Observational study on aerosol absorption at a rural site in Northern China
XIA Yunjie;WU Yunfei;GUO Zhenhai;ZHANG Jingbei;XIAO Xia;SONG Lei;ZHANG Renjian;Institute of Atmospheric Physics, Chinese Academy of Sciences, CAS Key Laboratory of Regional Climate-Environment for Temperate East Asia;Institute of Atmospheric Physics, Chinese Academy of Sciences,State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics;Huainan Academy of Atmospheric Sciences;Institute of Atmospheric Physics, Chinese Academy of Sciences, Center of Technical Support and Service;
Based on the observational data monitored by Aethalometer at the site of Shangyao in Huainan during 2014—2015, aerosol absorption properties and their impact factors of the typical rural area in Northern China were analyzed. During the observation period, the average absorption coefficient was(24.6±18.4) Mm-1 in 520 nm, showing strong spectrum dependence. The average absorption Angstrom exponent was 1.3 ±0.2, which indicated that biomass burning emissions in Huainan were serious and noteworthy. With the relations between absorption coefficients and wavelengths, the absorption Angstrom exponent of brown carbon aerosols from biomass burning was obtained, with an average of 2.7 ±0.7. Besides, the absorption coefficient was separated into two parts. Results showed that Huainan was most significantly affected by biomass burning from May to Jun, and October to January. In June 2014, for example, the heavy pollution in Huainan was mainly due to the crop straw burning occurred in local and the regional air pollution transported from Jiangsu and Zhejiang province.