Regional distribution of aerosol over land, derived from ATSR-2 and GOME

Two aerosol optical depth retrieval algorithms, using different instruments and different methods, are compared. The first method uses both the direct ional and the spectral information of the Along Track Scanning Radiometer 2 (ATSR-2) to compute the aerosol optical depth in the visible and near-infr ared ranges. The second algorithm uses data in the wavelength range between 0.340 mum and 0.400 mum from the Global Ozone Monitoring Experiment (GOME) to determine the aerosol optical depth in the ultraviolet. Both ATSR-2 and GOME are onboard the ERS-2 satellite. The two methods are applied to data from the ERS-2 overpass over northwestern Europe on 25 July 1995. The retri eved aerosol optical depths compare favorably. Also, there is good comparis on between satellite retrievals and ground-based measurements. Optical dept h images show a large aerosol plume over Belgium and northern France. Back- trajectories indicate that the sources for this aerosol plume are the indus trialized regions in Germany and Belgium. (C) Elsevier Science Inc., 2000.