重庆大气中臭氧浓度变化及其前体物的相关性分析

Correlation Analysis on Variation Characteristics of Surface Ozone Concentration and its Precursor Compounds in Chongqing

臭氧是城市光化学烟雾的主要成分,同时也是重要的温室气体,因此臭氧污染已经成为城市空气质量的重要因素。利用近几年臭氧连续监测的数据,对臭氧的浓度变化特征进行了分析,并且对臭氧前体物(NOx、NOy、VOCs等)和气象因素作了相关性分析。结果表示臭氧浓度呈典型的季节性变化趋势,并且小时值变化出现明显的日变化规律,与太阳辐射强度成正相关;另外VOCs(挥发性有机物)与臭氧的变化规律基本一致,同时与NOx、NOy的浓度变化趋势存在较好的负相关性。

Ozone is a main component of urban photochemical smog as well as an important greenhouse gas. It has a signifi- cant impact on the atmospheric quality. Based on the data obtained by consecutive monitoring in recent years, this paper analyzes the variation characteristics of surface ozone concentration and the correlations between ozone precursor compounds （ NOx, NOy, VOCs et al） and some meteorological factors. Ozone concentration showed a typical seasonal trend, while significant diurnal varia- tion and hourly change positively correlated with the intensity of solar radiation. VOCs （volatile organic compounds）are basically consistent with the variation of the ozone results. At the same time, there is a good negative correlation with NOx and NOy.