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Abstract
Satellite measurements are needed to obtain global data sets. The Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) on board the CALIPSO satellite is operating since June 2006 providing vertical profiles of the aerosol particle backscatter and extinction coefficients.
In this work a comparison between space-borne and ground-based measurements at Évora, Portugal for two different aerosol properties will be done. The particle backscatter coefficient near the ground measured by CALIOP will be compared with the particle backscatter coefficient measured by a Nephelometer and the integrated extinction coefficient determined by CALIOP will be compared with the optical depths obtained by an AERONET sun photometer. Furthermore several factors influencing the results will be discussed. These factors are related to the averaging of measurements and to different definitions of the measured quantities (180 degree backscatter coefficient from the CALIOP instrument versus 90-180 degree backscatter coefficient from the Nephelometer, integrated extinction coefficient between the lowest altitude and the satellite for the CALIOP instrument, which depends on the terrain, versus integrated extinction coefficient between the height of the measuring site Évora and the sun determined by the sun photometer).