深圳市近年来酸性降水特征及其成因分析研究

通过研究深圳市2006年-2012年的酸雨时空分布、降水的化学组成及其成因分析,结果表明,深圳市降水pH值的范围在3.18~8.73之间,平均值为5.36,属于酸雨污染较为严重的地区。深圳市在2006年-2012年间,降水的pH值有逐步下降的趋势,深圳市春夏季降水酸化程度较低,秋冬季酸化程度较高,主要与降水量直接相关。通过对降水的化学组分进行分析发现,深圳市酸雨类型硫酸和硝酸混合型,硫酸根和硝酸根对降雨中的pH值影响较大,雨水中的硫酸根和硝酸根主要来自工业和交通污染。

Analysis on Characteristics and Causes of Acidic Precipitation in Shenzhen in Recent Years

This study analyzes the temporal and spatial distributions, the chemical components, and the causes of the acid rain in Shenzhen during 2006 -2012. The research results show that the precipitation in Shenzhen has a pH between 3.18 and 8.73, and an average at 5.36. Accordingly, Shenzhen is a region that suffers acid rain pollution at a rather high degree. The pH of precipitation had gradually descended during 2006 - 2012. Acidification in Shenzhen is at a lower degree in spring and summer, but higher in autumn and winter. Such discrepancy correlates directly with the amount of precipitation. The analysis of chemical components shows that Shenzhen＇s precipitation can be categorized as mixed sulfuric and nitric acid rain. Sulfate and nitrate, substantially resulted from industrial and traffic pollution, have a greater impact on the pH of the precipitation.