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Proceedings Paper

Particle mass loading estimation from extinction data: application to satellite determination
Author(s): Victoria E. Cachorro; Didier Tanre
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Paper Abstract

Here the goal is to determine the existing correlation between aerosol mass loading M and extinction (tau) a((lambda) ) and in particular the possible improvement using the spectral dependence. The ratio M/(tau) a obviously depends on the aerosol size distribution model and so we first carried out a theoretical analysis to observe this dependence. Two functions were selected, the Junge and the lognormal function. Also, ground-based sun photometer measurements under variable atmospheric conditions were made during two campaigns in April and May in both 1986 and 1987 at M'bour, 80 Km south of Dakar, Senegal. The spectral dependence of the aerosol optical thickness is used to derive the columnar aerosol size distribution, its mass loading and hence the M-(tau) a relationship. Good correlations expressed by a power law have been established which can be used to estimate desert aerosol content within an acceptable margin of error. This associated error oscillates between +/- 8% and +/- 15%. However errors as high as 40% are reached in the estimation of M using the simple ratio formula. This improvement could be performed as well by satellite using the good spectral coverage of sensors like MODIS (EOS satellite) or MERIS (Envisat).

Paper Details

Date Published: 4 January 1995
PDF: 12 pages
Proc. SPIE 2311, Atmospheric Sensing and Modelling, (4 January 1995); doi: 10.1117/12.198586
Show Author Affiliations
Victoria E. Cachorro, Univ. de Valladolid (Spain)
Didier Tanre, Univ. de Valladolid (Spain)


Published in SPIE Proceedings Vol. 2311:
Atmospheric Sensing and Modelling
Richard P. Santer, Editor(s)

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