瓦里关大气降水的化学特征  

Chemistry characteristics of atmospheric precipitation in Waliguan

作　　者：张占峰[1] 王红磊[2] 德力格尔[1] 朱彬[2] 

机构地区：[1]中国大气本底基准观象台,青海西宁810001 [2]南京信息工程大学大气物理学院,江苏南京210044

出　　处：《大气科学学报》2014年第4期502-508,共7页Transactions of Atmospheric Sciences

基　　金：国家自然科学基金资助项目(40875978);江苏省"333"高层次人才培养工程项目(BRA2010121);江苏省"六大人才高峰"计划资助项目

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-、NO3-、SO42-、NH4＋、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21.26 μs/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＋ ＞SO24-＞Na＋ ＞NH4＋ ＞Cl-＞Mg2＋ ＞NO3-＞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SO42-/NO3-的范围为0.3516.48,平均值为3.07;2007-2009年SO42-/NO3-值呈逐年下降趋势;SO42-/NO3-全年存在两个峰值,分别在4月和9-10月.Based on the chemical composition of precipitation data in Waliguan from 2007 to 2009, the pH value,conductivity and distribution characteristics ofCl-、NO3-、SO42-、NH4＋、K＋、Na＋、Ca2＋、Mg2＋andare analyzed.Results show that the annual mean of pH and conductivity are 6. 60 and 21.26 μs/cm,re-spectively, and they have rising trends from 2007 to 2009. In terms of the pH value, the frequency ofneutral-based precipitation is the most（ 65.13% ）, followed by the alkaline precipitation, and the acidrain is the least.The ion concentrations from high to low are Ca2＋, SO2 Na ＋, NH4, C1- , Mg2＋ , NO3 andK＋, respectively, which have obvious seasonal variations. The K＋, Na＋, Ca2＋, and Mg2＋ have similarsources.The value of SO42-/NO3- in the precipitation varies from 0. 35 to 16. 48, and the mean value is3.07.The value of SO42-/NO3- has a falling trend from 2007 to 2009. The annual variation ofSO42-/NO3- has two peak values in April, and September-October,respectively.

关 键 词：降水化学 PH值 电导率 水溶性离子 瓦里关 

分 类 号：X517[环境科学与工程—环境工程]