| 2000~2014年北京市SO2时空分布及一次污染过程分析 |
| 摘要点击 2798 全文点击 1470 投稿时间：2015-04-28 修订日期：2015-06-03 |
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| 中文关键词 SO2 时空分布 北京 CAMx 污染事件 |
| 英文关键词 SO2 spatial and temporal distribution Beijing CAMx serious pollution incident |
| 作者 | 单位 | E-mail | | 程念亮 | 北京市环境保护监测中心, 北京 100048
北京师范大学水科学研究院, 北京 100875
中国环境科学研究院环境基准与风险评估国家重点实验室, 北京 100012 | 15001195306@163.com | | 张大伟 | 北京市环境保护监测中心, 北京 100048 | zhangdawei@bjmemc.com.cn | | 李云婷 | 北京市环境保护监测中心, 北京 100048 | | | 陈添 | 北京市环境保护局, 北京 100048 | | | 李金香 | 北京市环境保护监测中心, 北京 100048 | | | 董欣 | 北京市环境保护监测中心, 北京 100048 | | | 孙瑞雯 | 北京市环境保护监测中心, 北京 100048 | | | 孟凡 | 北京师范大学水科学研究院, 北京 100875
中国环境科学研究院环境基准与风险评估国家重点实验室, 北京 100012 | |
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| 中文摘要 |
| 根据2000~2014年北京市SO2监测数据,系统分析了SO2时空分布特征并采用数值模式(CAMx)模拟分析了一次重污染过程中北京市SO2来源.结果表明,2014年与2000年相比北京市SO2年均浓度累计约降低69%,SO2年均浓度的变化率为-3.5 μg ·(m3 ·a)-1; 北京市SO2的月均浓度呈U型分布,季节分布上整体呈现出冬季>春季>秋季>夏季的特征,采暖季SO2浓度明显高于非采暖季; 空间分布上北部及西部山区SO2浓度水平明显低于中心城区及西南、 东南部地区,受减排措施影响较大的石景山、 东四、 通州监测点的SO2浓度降低明显; 在2014年1月14~18日一次重污染过程中北京SO2存在明显的区域输送,PAST源示踪技术初步计算显示外来源对北京SO2浓度的贡献率为83%,其中北京周边高架点源电厂贡献占21%,北京4家主要燃煤电厂对全市SO2浓度贡献率约为3.5%. |
| 英文摘要 |
| Spatial and temporal distribution of SO2 during 2000-2014 was all analyzed based on the SO2 monitoring data that Beijing Municipal Environmental Monitoring Center released and the formation mechanism of a typical air pollution episode in January 2014 was also investigated by combining numerical model CAMx. Analysis results showed that mass concentration of ρ(SO2) in Beijing in 2014 decreased 69% compared to that in 2000 with an annual gradient from 2000 to 2014 of -3.5 μg ·(m3 ·a)-1. Monthly average concentration of SO2 changed in a U shape curve and from the lowest to the highest, and seasonal variations of SO2 concentrations were as follows: winter >spring >autumn >summer; concentration of SO2 in heating season was significantly higher than that in non heating season. Annual average concentration of SO2 was lower in northern and western regions while higher in six city area and southern area. Concentrations of SO2 at Shijingshan, Dongsi, Tongzhou monitoring sites were significantly decreased related to SO2 emission reduction measures. During a heavy air pollution process in January 14-18th 2014 there was obviously SO2 regional transportation and model simulation analysis based on PAST showed that the contribution of SO2 regional transport to Beijing was 83% with elevated power plants surrounding Beijing accounting for 21% and the four major Beijing power plants contributing about 3.5% to the SO2 concentration during this heavy air pollution process. |
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