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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union

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https://doi.org/10.5194/amt-2017-5
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
31 Mar 2017
Review status
This discussion paper is under review for the journal Atmospheric Measurement Techniques (AMT).
Estimation of aerosol complex refractive indices for both fine and coarse modes simultaneously based on AERONET remote sensing products
Ying Zhang1, Zhengqiang Li1, Yuhuan Zhang2, Donghui Li1, Lili Qie1, Huizheng Che3, and Hua Xu1 1State Environmental Protection Key Laboratory of Satellite Remote Sensing, Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing 100101, China
2Satellite Environment Center, Ministry of Environmental Protection, Beijing 100094, China
3Chinese Academy of Meteorological Sciences, Chinese Meteorological Administration, Beijing 100081, China
Abstract. Climate change assessment, especially model evaluation, needs to know complex refractive indices (CRI) of atmospheric aerosols, separately for both fine and coarse modes. However, the widely used aerosol CRI obtained by the global Aerosol Robotic Network (AERONET), correspond to total-column aerosol particles without separation for fine and coarse modes. This paper establishes a method to separate CRIs of fine and coarse particles based on AERONET aerosol products, including volume particle size distribution (VPSD), aerosol optical depth (AOD) and absorbing AOD. The method consists of VPSD breaking-down and sub-mode CRI separation parts and yields spectral CRIs for both fine and coarse modes simultaneously. Numerical experiment shows good performance for typical water-soluble, biomass burning and dust aerosol types and the estimated uncertainties on the retrieved sub-mode CRIs are about 0.11 (real part) and 78 % (imaginary part), respectively. One year measurements at AERONET Beijing site are processed and we obtain CRIs of 1.48-0.010i (imaginary part at 440 nm is 0.012) for fine mode particles and 1.49-0.004i (imaginary part at 440 nm is 0.007) for coarse mode particles, for the period of 2014–2015. Our results also suggest that both aerosol fine and coarse mode CRIs have distinct seasonal characteristics, particularly CRIs of fine particles in winter season are significantly higher than summer, due to possible anthropogenic influences.

Citation: Zhang, Y., Li, Z., Zhang, Y., Li, D., Qie, L., Che, H., and Xu, H.: Estimation of aerosol complex refractive indices for both fine and coarse modes simultaneously based on AERONET remote sensing products, Atmos. Meas. Tech. Discuss., https://doi.org/10.5194/amt-2017-5, in review, 2017.
Ying Zhang et al.
Ying Zhang et al.
Ying Zhang et al.

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