Optimal Estimation Retrieval of Aerosol Fine-Mode Fraction from Ground-Based Sky Light Measurements
AbstractIn this paper, the feasibility of retrieving the aerosol fine-mode fraction (FMF) from ground-based sky light measurements is investigated. An inversion algorithm, based on the optimal estimation (OE) theory, is presented to retrieve FMF from single-viewing multi-spectral radiance measurements and to evaluate the impact of utilization of near-infrared (NIR) measurements at a wavelength of 1610 nm in aerosol remote sensing. Self-consistency tests based on synthetic data produced a mean relative retrieval error of 4.5%, which represented the good performance of the OE inversion algorithm. The proposed algorithm was also performed on real data taken from field experiments in Beijing during a haze pollution event. The correlation coefficients (R) for the retrieved aerosol volume fine-mode fraction (FMFv) and optical fine-mode fraction (FMFo) against AErosol RObotic NETwork (AERONET) products were 0.94 and 0.95 respectively, and the mean residual error was 4.95%. Consequently, the inversion of FMFv and FMFo could be well constrained by single-viewing multi-spectral radiance measurement. In addition, by introducing measurements of 1610 nm wavelength into the retrieval, the validation results showed a significant improvement in the R value for FMFo (from 0.89–0.94). These results confirm the high value of NIR measurements for the retrieval of coarse mode aerosols. View Full-Text
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Zheng, F.; Hou, W.; Sun, X.; Li, Z.; Hong, J.; Ma, Y.; Li, L.; Li, K.; Fan, Y.; Qiao, Y. Optimal Estimation Retrieval of Aerosol Fine-Mode Fraction from Ground-Based Sky Light Measurements. Atmosphere 2019, 10, 196.
Zheng F, Hou W, Sun X, Li Z, Hong J, Ma Y, Li L, Li K, Fan Y, Qiao Y. Optimal Estimation Retrieval of Aerosol Fine-Mode Fraction from Ground-Based Sky Light Measurements. Atmosphere. 2019; 10(4):196.Chicago/Turabian Style
Zheng, Fengxun; Hou, Weizhen; Sun, Xiaobing; Li, Zhengqiang; Hong, Jin; Ma, Yan; Li, Li; Li, Kaitao; Fan, Yizhe; Qiao, Yanli. 2019. "Optimal Estimation Retrieval of Aerosol Fine-Mode Fraction from Ground-Based Sky Light Measurements." Atmosphere 10, no. 4: 196.
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