Method study on Filter-loading Compensation and Digital Filtering for Black Carbon Measurement in Regional Atmospheric Baseline

Black carbon (BC) aerosol has an important contribution to the local and global climate effects. For a long time, the research on the quality control, regional atmospheric baseline extraction and change trend of BC concentration is not enough. In this paper, two methods of filter-loading compensation and many of baseline data filtering methods are introduced. Based on the data of BC concentration of Lin'an station in Zhejiang Province, which is the regional atmospheric baseline observatory in China, the change of BC aerosol concentration and the observation results of seasonal characteristics in East China are analyzed. The results show that the accuracy of BC mass concentration obtained by dual-point correction combined with lanczos filter is 10% ~ 20% higher than that of direct measurement.