Improved algorithm for MODIS satellite retrievals of aerosol optical thickness over land in dusty atmosphere: Implications for air quality monitoring in China

Authors

Jun Wang, University of Nebraska-Lincoln, Code 613.2, Climate and Radiation Branch, NASA Goddard Space FlightFollow
Xiaoguang Xu, University of Nebraska-LincolnFollow
R. Spurr, RT Solutions, IncFollow
Yuxuang Wang, Tsinghua University
Easan Drury, National Renewable Energy Laboratory

Date of this Version

2010

Citation

Remote Sensing of Environment 114 (2010) 2575–2583

Comments

This article is a U.S. government work, and is not subject to copyright in the United States.

Abstract

A new algorithm, using the Moderate Resolution Imaging Spectroradiometer (MODIS) satellite reflectance and aerosol single scattering properties simulated from a chemistry transport model (GEOS-Chem), is developed to retrieve aerosol optical thickness (AOT) over land in China during the spring dust season. The algorithmfirst uses a “dynamic lower envelope” approach to sample theMODIS dark-pixel reflectance data in lowAOT conditions, to derive the local surface visible (0.65 μm)/near infrared (NIR, 2.1 μm) reflectance ratio. Joint retrievals of AOT at 0.65 μm and surface reflectance at 2.1 μm are then performed, based on the time, location, and spectraldependent single scattering properties of the dusty atmosphere as simulated by the GEOS-Chem. A linearized vector radiative transfermodel (VLIDORT) that simultaneously computes the top-of-atmosphere reflectance and its Jacobian with respect to AOT, is used in the forward component of the inversion of MODIS reflectance to AOT. Comparison of retrieved AOT results in April and May of 2008 with AERONET observations shows a strong correlation (R=0.83), with small bias (0.01), and small RMSE (0.17); the figures are a substantial improvement over corresponding values obtained with the MODIS Collection 5 AOT algorithm for the same study region and timeperiod. Thesmall bias is partially due to the consideration of dust effect at 2.1 μmchannel, withoutwhich the bias is−0.05. The surface PM10 (particulate matterwith diameter less than 10 μm) concentrations derived using this improved AOT retrieval show better agreement with ground observations than those derived from GEOSChem simulations alone, or those inferred from the MODIS Collection 5 AOT. This study underscores the value of using satellite reflectance to improve the air quality modeling and monitoring.