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研究论文

The preliminary study on chemical characteristics of precipitation at Mt. Waliguan

摘要：报告了1997年在中国大气本底基准观象台(观测站点位于青海省瓦里关山)的降水化学观测结果.该站点位于我国北方高原的半干旱地区, 周围较少有局地污染排放源影响.对获得的59个降水样品进行了pH值、电导率和可溶性离子成分的分析, 其结果显示, 该地降水的年平均pH值为6.4, 呈中性;年平均电导率为14.8μS/cm, 降水较为洁净;降水中的主要离子成分依次为NH⁴⁺, Ca²⁺, SO₄^2-, Mg²⁺, Na⁺, NO^3-, Cl^-, K⁺, F^-离子, 各离子成分的浓度高于我国丽江地区的降水, 但阴阳离子成分的组成比例同丽江地区比较接近, NH⁴⁺和Ca²⁺离子浓度的比例比丽江地区降水略高;瓦里关地区降水的主要化学特征反映了我国北方大气背景地区降水的特点, 该站适合作为我国北方地区长期降水化学背景监测点.

Abstract：The paper presents the results in precipitation chemistry obtained at Mt. Waliguan (China Global Atmosphere Watch Baseline Observatory) in 1997.The site is located in the semi arid area in Northern China, and relatively isolated from the emissions of the population and industrial areas.The 59 samples were collected and analyzed for pH, conductivity and soluble inorganic components.The precipitation of that region is clean and neutral with the weighted average pH value of 6.4 and the weighted average conductivity of 14.8 μS/cm.The major ions are NH₄⁺, Ca²⁺, SO₄^2-, Mg²⁺, Na⁺, NO^3-, Cl^-, F^-.Though ion concentrations are higher than those of precipitation at Lijiang station in South west China, the distribution of the ions is close to those from Lijiang stations.The results indicated that the site is suitable for long term monitoring for the precipitation chemistry in northern China.