| 北京市夏季不同O3和PM2.5污染状况研究 |
| 摘要点击 3174 全文点击 1217 投稿时间：2015-08-07 修订日期：2015-09-30 |
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| 中文关键词 北京 夏季 O3 PM2.5 天气形势 化学组分 |
| 英文关键词 Beijing summer O3 PM2.5 synoptic situations chemical compositions |
| 作者 | 单位 | E-mail | | 王占山 | 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 | 18701650609@163.com | | 张大伟 | 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 | | | 李云婷 | 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 | lee_yunting@163.com | | 董欣 | 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 | | | 孙瑞雯 | 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 | | | 孙乃迪 | 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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| 中文摘要 |
| 从天气背景场、气象要素、前体物和PM2.5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O3和PM2.5污染状况进行了分析. 结果表明,O3达到中度污染而PM2.5浓度优良(O3和PM2.5一高一低)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O3和PM2.5同时达到中度污染(O3和PM2.5两高)的天气形势场为:高空为偏西气流,地面受低压控制. 与O3和PM2.5一高一低污染状况相比,O3和PM2.5两高时的气象要素特征为:偏南风更为明显和相对湿度更高. O3和PM2.5两高时污染物浓度演变特征为,O3和PM2.5的起始浓度较高,PM2.5日变化特征更为明显,而O3平均浓度却低于O3和PM2.5一高一低的污染状况. 前体物、大气氧化性以及PM2.5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O3和PM2.5两高污染状况中PM2.5浓度达到四级中度污染的主要原因. |
| 英文摘要 |
| 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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