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当前位置: 首页 > 文章 > 基于场降雨数据的大气降水化学特征分析——以重庆市北碚区西南大学为例 西南大学学报(自然科学版) 2012,34 (2) 105-113
Position: Home > Articles > Analysis of Chemical Characteristics of Meteoric Precipitation Based on the Data of a Series of Rainwater——A Case Study of Southwest University,Beibei District,Chongqing Journal of Southwest University(Natural Science Edition) 2012,34 (2) 105-113

基于场降雨数据的大气降水化学特征分析——以重庆市北碚区西南大学为例

作  者：
陈虹利;李廷勇;周福莉;彭玲莉;李俊云
单  位：
西南大学地理科学学院
关键词：
北碚;大气降水;酸根离子;大气污染
摘  要：
对采集于重庆市北碚区2009年10月-2010年8月的48场雨水样品进行Cl-,NO3-,SO24-以及pH值和电导率(EC)的测试分析,发现该地区雨水中pH值变化范围为4～7.73,EC变化范围为14～379μs/cm,出现酸雨的频率为46%,并且在不同季节均可出现;每场降雨中离子质量浓度的不同及离子间的相互作用决定其pH值和EC的变化,但是两者不具相关性;雨水中Cl-,NO3-,SO24-三种离子质量浓度的总和变化范围为4.61～178.84mg/L,相互之间具有明显的相关性,并且这三种主要阴离子的质量浓度与雨水的EC呈显著相关性,体现出"夏季偏低,冬季偏高"的时间变化特征.这是由于夏季降水量较多,其稀释效应导致这些酸根离子质量浓度在夏季降水中浓度降低,而冬季由于降水量较少,雨水中的这些酸根离子质量浓度相对升高.SO24-为雨水中主要的致酸离子,与该地区以煤为主的能源结构一致.
译  名：
Analysis of Chemical Characteristics of Meteoric Precipitation Based on the Data of a Series of Rainwater——A Case Study of Southwest University,Beibei District,Chongqing
作  者：
CHEN Hong-li1,LI Ting-yong1,2,3,ZHOU Fu-li1, PENG Ling-li1,LI Jun-yun1 1.School of Geographical Sciences,Southwest University,Chongqing 400715,China; 2.State Key Laboratory of Loess and Quaternary Geology,Institute of Earth Environment,CAS,Xi'an 710075,China; 3.Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment(Chongqing University & Southwest University), Ministry of Education,Chongqing 400715,China
关键词：
Beibei district;meteoric precipitation;acid radical ion;air pollution
摘  要：
An investigation of the concentrations of Cl-,NO-3 and SO2-4,and on the monitored values of pH and electrical conductivity(EC) from the rainwater collected in 48 precipitation events during the period from October,2009 to August,2010 in Beibei district,Chongqing showed that the variation range of rainwater pH and EC were from 4 to 7.33 and from 14 to 379 μs/cm respectively.Acid rain occurred in various seasons of the year with a total frequency of 46%.The changes in pH and EC of the rainwater were determined by the difference in ion concentrations and the interactions among the ions in rainwater during every precipitation.However,there was no significant relevance between the pH and EC proxies.The summations(Σ) of the concentration of Cl-,NO-3 and SO2-4 anions in rainwater changed from 4.61 to 178.84 mg/L,and there were significant correlations among these anions.Σ was significantly correlated with EC of rainwater and characterized by higher values during the summer months and lower values during the winter months,which might be attributed to the dilution effect of rainwater during rainy summer and the accumulation of atmospheric impurity during winter.SO2-4 proved to be the dominant acid-inducing anion for the rainwater in Chongqing area,which was consistent with the local coal-dominated energy composition structure.

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