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Assessment of error in aerosol optical depth measured by AERONET due to aerosol forward scattering
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Assessment of error in aerosol optical depth measured by AERONET due to aerosol forward scattering
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Journal Article
Assessment of error in aerosol optical depth measured by AERONET due to aerosol forward scattering
2012
Overview
We present an analysis of the effect of aerosol forward scattering on the accuracy of aerosol optical depth (AOD) measured by CIMEL Sun photometers. The effect is quantified in terms of AOD and solar zenith angle using radiative transfer modeling. The analysis is based on aerosol size distributions derived from multi‐year climatologies of AERONET aerosol retrievals. The study shows that the modeled error is lower than AOD calibration uncertainty (0.01) for the vast majority of AERONET level 2 observations, ∼99.53%. Only ∼0.47% of the AERONET database corresponding mostly to dust aerosol with high AOD and low solar elevations has larger biases. We also show that observations with extreme reductions in direct solar irradiance do not contribute to level 2 AOD due to low Sun photometer digital counts below a quality control cutoff threshold. Key Points Assessment of AERONET AOD errors due to aerosol forward scattering
Publisher
Blackwell Publishing Ltd,American Geophysical Union,John Wiley & Sons, Inc
