Anhydrosugar characteristics in biomass smoke aerosol—case study of environmental influence on particle-size of rice straw burning aerosol

摘要: Abstract Burning of agricultural residues, such as rice straw, is a sizeable source smoke aerosol particularly in Asia. During field study on the subtropical island Taiwan ambient was examined for seasonal patterns terms size-resolved chemical composition. Ambient concentrations, size distributions and diagnostic ratios three anhydrosugars (levoglucosan, mannosan, galactosan), used molecular tracers biomass burning, are reported here. Levoglucosan concentrations showed strong dependence levels well distributions. wet (summer monsoon) season levoglucosan observed with average 437, 882 1116 ng m −3 PM 2.5 , 10 TSP, respectively. In contrast, winter/dry were lower 436, 448, 559 ng m The particle-size characterized by drastically increased coarse (PM 2.5−10 ) fraction summer season, which 36 times higher than during winter, likely due to fuel moisture content enhanced condensation, coagulation hygroscopic growth relatively fresh particles derived from straw burning. Furthermore, relative abundance characteristic signatures respect different types biomass.