睢宁地区大气PM_(2.5)及气态污染物季节性变化特征

根据2014年全年实时在线观测数据,分析了徐州睢宁地区大气细颗粒物(PM_(2.5))和气态污染物(包括SO_2、CO、NO_x、O_3)质量浓度的季节性变化特征。结合后向轨迹模型,分析不同气团对该地区大气污染浓度的影响。PM_(2.5)与O_3值在夏季最低,呈显著相关,表明夏季PM_(2.5)主要受控于本地大气光化学活性。在冬季,除O_3外,PM_(2.5)、SO_2、CO、NO_x值最高,且大气颗粒物主要以细粒子为主。O_3在春季最高,并与远程传输的气团且经过我国东部污染源密集地区相对应。高浓度的PM_(2.5)主要与冬季缓慢移动的气团相对应,这可能将PM_(2.5)及其气态前体物传输至该地区进而加重大气污染程度。

Seasonal Variations of Atmospheric PM2.5 and Gaseous Pollutants in Suining

The seasonal variations of atmospheric fine particle matter (PM2.5) and gaseous pollutants (including SO2, CO, NOx and O3 ) on mass concentration were analyzed in Suining , Xuzhou, based on the data set of the real-time online measurements in full year 2014.Combined with the back trajectories model , the impact of different air masses on the concentration of atmospheric pollu-tants loading in this region was evaluated .The values of PM2.5 and O3 in summer showed the strong correlation , and presented the lowest concentration, indicating that the PM2.5 in summer was mainly controlled by local atmospheric photochemical activities .Dur-ing the winter, PM2.5, SO2, CO, NOx showed the highest concentration, except for O3, and the atmospheric aerosol was dominated by the fine particle .O3 in spring showed the highest concentration , and corresponded to the long-transport air masses from the devel-oped region of the East China .The high concentration of PM 2.5 was mainly corresponding to the slow air masses in winter .This im-plied that PM2.5 and its gaseous precursors might be transported to this region , which promoted the heavy pollution of air .