Study On Size Distribution Of Organic Carbon And Elemental Carbon In Different Seasons In Guangdong Atmospheric Supersite

To understand the size distribution characteristics of carbon-containing particles in Heshan, the air was sampled by a ten-stage micro orifice uniform deposit impactor (MOUDI) in July, 2014 and January, 2015 in Guangdong Atmospheric Supersite. The organic carbon (OC) and elemental carbon (EC) were analyzed using a thermal/optical carbon analyzer (Sunset Lab Inc., USA). The results revealed that particlate matter (PM), OC and EC were mainly enriched in <3.2 mu m particle in Heshan summer and winter. OC and EC were more concentrated in the size range of 0.32-1.0 mu m. The mass concentrations in summer were (2.26 +/- 0.72) mu g/m(3) and (0.89 +/- 0.36) mu g/m(3) and in winter were (10.85 +/- 5.49) mu g/m(3) and (1.47 +/- 0.71) mu g/m(3) for OC and EC, respectively. It is demonstrated obviously that the OC concentrations in sunny days were greater than rainy days, but EC did not changed significantly. Higher mass concentrations of PM, OC and EC in all sizes were found in hazy days compared to clear days. The correlations between OC and EC as well as the mass concentration of SOC varied as the weather type changed.