Characteristics and source apportionment of carbon components in PM2.5 in autumn and winter in cities of Fenhe Plain
Carbon is an important component of PM2.5,which has important effects on aerosol radiative forcing,global warming,atmospheric visibility and human health,etc.It is of great significance to analyze its characteristics and sources.In this study,PM2.5 samples were collected from November 2020 to January 2021 in Fenhe Plain cities,and the carbonaceous components in PM2.5 was analyzed using a heat/light analyzer.Meanwhile,sources apportionment of carbonaceous components in study area was performed via PMF.The results showed that the concentrations of PM2.5 were higher in Jinzhong(82.1 μg·m-3),Yuncheng(79.6 μg·m-3)and Linfen(74.4 μg·m-3).The organic carbon(OC)concentration was higher in Yuncheng(11.2 μg·m-3)and Linfen(11.0 μg·m-3),and the concentration of elemental carbon(EC)was higher in Jinzhong(6.0 μg·m-3)and Yuncheng(4.7 μg·m-3).The highest concentration of secondary organic carbon(SOC)was found in Yuncheng(3.0 μg·m-3),Sanmenxia(2.5 μg·m-3)and Linfen(2.5 μg·m-3),but Sanmenxia(40.3%)and Lvliang(32.4%)had a higher proportion of SOC to OC.Correlation analysis showed the OC,EC and SOC concentration of the cities in the Fenhe plain were significantly positively correlated with the pollutants of SO2,NO2 and CO during the sampling period,indicating that Fenhe plain cities were greatly affected by the emissions of coal,industry and vehicles.Results of source apportionment showed that coal combustion source(25.5%)contributed the most to carbon components in Fenhe Plain,followed by diesel vehicle exhaust(22.5%),gasoline vehicle exhaust(22.3%),dust source(18.3%),and biomass combustion source(11.4%)contributed the least.Coal combustion source is the main contributor to the carbonaceous components in Fenhe Plain cities and are the key sources to be controlled in this area.In addition,the impact of motor vehicles on the carbonaceous components should be paid attention to,especially diesel vehicles.This study reveals the pollution characteristics and sources of carbonaceous components in the cities of the Fenhe Plain in terms of concentration characteristics,concentration difference in cities and sources apportionment,which provides data support and management thoughts for local management on PM2.5 control.
fine particulate mattercarbonaceous componentsecondary organic carbonFenhe plain citysource apportionment
NETL
NSTL
万方数据
