黄山夏季大气颗粒物中碳粒径分布特征及其输送潜在源区

Size distributions of carbonaceous aerosols and their potential sources at Mt.Huang during Summer

采用Anderson 9级撞击式采样器和DRI Model 2001A热/光碳分析仪对2014年6月30日~7月27日期间黄山光明顶大气气溶胶中有机碳（OC）和元素碳（EC）的质量浓度进行分析,并结合二次离子和后向轨迹讨论其潜在来源.结果表明,黄山光明顶OC、EC的平均质量浓度在PM1.1中分别为（2.89±1.40）,（0.14±0.19）μg/m3,在PM2.1中分别为（3.76±2.05）,（0.17±0.24）μg/m3,在PM9.0中分别为（5.60±2.96）,（0.18±0.25）μg/m3.OC和EC主要富集在≤0.43μm段,占PM9.0中OC、EC质量浓度的25.97%和51.10%.观测期间EC来自外部输送,OC既存在外部输送也存在局地贡献.根据后向轨迹模式,观测期间碳质颗粒的外部输送主要来源为东部城市群以及西北地区和武汉一带.

Aerosol particles were collected by an Anderson cascade impactor at Mt.Huang from June 30 to July 27, 2014 and the organic carbon （OC） and elemental carbon （EC） in these particles were determined by a DRI Model 2001 A carbon analyzer. Combined with secondary ion analyses and back trajectory model calculations, potential sources were discussed. Observations indicated that the average mass concentrations of OC and EC in PMH were （2.89±1.40）lag/m3. （0.14±0.19）μg/m3, （3.76±2.05）μg/m3 , （0.17±0.24）μg/m3in PM2.1and（5.60±2.96）μg/m3 , （0.184-0.25）/ag/m3 in PM9.0, respectively.OC and EC were mainly enriched in fine particles with sizes below 0.43p.m, mass concentration accounting for 25.97% of OC and 51.10% of EC in PMg.0.EC came from external transport and OC came from both external transport and local emissions.According to backward trajectory, external transport of carbon particles was from eastern urban areas, western-north and Wuhan during the observation period.