Influence of sky radiance measurement errors on inversion-retrieved aerosol properties

Remote sensing of the atmospheric aerosol is a well-established technique that is currently used for routine monitoring of this atmospheric component, both from ground-based and satellite. The AERONET program, initiated in the 90's, is the most extended network and the data provided are current...

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Bibliographic Details
Published in:AIP conference proceedings 2013-05, Vol.1531 (1)
Main Authors: Torres, B., Toledano, C., Cachorro, V. E., Bennouna, Y. S., Fuertes, D., Gonzalez, R., Frutos, A. M. de, Berjon, A. J., Dubovik, O., Goloub, P., Podvin, T., Blarel, L.
Format: Article
Language:English
Subjects:
ACCURACY
AEROSOLS
AIR POLLUTION MONITORING
CALIBRATION
COMPUTERIZED SIMULATION
EARTH ATMOSPHERE
ERRORS
GEOSCIENCES
INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
OPTICAL RADAR
OPTICS
RADIOMETERS
REMOTE SENSING
SATELLITES
SKY
VALIDATION
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Summary:Remote sensing of the atmospheric aerosol is a well-established technique that is currently used for routine monitoring of this atmospheric component, both from ground-based and satellite. The AERONET program, initiated in the 90's, is the most extended network and the data provided are currently used by a wide community of users for aerosol characterization, satellite and model validation and synergetic use with other instrumentation (lidar, in-situ, etc.). Aerosol properties are derived within the network from measurements made by ground-based Sun-sky scanning radiometers. Sky radiances are acquired in two geometries: almucantar and principal plane. Discrepancies in the products obtained following both geometries have been observed and the main aim of this work is to determine if they could be justified by measurement errors. Three systematic errors have been analyzed in order to quantify the effects on the inversion-derived aerosol properties: calibration, pointing accuracy and finite field of view. Simulations have shown that typical uncertainty in the analyzed quantities (5% in calibration, 0.2 Degree-Sign in pointing and 1.2 Degree-Sign field of view) yields to errors in the retrieved parameters that vary depending on the aerosol type and geometry. While calibration and pointing errors have relevant impact on the products, the finite field of view does not produce notable differences.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.4804759