【摘要】 利用2007—2009年瓦里关本底台降水化学观测资料,分析了瓦里关降水的pH值、电导率及Cl-、NO-3、SO2-4、NH+4、K+、Na+、Ca2+、Mg2+等离子成分的分布特征。结果表明,瓦里关pH值和电导率的年平均值分别为6.60和21.26μs/cm,2007—2009年呈逐年升高趋势。根据pH值,瓦里关降水以中性降水为主,占总降水的65.13%,其次为碱性降水,酸雨最少。离子浓度大小排序依次为Ca2+>SO2-4>Na+>NH+4>Cl->Mg2+>NO-3>K+,且存在明显的季节变化特征,K+、Na+、Ca2+、Mg2+有相似的来源。瓦里关降水中SO2-4/NO3-的范围为0.35~16.48,平均值为3.07;2007—2009年SO2-4/NO-3值呈逐年下降趋势;SO2-4/NO-3全年存在两个峰值,分别在4月和9—10月。更多还原

【Abstract】 Based on the chemical composition of precipitation data in Waliguan from 2007to 2009,the pH value,conductivity and distribution characteristics of Cl-,NO-3,SO2-4,NH+4,K+,Na+,Ca2+and Mg2+are analyzed.Results show that the annual mean of pH and conductivity are 6.60and 21.26μs/cm,respectively,and they have rising trends from2007to2009.In terms of the pH value,the frequency of neutral-based precipitation is the most(65.13%),followed by the alkaline precipitation,and the acid rain is the least.The ion concentrations from high to low are Ca2+,SO2-4,Na+,NH+4,Cl-,Mg2+,NO-3and K+,respectively,which have obvious seasonal variations.The K+,Na+,Ca2+,and Mg2+have similar sources.The value of SO42-/NO3-in the precipitation varies from0.35 to 16.48,and the mean value is 3.07.The value of SO42-/NO3-has a falling trend from2007 to 2009.The annual variation of SO42-/NO3-has two peak values in April,and September-October,respectively.更多还原