Retrieval of aerosol chemical composition from ground-based remote sensing data of sun-sky radiometers during haze days in Beijing winter

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Abstract

According to the aerosol optical properties, the aerosol chemical composition can be simplified as a mixture of five components. They are three absorbing components like Black Carbon (BC), Brown Carbon (BrC), and dust (DU); one scattering (non-absorbing) component of ammonium sulfate (AS) as well as aerosol water (AW), which is responsible for aerosol hygroscopic characteristics. In this study, we estimate the contents of the five chemical components of haze aerosols during January 2013 over Beijing from the ground-based remote sensing measurements. We find that BC, BrC, DU, AS and AW occupy 2%, 9%, 30%, 33%, and 26% in volume, respectively on average for the selected haze days, while they are 3%, 3%, 15%, 71%, and 8% on average for the selected clear days. As for the column mass concentration, BC, BrC, DU, AS and AW in the haze aerosol are 7,35, 166, 131, and 73 mg/m2 on average, while during the clear days they are 4,4,29, 78 and 6 mg/mJ on average. The comparisons of these remote sensing results with in situ BC and PM2.5 measurements are also presented in the paper. Results show that the retrievals agree well with the measurements, with coefficient R2 0.45 for BC and 0.85 for PM2.5.

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Wang, L., Li, Z., Ma, Y., Li, L., & Wei, P. (2013). Retrieval of aerosol chemical composition from ground-based remote sensing data of sun-sky radiometers during haze days in Beijing winter. Yaogan Xuebao/Journal of Remote Sensing, 17(4), 944–958. https://doi.org/10.11834/jrs.20133059

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