【摘要】 对1991-2000年广州市降水化学成分特征、降水酸度、主要酸性污染气体浓度及各自的变化趋势进行分析,结果表明广州市降水酸化明显,但有逐步好转的迹象。降水化学成分中SO₄^2-对酸化仍起主要作用,但其作用略呈下降趋势,同时NO₃^-对降水的酸化作用呈上升趋势;Ca²⁺、NH₄⁺在中和降水的酸性方面仍起十分重要的作用,且两者的作用基本上保持稳定。大气中主要酸性气体的浓度对降水的酸度和酸雨频率有很大的影响,呈正相关的关系。更多还原

【Abstract】 Chemica composition characteristics,acidity,concentration of major acidic air pollutants and the variation tendency were analyzed for precipitation of 1991-2000 in Guangzhou city.It turns out that acidification of precipitation is obvious and presents moderate gradually.As a chemical composition,SO₄^2-is the major factor in influencing the acidity of precipitation greatly,but with a reducing influence.In addition,the influence on precipitation from NO₃^-is increasing.Ca²⁺and NH₄⁺play an important part in balancing the acidity of precipitation, both with a stable effect generally.Concentration of major acidic gases in the atmosphere has great influence on the acidity and frequency of precipitation,correlating with the acidity and frequency of precipitation positively.更多还原