“…Such methods have been successfully applied over water [Griggs, 1975[Griggs, , 1979; Mekler et al, 1977;Koepke and Quenzel, 1979] to produce an operational product from NOAA-AVHRR measurements [Rao et al, 1989;Ignatov et al, 1995]. Most of the remote sensing studies have been devoted to Saharan dust [Fraser, 1976;Carlson, 1979;Norton et al, 1980;Dulac et al, 1992;Jankowiak and Tanr& 1992]. Over the land, so far there has been no real attempt to retrieve aerosol at a global scale.…”