| 北京市夏季不同O3和PM2.5污染状况研究 |
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| 引用本文： | 王占山,张大伟,李云婷,董欣,孙瑞雯,孙乃迪.北京市夏季不同O3和PM2.5污染状况研究[J].环境科学,2016,37(3):807-815. |
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| 作者姓名： | 王占山 张大伟 李云婷 董欣 孙瑞雯 孙乃迪 |
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| 作者单位： | 北京市环境保护监测中心, 北京 100048;大气颗粒物监测技术北京市重点实验室, 北京 100048;北京市环境保护监测中心, 北京 100048;大气颗粒物监测技术北京市重点实验室, 北京 100048;北京市环境保护监测中心, 北京 100048;大气颗粒物监测技术北京市重点实验室, 北京 100048;北京市环境保护监测中心, 北京 100048;大气颗粒物监测技术北京市重点实验室, 北京 100048;北京市环境保护监测中心, 北京 100048;大气颗粒物监测技术北京市重点实验室, 北京 100048;北京市环境保护监测中心, 北京 100048;大气颗粒物监测技术北京市重点实验室, 北京 100048 |
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| 基金项目： | 环境保护公益性行业科研专项(201409005);国家科技支撑计划项目(2014BAC23B03);北京市优秀人才培养项目 |
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| 摘 要： | 从天气背景场、气象要素、前体物和PM_(2.5)化学组分、气团运动轨迹以及大气氧化性等方面对北京市夏季两种不同的O_3和PM_(2.5)污染状况进行了分析.结果表明,O_3达到中度污染而PM_(2.5)浓度优良(O_3和PM_(2.5)一高一低)污染状况的天气形势场为:高空为偏西北气流,地面受高压后部控制;而O_3和PM_(2.5)同时达到中度污染(O_3和PM_(2.5)两高)的天气形势场为:高空为偏西气流,地面受低压控制.与O_3和PM_(2.5)一高一低污染状况相比,O_3和PM_(2.5)两高时的气象要素特征为:偏南风更为明显和相对湿度更高.O_3和PM_(2.5)两高时污染物浓度演变特征为,O_3和PM_(2.5)的起始浓度较高,PM_(2.5)日变化特征更为明显,而O_3平均浓度却低于O_3和PM_(2.5)一高一低的污染状况.前体物、大气氧化性以及PM_(2.5)化学组分分析的结果表明,较高的起始浓度在不利气象条件下的积累和吸湿增长以及当天较大偏南风造成的区域传输可能是造成O_3和PM_(2.5)两高污染状况中PM_(2.5)浓度达到四级中度污染的主要原因.
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| 关 键 词： | 北京 夏季 O3 PM2.5 天气形势 化学组分 |
| 收稿时间： | 8/7/2015 12:00:00 AM |
| 修稿时间： | 2015/9/30 0:00:00 |
Different Air Pollution Situations of O3 and PM2.5 During Summer in Beijing |
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| WANG Zhan-shan,ZHANG Da-wei,LI Yun-ting,DONG Xin,SUN Rui-wen and SUN Nai-di.Different Air Pollution Situations of O3 and PM2.5 During Summer in Beijing[J].Chinese Journal of Environmental Science,2016,37(3):807-815. |
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| Authors: | WANG Zhan-shan ZHANG Da-wei LI Yun-ting DONG Xin SUN Rui-wen and SUN Nai-di |
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| Institution: | Beijing Municipal Environmental Monitoring Center, Beijing 100048, China;Beijing Key Laboratory of Atmospheric Particulate Monitoring Technology, Beijing 100048, China;Beijing Municipal Environmental Monitoring Center, Beijing 100048, China;Beijing Key Laboratory of Atmospheric Particulate Monitoring Technology, Beijing 100048, China;Beijing Municipal Environmental Monitoring Center, Beijing 100048, China;Beijing Key Laboratory of Atmospheric Particulate Monitoring Technology, Beijing 100048, China;Beijing Municipal Environmental Monitoring Center, Beijing 100048, China;Beijing Key Laboratory of Atmospheric Particulate Monitoring Technology, Beijing 100048, China;Beijing Municipal Environmental Monitoring Center, Beijing 100048, China;Beijing Key Laboratory of Atmospheric Particulate Monitoring Technology, Beijing 100048, China;Beijing Municipal Environmental Monitoring Center, Beijing 100048, China;Beijing Key Laboratory of Atmospheric Particulate Monitoring Technology, Beijing 100048, China |
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| Abstract: | Two different pollution situations of O3 and PM2.5 during summer in Beijing were analyzed from the perspective of synoptic situations, meteorological elements, precursors, atmospheric oxidation, back-trajectories of air mass and chemical compositions of PM2.5. The results showed that the synoptic situations in the pollution situation that O3 reached middle level pollution and PM2.5 maintained low concentrations (O3 high-PM2.5 low) could be characterized as northwest gas flow in 500 hPa height and high-pressure rear in the ground. Whereas the synoptic situations in the pollution situation that O3 and PM2.5 both reached middle level pollution (O3-PM2.5 high) could be characterized as westerly gas flow in 500 hPa height and low pressure in the ground. Compared with the O3 high-PM2.5 low situation, meteorological elements in O3-PM2.5 high situation could be characterized as stronger southerly winds and higher relative humidity. In the O3-PM2.5 high situation, initial concentrations of O3 and PM2.5 were higher and diurnal variations of PM2.5 were more significant, nevertheless, the average concentrations of O3 were lower than those in the O3 high-PM2.5 low situation, respectively. The analysis of precursors, atmospheric oxidation and chemical compositions of PM2.5 showed that the accumulation and hygroscopic growth of PM2.5 under unfavorable meteorological conditions as well as the regional transport caused by strong southerly winds might be the main factors leading to high PM2.5 concentrations in O3-PM2.5 high situation. |
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| Keywords: | Beijing summer O3 PM2 5 synoptic situations chemical compositions |
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