| 南京夏秋季节大气干沉降水溶性离子特征及来源分析 |
| 摘要点击 2646 全文点击 1282 投稿时间：2015-11-12 修订日期：2016-01-11 |
| 查看HTML全文
查看全文 查看/发表评论 下载PDF阅读器 |
| 中文关键词 干沉降 水溶性离子 化学特征 来源 南京 |
| 英文关键词 dry deposition water-soluble ions chemical characteristics source apportionment Nanjing |
| 作者 | 单位 | E-mail | | 秦阳 | 南京信息工程大学, 气象灾害预报预警与评估协同创新中心, 中国气象局气溶胶-云-降水重点开放实验室, 南京 210044 | 316444718@qq.com | | 朱彬 | 南京信息工程大学, 气象灾害预报预警与评估协同创新中心, 中国气象局气溶胶-云-降水重点开放实验室, 南京 210044 | binzhu@nuist.edu.cn | | 邹嘉南 | 南京信息工程大学, 气象灾害预报预警与评估协同创新中心, 中国气象局气溶胶-云-降水重点开放实验室, 南京 210044 | | | 庞博 | 南京信息工程大学, 气象灾害预报预警与评估协同创新中心, 中国气象局气溶胶-云-降水重点开放实验室, 南京 210044 | |
|
| 中文摘要 |
| 本研究利用采集的2014年7~10月南京地区84个有效干沉降样品,探讨了南京夏秋季节大气干沉降中水溶性离子的化学组成及其来源.结果表明南京夏秋季干沉降样品平均pH为6.2,干沉降偏中性. Ca2+和NH4+是主要的阳离子,日均浓度分别为115.7 μeq·L-1和31.2 μeq·L-1,分别占阳离子总量的68.3%和18.6%.阴离子以SO42-、Cl-和NO32-为主,日均浓度为30.4、20.7和18.7 μeq·L-1,共占总阴离子的89.2%.干沉降浓度变化受温度湿度等气象条件和污染气团输送共同作用的影响,其中本地气团对干沉降污染的影响较大,干沉降污染具有局地性.南京夏秋季节固定源(燃煤)对大气干沉降水溶性离子的贡献大于移动排放源(机动车),8月因举办青奥会而采取的环境管控措施对固定源的影响大于移动源.主要离子来源分析表明NO3-和SO42-大部分源自于人为排放,Cl-主要为海洋输入,K+和Mg2+主要来自陆相输入. |
| 英文摘要 |
| A total of 84 effective dry deposition samples were collected from July to October, 2014 in Nanjing, and the chemical composition and source apportionment of water-soluble ions dry deposition in the summer and autumn season were discussed. The results indicated that the average pH was 6.2, and the dry deposition samples usually appeared neutral. Ca2+ and NH4+ were the major cations and their average daily concentrations were 115.7 μeq·L-1 and 31.2 μeq·L-1,accounting for 68.3% and 18.6% of total cations, respectively. SO42-, Cl- and NO32- were the main anions, and their average daily concentrations were 30.4, 20.7 and 18.7 μeq·L-1, a total of 89.2% of the total anions, respectively. High temperature and humidity of meteorological factors and contaminated air mass affected dry deposition. Local air mass had greater impact on dry deposition pollution, which indicated that dry deposition pollution had local property. In summer and autumn seasons in Nanjing, the stationary sources had more contributions to atmospheric dry deposition of water-soluble ions than mobile sources, while the environmental control measures for the Nanjing Youth Olympic Games had greater effect on stationary sources than mobile sources. Studies of the origins of major ions indicated that SO42- and NO32- were mostly attributed by the anthropogenic activities, and Cl- was mainly from ocean sources, while K+ and Mg2+ were mostly from the terrestrial input. |
|
|
|
