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Aerosol lidar intercomparison in the framework of the EARLINET project. 1. Instruments
Authors:Matthais Volker  Freudenthaler Volker  Amodeo Aldo  Balin Ioan  Balis Dimitris  Bösenberg Jens  Chaikovsky Anatoly  Chourdakis Georgius  Comeron Adolfo  Delaval Arnaud  De Tomasi Ferdinando  Eixmann Ronald  Hågård Arne  Komguem Leonce  Kreipl Stephan  Matthey Renaud  Rizi Vincenzo  Rodrigues José António  Wandinger Ulla  Wang Xuan
Affiliation:Max-Planck-Institut für Meteorologie, Bundesstrasse 55, 20146 Hamburg, Germany. matthias@gkss.de
Abstract:In the framework of the European Aerosol Research Lidar Network to Establish an Aerosol Climatology (EARLINET), 19 aerosol lidar systems from 11 European countries were compared. Aerosol extinction or backscatter coefficient profiles were measured by at least two systems for each comparison. Aerosol extinction coefficients were derived from Raman lidar measurements in the UV (351 or 355 nm), and aerosol backscatter profiles were calculated from pure elastic backscatter measurements at 351 or 355, 532, or 1064 nm. The results were compared for height ranges with high and low aerosol content. Some systems were additionally compared with sunphotometers and starphotometers. Predefined maximum deviations were used for quality control of the results. Lidar systems with results outside those limits could not meet the quality assurance criterion. The algorithms for deriving aerosol backscatter profiles from elastic lidar measurements were tested separately, and the results are described in Part 2 of this series of papers Appl. Opt. 43, 977-989 (2004)]. In the end, all systems were quality assured, although some had to be modified to improve their performance. Typical deviations between aerosol backscatter profiles were 10% in the planetary boundary layer and 0.1 x 10(-6) m(-1) sr(-1) in the free troposphere.
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