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Aerosol optical depth (AOD) is a significant indicator of dust episode. However, AOD retrieval over land still remains a difficult task because the measured signal is a composite of reflectance of sunlight by the variable surface covers and back scattering by the semitransparent aerosol layer. In this paper, an approach using bi-angle with Moderate Resolution Imaging Spectroradiometer (MODIS) data was presented. The derived AOD is compared to AERONET observations in the Washington State area and a retrieval error within 18% is found. Moreover, a dust episode in Washington State on October 4, 2009 was presented; we have analyzed the advection and dispersion of this event to get the possible source areas for the episode and its influence in the next day under the meteorological conditions.
Date of Conference: 25-30 July 2010