperature. Results are consistent with thermodynamics and reaction kinetics. In this study that soil resistances are smaller than plant and water resistances. It reveals that soil resistances are variable resistances and major factor for ozone dry deposition. Ozone dry deposition over agricultural soil causes conversion of nitrogen oxide (NO) to nitrogen dioxide (NO2) and influencing the air quality. To set up the soil resistances are important to the air quality modeling and regulation in Taiwan. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/22061 | 其他識別: | 892211E002082 | Rights: | 國立臺灣大學環境工程學研究所 |
顯示於: | 環境工程學研究所 |
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892211E002082.pdf | 138.16 kB | Adobe PDF | 檢視/開啟 |
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