MODIS stands for MODerate resolution Imaging Spectroradiometer. This sensor, equipped with over 30 spectral channels from the visible into the infrared frequency range operates from aboard the EOS-TERRA and EOS-AQUA satellites since 2000 and 2002, respectively. Thanks to its high spectral resolution and the large number of different channels a large number of different atmospheric parameters can be retrieved. Here we refer to the aerosol parameter data sets.
The MODIS aerosol products are based on calibrated, geo-located reflectances of channels at wavelengths of 0.412, 0.47, 0.55, 0.65, 0.86, 1.24, 1.63, and 2.11 µm. Depending on the surface, i.e. bright or dark, ocean or land, different channels or channel combinations are used. In addition to the reflectances, information about the atmospheric temperature and moisture profiles (product MOD07/MYD07, see also MODIS Water Vapor & PWC and MODIS Temperature Profiles), the cloud cover, and snow & ice coverage is included; over the ocean sea ice information is included. Over land in addition - depending on the parameter to be retrieved and the channels used - also information about land cover type and vegetation cover, e.g. NDVI, is included. With the aid of models for aerosol type, composition and size distribution look-up-tables (LUT) of reflectances are generated. Via a maximum likelihood or best least-square fit (or similar) method aerosol optical depth (AOD), single scattering albedo, and the number of cloud condensation nuclei that correspond to the best match between measured and LUT reflectances are retrieved.
We list the aerosol parameters which we offer via ICDC in the parameter list.
More information about the data sets can be found on the MODIS-Atmosphere Group webpage and in the references section - here in particular in the ATBD and in the article by Hsu et al. (2013).
This is part of the level-3 MOD08/MYD08 data set derived from MOD04/MYD04 level-2 products of the MODIS Collection 006 product family, which download has been started in summer / fall 2015.
Last update of data set at ICDC: July 6, 2017