Alternative polarisation retrieval for SCIAMACHY in the ultraviolet - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Atmospheric Chemistry and Physics Année : 2005

Alternative polarisation retrieval for SCIAMACHY in the ultraviolet

Résumé

We introduce an alternative method for the retrieval of polarisation in the ultraviolet by the satellite spectrometer SCIAMACHY. Unlike the operational polarisation retrieval algorithm, this method does not use the Polarisation Measurement Devices (PMDs) onboard SCIAMACHY, but only requires the reflectance signal. This makes the algorithm more robust and less sensitive to calibration errors caused by either improper characterisation of the instrument's response functions (key data) or degradation of the optical components.

The alternative polarisation retrieval is able to retrieve the full state of atmospheric polarisation in the wavelength range between 330 and 400 nm, which is essentially the wavelength region covered by SCIAMACHY's PMD 1. This allows a direct comparison with the current operational product.

When we compare the alternative polarisation algorithm with the operational algorithm, we find in some cases agreement, but not in other cases. The alternative algorithm compares well with an analytical model of the polarisation of a cloud-free scene. Using the alternative algorithm the polarisation-sensitive feature in the SCIAMACHY reflectance around 350 nm is automatically corrected for.

Fichier principal
Vignette du fichier
acp-5-2099-2005.pdf (617.4 Ko) Télécharger le fichier
Origine : Accord explicite pour ce dépôt
Loading...

Dates et versions

hal-00295717 , version 1 (18-06-2008)

Identifiants

  • HAL Id : hal-00295717 , version 1

Citer

L. G. Tilstra, P. Stammes. Alternative polarisation retrieval for SCIAMACHY in the ultraviolet. Atmospheric Chemistry and Physics, 2005, 5 (8), pp.2099-2107. ⟨hal-00295717⟩

Collections

INSU EGU
77 Consultations
70 Téléchargements

Partager

Gmail Facebook X LinkedIn More