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研究论文

摘要：在Eulerian模式中,在大气氨浓度大于硝酸的条件下,简要讨论了各种污染物对雨水组成的影响.结果表明,在本文考虑的情况下,氨对SO₂气体洗脱和SO^2-形成的影响最大,且能抑制雨水的酸化;过氧化氢的作用略小于氨.气溶胶对雨水SO₄^2-浓度的贡献小于气体.云下H₂O₂和O₃氧化能力的大小取决于雨水的pH、降落距离和各自的浓度.在雨水pH高,降落距离短和各自浓度小时,O₃的氧化能力大于H₂O₂,反之则H₂O₂大于O₃.对韶关降水酸化的模拟表明,考虑气体污染物补充机制的Eulerian模式可以较好地模拟现场降水酸化过程.

Abstract：Effects of initial concentrations of atmospheric pollutants on composition of ground rainwater are discussed based on Eulerian model. A base gas scenario is designed to be with concentration of NH₃ gas much greater than that of HNO₃(g). The simulation results indicate that NH₃ is the most important gas for SO₃ gas scavenging and SO₄²-formation among various gases below-cloud at the conditions considered in this study, and the next is H₂O₂. The results also show that the oxidation rate of S(Ⅳ) by H₂O₂ and O₃ in raindrops depends on pH, fall distance below-cloud and their concentrations. At high pH value, short fall distance and low concentrations of H₂O₂ and O₃, S(Ⅳ) oxidation by O₃ is dominant, otherwise, S(Ⅳ) oxidation by H₂O₂ is more important than by O₃. The simulation for Shaoguan precipitation acidification shows that the results obtained by Eulerian model are generally consistent with that from field observations.