南京地区碳气溶胶的数值模拟研究

根据常规的SO2排放源资料以及NOx和HC交通源排放资料,建立了一种估算城市地区黑碳(BC)、有机碳(OC)源排放清单的方法,并利用此方法建立了南京地区碳气溶胶的源排放清单。同时运用NJU-CAQPS模式系统及二次有机气溶胶模式模拟分析了南京地区一次碳气溶胶(BC)、一次有机碳(POC)和二次有机气溶胶(SOC)的浓度分布特征。结果表明:在南京地区,机动车直接排放对城区一次碳气溶胶贡献率达到67.5%,机动车污染已成为主要来源;大气中的碳气溶胶浓度受到交通源(日变化)和气象条件(太阳辐射、温度、大气层结等)的共同影响;OC与BC的质量比冬季高于夏季,平均为2.62;SOC与OC的质量比夏季高于冬季,平均为19.8%。

Numerical Simulation on Carbonaceous Aerosol in Urban Area of Nanjing

An evaluation method of emission inventory of black carbon (BC) and organic carbon (OC) was established by means of conventional data of SO2 emission sources and vehicle sources of NOx and HC in urban area,and the emission inventory of carbonaceous aerosol was estimated using this method in Nanjing.At the same time,the simulation about primary carbonaceous aerosol (BC,primary organic carbon (POC)) and secondary organic aerosol(SOC) was done with NJU-CAQPS model and secondary organic aerosol model.The results showed that a rate of 67.5% was found that the vehicle emissions contribute to the carbonaceous aerosol in Nanjing.The motor vehicle had become a major source of pollution.The concentration of carbonaceous aerosol was correlated to the vehicle source (diurnal changes) and meteorological conditions(solar radiation,temperature,atmosphere layer,and so on).The mass ratio of OC and BC was higher in winter than that in summer with an average of 2.62,and the mass ratio of SOC and OC was higher in summer than that in winter with an average of 19.8%.