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We present the validation analysis of above-cloud aerosol optical depth(ACAOD) retrieved from the “color ratio” method applied to MODIS cloudy-skyreflectance measurements using the limited direct measurements made by NASA'sairborne Ames Airborne Tracking Sunphotometer (AATS) and Spectrometer forSky-Scanning, Sun-Tracking Atmospheric Research (4STAR) sensors. A thorough search of the airborne databasecollection revealed a total of five significant events in which an airbornesun photometer, coincident with the MODIS overpass, observed partiallyabsorbing aerosols emitted from agricultural biomass burning, dust, andwildfires over a low-level cloud deck during SAFARI-2000, ACE-ASIA 2001, andSEAC4RS 2013 campaigns, respectively. The co-located satellite-airbornematchups revealed a good agreement (root-mean-square difference  <  0.1), with mostmatchups falling within the estimated uncertainties associated the MODISretrievals (about −10 to +50 %). The co-retrieved cloud optical depth wascomparable to that of the MODIS operational cloud product for ACE-ASIA andSEAC4RS, however, higher by 30–50 % for the SAFARI-2000 case study. Thereason for this discrepancy could be attributed to the distinct aerosoloptical properties encountered during respective campaigns. A briefdiscussion on the sources of uncertainty in the satellite-based ACAODretrieval and co-location procedure is presented. Field experiments dedicatedto making direct measurements of aerosols above cloud are needed for theextensive validation of satellite-based retrievals

atmospheric measurement techniques

Validating MODIS above-cloud aerosol optical depth retrieved from “color ratio” algorithm using direct measurements made by NASA's airborne AATS and 4STAR sensors