Atmospheric Measurement Techniques Discussions www.atmos-meas-tech-discuss.net 1867-8610 3 2 2010 10.5194/amtd-3-1889-2010 http://www.atmos-meas-tech-discuss.net/3/1889/2010/ http://www.atmos-meas-tech-discuss.net/3/1889/2010/amtd-3-1889-2010.html http://www.atmos-meas-tech-discuss.net/3/1889/2010/amtd-3-1889-2010.pdf 1889 1932 2010-04-21 Retrieval of aerosol optical depth in vicinity of broken clouds from reflectance ratios: case study E. Kassianov Evgueni.Kassianov@pnl.gov M. Ovchinnikov L. K. Berg S. A. McFarlane C. Flynn R. Ferrare C. Hostetler M. Alexandrov Pacific Northwest National Laboratory, Richland, 99352 Washington, USA NASA Langley Research Center, Hampton, 23681 Virginia, USA NASA Goddard Institute for Space Studies, 10025 New York, USA A recently developed reflectance ratio (RR) method for the retrieval of aerosol optical depth (AOD) is evaluated using extensive airborne and ground-based data sets collected during the Cloud and Land Surface Interaction Campaign (CLASIC) and the Cumulus Humilis Aerosol Processing Study (CHAPS), which took place in June 2007 over the US Department of Energy (DOE) Atmospheric Radiation Measurement (ARM) Southern Great Plains site. A detailed case study is performed for a field of single-layer shallow cumuli observed on 12 June 2007. The RR method is applied to retrieve the spectral values of AOD from the reflectance ratios measured by the MODIS Airborne Simulator (MAS) for two pairs of wavelengths (660 and 470 nm and 870 and 470 nm) collected at a spatial resolution of 0.05 km. 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