Other
Scientific paper
Oct 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010spie.7827e..13b&link_type=abstract
Remote Sensing of Clouds and the Atmosphere XV. Edited by Picard, Richard H.; Schäfer, Klaus; Comeron, Adolfo; van Weele, Michie
Other
Scientific paper
In site selection processes, one key parameter is the extinction coefficient. This parameter depends on aerosol load, water vapor content and atmospheric gazes. Actually a lot of satellite instruments give the aerosol optical thickness over the earth with good spatial and temporal resolutions. The determination of the extinction coefficient at elevated altitudes from photometric surface measurements at lower altitudes is very important in the field of site testing. In the first part of this paper we make a comparison between the extinction coefficient measured at ground level and the aerosol optical thickness measured from space at La Palma observatory in order to study the reliability of the aerosol satellite instruments. We used the most popular ones: MODIS Terra and Aqua, MISR and Envisat Meris. In the second part of the paper, we use three AERONET (Aerosol Robotic Network) stations close to one another at the Canary Islands; Izana (longitude=16.5°W, latitude=28.3° N, altitude= 2367m), La laguna (longitude=16.32°W, latitude=28.50°N, altitude=568 m) and Santa-Cruz Tenerife (longitude=16.25°W, latitude=28.5°N, altitude=52 m). The aerosol optical thicknesses relative to these stations were studied in order to develop some empirical relationships that help determine photometric quality of an astronomical observatory from satellite measurements (even with very low resolution) or from in-situ measurements of very low elevated nearby places. LIDAR (Ligth Detection and Ranging) data of Santa-Cruz Tenerife provided by the MPLNET (Micro-Pulse Lidar Network) network were also used.
Benkhaldoun Zouhai
Bounhir Aziza
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