Derivation of tropospheric aerosol properties from satellite observations
- 31 May 2010
- journal article
- Published by Cellule MathDoc/CEDRAM in Comptes Rendus Geoscience
- Vol. 342 (4-5), 403-411
- https://doi.org/10.1016/j.crte.2010.02.003
Abstract
Here we review the methods presently available and expected in the near future for retrieving the tropospheric aerosol properties using remote sensing. Since all aerosol properties cannot be derived from space, measurements performed from the surface of the Earth are used to adjust the parameters that are not directly accessible and to limit the variability of the parameters that present a weaker sensitivity. The aerosol properties derived include the column concentration (expressed by the aerosol optical depth), the size (given by distribution of the aerosol in 2 to 3 size modes or measurement of the Angström coefficient), composition (expressed by the refractive index), shape and vertical profile. The article is restricted to aerosols that are within the troposphere since the techniques used for stratospheric aerosols are very specific. Nous examinons dans cet article les méthodes actuelles ou bientôt disponibles, permettant de remonter aux propriétés des aérosols troposphériques à partir de données de télédétection. Les propriétés n’étant pas toutes accessibles depuis l’espace, les mesures sol restent nécessaires pour ajuster les paramètres inaccessibles ou pour limiter la gamme de variation des paramètres présentant une sensibilité insuffisante. Les propriétés retrouvées incluent la concentration intégrée sur la verticale (exprimée par l’épaisseur optique), la taille (exprimée par une distribution avec 2 ou 3 modes ou à partir du coefficient d’Angström), la composition (exprimée par l’indice de réfraction), la morphologie et le profil vertical. On se limite aux aérosols troposphériques, car les techniques utilisées pour les aérosols stratosphériques sont très spécifiques.Keywords
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