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Monthly mean infrared (10 μm) dust layer aerosoloptical depth (AOD) and mean altitude are simultaneouslyretrieved over the tropics (30° S–30° N)from almost seven years of Atmospheric Infrared Sounder (AIRS)observations covering the period January 2003 to September2009. The method developed relies on the construction oflook-up-tables computed for a large selection of atmosphericsituations and follows two main steps: first, determination ofthe observed atmospheric thermodynamic situation and, second,determination of the dust properties. A very good agreement isfound between AIRS-retrieved AODs and visible optical depthsfrom the Moderate resolution Imaging Spectroradiometer(MODIS/Aqua) during the main (summer) dust season, inparticular for three regions of the tropical North Atlanticand one region of the north-western Indian Ocean.  Outsidethis season, differences are mostly due to the sensitivity ofMODIS to aerosol species other than dust and to the morespecific sensitivity of AIRS to the dust coarse mode.AIRS-retrieved dust layer mean altitudes are compared to theCloud-Aerosol Lidar with Orthogonal Polarization(CALIOP/CALIPSO) aerosol mean layer altitude for the periodJune 2006 to June 2009.  Results for a region of the northtropical Atlantic downwind of the Sahara show a good agreementbetween the two products (σ≈360 m).Differences observed in the peak-to-trough seasonal amplitude,smaller from AIRS, are principally attributed to the largedifference in spatial sampling of the two instruments. Theyalso come from the intrinsic limit in sensitivity of thepassive infrared sounders for low altitudes. These resultsdemonstrate the capability of high resolution infraredsounders to measure not only dust aerosol AOD but also themean dust layer altitude

Saharan dust infrared optical depth and altitude retrieved from AIRS: a focus over North Atlantic – comparison to MODIS and CALIPSO