CAJ | 학술논문

对2012年12月至2013年11月北京城区12个自动空气监测子站的臭氧及其前体物的浓度进行了分析,探讨北京城区臭氧浓度的日变化特征以及与前体物的关系.研究发现,北京市城区臭氧在5~8月份维持相对较高浓度,其他月份则较低.臭氧浓度呈现单峰型分布,基本在15：00、16：00达到峰值；同时臭氧呈现较明显的“周末效应”,即周末臭氧浓度高于工作日浓度. CO、NO、NO2和NOx等前体物多呈现双峰型分布,与O3均呈显著的负相关性,相关性在夏季较低.通过大气氧化剂OX和NOx的拟合方程发现,冬季北京市城区OX在白天受区域 O3影响相对较大,在夜间受局地 NOx污染影响相对较大.计算了在理想情况下的城区 NO2光解速率,春季、夏季、秋季和冬季的平均值分别为0.180,0.209,0.169,0.149min-1.在白天臭氧的高浓度时段城区O3、NO和NO2体现出近似光化学平衡态的特征.
대2012년12월지2013년11월북경성구12개자동공기감측자참적취양급기전체물적농도진행료분석,탐토북경성구취양농도적일변화특정이급여전체물적관계.연구발현,북경시성구취양재5~8월빈유지상대교고농도,기타월빈칙교저.취양농도정현단봉형분포,기본재15：00、16：00체도봉치；동시취양정현교명현적“주말효응”,즉주말취양농도고우공작일농도. CO、NO、NO2화NOx등전체물다정현쌍봉형분포,여O3균정현저적부상관성,상관성재하계교저.통과대기양화제OX화NOx적의합방정발현,동계북경시성구OX재백천수구역 O3영향상대교대,재야간수국지 NOx오염영향상대교대.계산료재이상정황하적성구 NO2광해속솔,춘계、하계、추계화동계적평균치분별위0.180,0.209,0.169,0.149min-1.재백천취양적고농도시단성구O3、NO화NO2체현출근사광화학평형태적특정.
Concentration of ozone and its precursors from 12 automatic air monitoring stations in urban area of Beijing from December 2012 to November 2013 were analyzed to investigate their diurnal changes and correlation. The results showed that ozone concentration maintained relatively high from May to August while it was at a low level in other months. Ozone concentration exhibited a single peak distribution, with the peak appeared around 15:00 and 16:00, and in weekend the concentration was higher than weekdays. Ozone precursors, such as CO, NO, NO2 and NOx, showed bimodal distribution in most cases. Ozone and its precursors showed a negative correlation, and the correlation was weak in summer. According to the fitting equation of OX and NOx concentrations, atmospheric oxidants OX was mainly affected by regional O3 transmission during daytime in winter, and by local NOx pollution during nighttime in winter. The calculated photolysis rate of NO2 in an ideal situation showed that photolysis rate in spring, summer, autumn and winter was 0.180, 0.209, 0.169, 0.149min-1, respectively. The approximate photochemical equilibrium of O3, NO and NO2 was also observed in urban area with high O3 concentration during the day.