Concentration Characteristics and Sources of Suzhou Black Carbon Aerosols in 2021
Black carbon(BC)was measured in Suzhou from December 1,2020 to November 30,2021,using a seven-channel aethalometer(AE-31).The variation characteristics of BC were obtained.BC sources were explored based on the aethalometer model,a hybrid single particle Lagrangian integrated trajectory model(HYSPLIT)and concentration weighted trajectory(CWT).The results showed the annual average concentration of BC was 1.29 μg/m3 with a standard deviation of 0.64 μg/m3,the BC concentration was the highest in the winter[(1.61±0.89)μg/m3],followed by the autumn[(1.34±0.61)μg·m3],spring[(1.23±0.48)μg/m3],and was the lowest in summer[(1.03±0.43)μg/m3].The daily variation of BC concentration on weekdays and holidays in each season showed a bimodal structure in the morning and evening.Besides,BC concentration was negatively correlated with wind speed,air temperature and precipitation,but not with relative humidity.The source apportionment of BC showed that compared with the solid fuel(e.g.,coal and biomass combustion),the liquid fuel(e.g.,vehicle emission)had higher contribution to total BC concentration during all seasons(74.2%～76.3%).The contribution of liquid fuel to the total BC was higher in summer,while solid fuel had a higher contribution in winter.The results of hybrid single particle Lagrangian integrated trajectory(HYSPLIT)and concentration weighted trajectory(CWT)showed that the potential sources of BC in Suzhou were slightly different in different seasons and were affected by the different air mass sources.However,the main potential source regions were from the southwest part.
Black carbon(BC)aerosolCharacteristics of concentrationSource apportionmentBackward trajectory
NETL
NSTL
万方数据
