CAJ | 학술논문

为研究北京市城区大气重污染特征,对2013年12月~2014年2月期间北京市6次大气重污染过程的PM2.5浓度水平、化学组成以及大气氧化性和气象要素特征进行了分析。结果表明,重污染日PM2.5平均质量浓度达到265.0μg/m3,是非重污染日的3.5倍。 PM2.5组分中NO3-,SO42-,NH4+和有机碳(OC)在重污染日的平均浓度分别是非重污染日的6.8,3.4,2.7和2.6倍。前3次过程中SO42-浓度最高,后3次过程中SO42-浓度与NO3-浓度接近。从气象要素来看,重污染期间的基本特征为地面温度升高、相对湿度增大、地面气压降低和风速减小。重污染日的能见度显著降低,平均能见度仅为非重污染日的34.4%。重污染日的大气氧化性明显增强,大气氧化剂OX平均浓度是非重污染日的1.5倍,(OC)/(EC)平均比值是非重污染日的1.6倍。
위연구북경시성구대기중오염특정,대2013년12월~2014년2월기간북경시6차대기중오염과정적PM2.5농도수평、화학조성이급대기양화성화기상요소특정진행료분석。결과표명,중오염일PM2.5평균질량농도체도265.0μg/m3,시비중오염일적3.5배。 PM2.5조분중NO3-,SO42-,NH4+화유궤탄(OC)재중오염일적평균농도분별시비중오염일적6.8,3.4,2.7화2.6배。전3차과정중SO42-농도최고,후3차과정중SO42-농도여NO3-농도접근。종기상요소래간,중오염기간적기본특정위지면온도승고、상대습도증대、지면기압강저화풍속감소。중오염일적능견도현저강저,평균능견도부위비중오염일적34.4%。중오염일적대기양화성명현증강,대기양화제OX평균농도시비중오염일적1.5배,(OC)/(EC)평균비치시비중오염일적1.6배。
In order to study the characteristics of heavy air pollution in urban Beijing, concentration levels and chemical components of PM2.5, atmospheric oxidation and meteorological elements in six heavy air pollution events during December 2013 and February 2014 were analyzed. The results showed that the average concentration of PM2.5 was 265.0 μg/m3 in heavy pollution days, which was 3.5 times of that in non-heavy pollution days. Concentrations of NO3-, SO42-, NH4+and OC in heavy pollution days were 6.8 times, 3.4 times, 2.7 times and 2.6 times of those in non-heavy pollution days, respectively. Concentration of SO42- was the highest in the first three events whereas concentrations of both SO42- and NO3- were high in the last three events. In heavy pollution days, ground temperature and relative humidity increased whereas surface pressure and wind speed decreased. In heavy pollution days, visibility decreased significantly, and the average visibility was 34.4% of that in non -heavy pollution days. Atmospheric oxidation in heavy pollution days increased significantly, and OX concentration and OC/EC ratio in heavy pollution days were 1.50 and 1.56 times of those in non-heavy pollution days, respectively.