| 层状云酸化过程的数值模拟 |
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| 引用本文： | 张行军,张远航,李金龙,秦 瑜.层状云酸化过程的数值模拟[J].环境科学研究,1996,9(5):1-4. |
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| 作者姓名： | 张行军 张远航 李金龙 秦 瑜 |
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| 作者单位： | 北京大学环境科学中心,北京 100871 |
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| 摘 要： | 修正和发展了一维层状云物理化学模式,该模式包括了详细的气?液相反应和光辐射传输,在我国东部地区平均污染水平下模拟了降水酸化过程?结果表明:光解系数在云顶为无云时的2～3倍,在云底则为无云时的0.2倍;自由基对S(Ⅳ)的氧化在降水后期可超过H2O2,并致使SO2-4和NO-3浓度在降水后期有逐渐增长的趋势;由于H2SO4和HNO3的不断生成以及NH3和气溶胶的洗脱,地面雨水酸度持续上升?
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| 关 键 词： | 酸 沉降层状云 光化学 |
| 收稿时间： | 1996/4/16 0:00:00 |
Simulation of Acidification of Stratiform Precipitation |
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| ZHANG Xingjun,ZHANG Yuanhang,LI Jinlong and QIN Yu.Simulation of Acidification of Stratiform Precipitation[J].Research of Environmental Sciences,1996,9(5):1-4. |
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| Authors: | ZHANG Xingjun ZHANG Yuanhang LI Jinlong and QIN Yu |
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| Affiliation: | Center of Environmental Sciences, Peking University,Beijing 100871 |
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| Abstract: | D physicochemical stratiform cloud model was modified and developed to couple with gaseous and aqueous chemical mechanisms as well as with radiation transfer. Precipitation acidification is simulated under the condition of average polluted atmosphere in Eastern China by using this model. The results show that the photolysis coefficient has a factor of 2-3 at cloud top and only 0.2 in cloud base, compared with that in cloudless condition. The role of radical to oxidize S(Ⅳ) in precipitation is exceed H2O2, which results in sulfate and nitrate concentration increasing gradually in later term of precipitation. Thus ground rainwater is getting more and more acidic due to continuous production of H2SO4 and HNO3 and washout of NH3 and aerosol. |
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| Keywords: | Acid precipitation Stratiform cloud Photochemistry |
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