Cloud optical thickness and albedo retrievals from bidirectional reflectance measurements of POLDER instruments during ACE-2

The POLDER instrument is devoted to global observations of the solar radiat ion reflected by the Earth-atmosphere system. The airborne version of the i nstrument was operated during the ACE-2 experiment, more particularly as a component of the CLOUDYCOLUMN project of ACE-2 that was conducted in summer 1997 over the subtropical northeastern Atlantic ocean. CLOUDYCOLUMN is a c oordinated project specifically dedicated to the study of the indirect effe ct of aerosols. In this context, the airborne POLDER was assigned to remote measurements of the cloud optical and radiative properties, namely the clo ud optical thickness and the cloud albedo. This paper presents the retrieva ls of those 2 cloud parameters for 2 golden days of the campaign 26 June an d 9 July 1997. Coincident spaceborne ADEOS-POLDER data from 2 orbits over t he ACE-2 area on 26 June are also analyzed. 26 June corresponds to a pure a ir marine case and 9 July is a polluted air case. The multidirectional view ing capability of airborne POLDER is here demonstrated to be very useful to estimate the effective radius of cloud droplet that characterizes the obse rved stratocumulus clouds. A 12 mu m cloud droplet size distribution appear s to be a suitable cloud droplet model in the pure marine cloud case study. For the polluted case the mean retrieved effective droplet radius is of th e order of 6-10 mu m. This only preliminary result can be interpreted as a confirmation of the indirect effect of aerosols. It is consistent with the significant increase in droplet concentration measured in polluted marine c louds compared to clean marine ones. Further investigations and comparisons to in-situ microphysical measurements are now needed.