Light-absorbing aerosol properties retrieved from the sunphotometer observation over the Yangtze River Delta, China

Applied Optics
Jing WangDan Xu

Abstract

In this study, aerosol optical depth (AOD) and extinction Ångström exponent (EAE) are derived from ground-based sunphotometer observations between 2007 and 2014 at urban sites of Nanjing over the Yangtze River Delta. In addition, the present study aims to investigate aerosol light-absorbing properties such as single-scattering albedo (SSA), absorption Ångström exponent (AAE), and the aerosol-absorbing optical depth (AAOD). The retrieval of aerosol properties is compared with AERONET inversion products. The results demonstrate that the retrieved AOD has a good agreement with the AERONET Level 1.5 data, with the root mean square error being 0.068, 0.065, and 0.026 for total, fine mode, and coarse mode at 440 nm, respectively. The SSA values indicate similar accuracies in the results, which are about 0.003, -0.009, -0.008, and 0.010 different from AERONET at 440, 670, 870, and 1020 nm, respectively. The occurrence frequency of background level AOD (AOD<0.10) at 440 nm in this region is limited (1%). Monthly mean AOD, SSA, the effective radius (Reff), and the volume concentration at 440 nm were 0.6-1.3, 0.85-0.92, 0.24-0.40 μm, and 0.18-0.28  μm3 μm-2, respectively. The mean value of AAOD at 440 nm (AAOD440) was the highest in both...Continue Reading

References

Sep 13, 2002·Nature·Yoram J KaufmanOlivier Boucher
Jul 4, 2012·Proceedings of the National Academy of Sciences of the United States of America·Chul E ChungDamien Decremer
Oct 10, 2012·Proceedings of the National Academy of Sciences of the United States of America·Ranjit BahadurV Ramanathan
Aug 12, 2014·Environmental Science and Pollution Research International·Huizheng CheGuangyu Shi

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