5-Year study of rainwater chemistry in a coastal mega-city in South China
5-Year study of rainwater chemistry in a coastal mega-city in South China
复制标题
DOI：
10.1016/j.atmosres.2010.03.027
复制
发表时间：
2010-07-01
影响因子：
5.5
通讯作者：
Zeng, Li-Wu
中科院分区：
文献类型：
--
作者：
Huang, Xiao-Feng;Li, Xiang;Zeng, Li-Wu
我国南方是世界上酸雨危害最严重的地区之一，城市酸雨危害尤为严重。然而，在这一地区的雨水化学长期和全面的研究一直缺乏文献。为研究华南地区酸雨现状，对深圳市2005 - 2009年的208次降雨过程进行了系统的观测。体积加权平均值（VWM）的pH值为4.56，在五年中，酸雨频率为84.6%。结果表明，土壤中SO 42-含量最高，其次为Ca 2+、NH 4+、H+、NO3-、Cl-、Na+、Mg 2+、K+和F-。甲酸、乙酸和草酸共占总有机碳（TOC）含量的2.32%，占总游离酸的2.86%。SO 42-、NO3-、Ca 2+、NH 4+和TOC呈现出夏季低、冬季高的季节性变化趋势，而其他物种的季节性变化不明显。基于收集的数据，采用不同的统计技术对深圳市雨水中的物种来源进行了分析，结果表明人为污染对该地区雨水化学产生了强烈的影响。(C)2010爱思唯尔有限公司版权所有。
South China is one of the major regions suffering from acid rain in the world, especially for its urban environments. However, long-term and comprehensive studies on rainwater chemistry in this region have been scarce in the literature. In order to characterize the current acid rain status in South China, a total of 208 rainfall events were collected and measured systematically at an urban site in Shenzhen, a mega-city on the southeast coast of China, from 2005 to 2009. The volume-weighted mean (VWM) pH was observed to be 4.56 during the five years, with an acid rain frequency of 84.6%. SO42- was the most abundant ionic species, followed by Ca2+, NH4+, H+, NO3-, Cl-, Na+, Mg2+, K+ and F- in sequence. Formic, acetic and oxalic acids together contributed 2.32% to the total organic carbon (TOC) content and 2.86% to the total free acidity. SO42-, NO3-, Ca2+, NH4+ and TOC presented a seasonal trend of being lower in summer and higher in winter, while the other species did not show clear seasonal patterns. Based on the dataset, the sources of the species in rainwater in Shenzhen were explored using different statistical techniques, which indicated strong impact of anthropogenic pollution on the rainwater chemistry in this area. (C) 2010 Elsevier B.V. All rights reserved.