The retrieval of vertical profiles of the ozone number density using Chappuis band absorption information and a multiplicative algebraic reconstruction technique

Publication: Canadian Journal of Physics
November 2007

Abstract

A new algorithm, SaskMART, is presented that uses observations of limb-scattered sunlight and a radiative transfer model to determine the ozone number-density profile up to 35 km altitude. In practice, clouds limit the lower extent of the retrieval to around 15 km but if the troposphere is clear the retrieval can be extended to altitudes as low as 10 km. SaskMART is an iterative Multiplicative Algebraic Reconstruction Technique that generates accurate results and is insensitive to the initial estimate of the ozone profile. Examples are presented using the OSIRIS limb-scattered radiance measurements and good agreement has been found when these results are compared with those derived from SAGE II measurements.
PACS Nos.: 33.20.Kf, 33.20.Lg, 42.68.Ca, 42.68.Mj, 92.60.H–, 92.60.hd

Résumé

Nous présentons un nouvel algorithme, SaskMART, qui utilise les observations de la lumière solaire diffusée par le limbe terrestre et un modèle de transfert radiatif pour déterminer les profils de densité d'ozone jusqu'à 35 km d'altitude. En pratique, les nuages limitent nos capacités d'observation aux altitudes plus élevées que 15 km, mais si la troposphère est claire, on peut les étendre aussi bas que 10 km. SaskMART est une technique de reconstruction algébrique multiplicative qui donne des résultats précis et est insensible aux estimés initiaux des profils d'ozone. Nous présentons des exemples qui utilisent des mesures de rayonnement diffusé par le limbe enregistrés par OSIRIS et nous trouvons un bon accord entre ces résultats ceux obtenus de SAGE~II.
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cover image Canadian Journal of Physics
Canadian Journal of Physics
Volume 85Number 11November 2007
Pages: 1225 - 1243

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Version of record online: 5 September 2011

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