Interactive comment on “Measurement of aerosol optical depth and sub-visual cloud detection using the optical depth sensor (ODS)” by D. Toledo et al
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Reviewer #1: Synopsis: This paper provides a description of a rather innovative instrument to estimate aerosol optical depth. Readers are first reminded that this Optical Depth Sensor (ODS), was originally designed to fly on a mission to Mars. Thus, the instrument must be robust (preferably no moving parts), and must be able to account for changing calibration, such as when dust collects on windows. To a certain degree the authors appear to be successful. The ODS is based on the ratio of zenith scattered radiation at zenith to total radiation at all other geometries over the course of a day. This is performed at near UV and red wavelengths. Since their retrievals are based on this ratio, direct calibration drops out. The test this instrument for nearly a year at the Ouagadougou Africa site side by side with a Cimel sun photometer within the
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Interactive comment on “Measurement of aerosol optical depth and sub-visual cloud detection using the optical depth sensor (ODS)” by D. Toledo et al
Author’s response: This is a reasonable suggestion. We have changed the lines 15-18 in page 9620 by: "For testing the reliability of calculations, first the radiance simulated by SHDOM code was compared against the DISORT plane-parallel radiative transfer code and using different values of the number of streams. These comparisons were carried out for a total opacity of 0.5, a single scattering ...
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A small and sophisticated optical depth sensor (ODS) has been designed to work in the atmosphere of Mars. The instrument measures alternatively the diffuse radiation from the sky and the attenuated direct radiation from the Sun on the surface. The principal goals of ODS are to retrieve the daily mean aerosol optical depth (AOD) and to detect very high and optically thin clouds, crucial paramete...
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