OClO slant column densities derived from GOMOS averaged transmittance measurements

Abstract : The Global Ozone Monitoring by Occultation of Stars (GOMOS) instrument on board the European platform ENVISAT (ENVironment SATellite) was dedicated to the study of the of Earth's atmosphere using the stellar occultation technique. The spectral range of the GOMOS spectrometer extends from the UV (ultra violet) to the near infrared, allowing for the retrieval of species such as O3, NO2, NO3, H2O, O2, air density, aerosol extinction and OClO. Nevertheless, OClO cannot be retrieved using a single GOMOS measurement because of the weak signal-to-noise ratio and the small optical thickness associated with this molecule. We present here the method used to detect this molecule by using several GOMOS measurements. It is based on a two-step approach. First, several co-located measurements are combined in a statistical way to build an averaged measurement with a higher signal-to-noise ratio; then, a differential optical absorption spectroscopy (DOAS) method is applied to retrieve OClO slant column densities (SCD). The statistics of the sets of GOMOS measurements used to build the averaged measurement and the spectral window selection are analyzed. The obtained retrievals are compared to results from two balloon-borne instruments. It appears that the inter-comparisons of OClO are generally satisfying (relative differences are about 15-60%). Two nighttime climatologies of OClO based on GOMOS averaged measurements are presented. The first depicts annual global pictures of OClO from 2003 to 2011. From this climatology, the presence of an OClO SCD peak in the equatorial region at about 35 km is confirmed and strong OClO SCD in both polar regions are observed (more than 1016 cm−2 in the Antarctic region and slightly less in the Arctic region), a sign of chlorine activation. The second climatology is a monthly time series. It clearly shows the chlorine activation of the lower stratosphere during winter. Moreover the equatorial OClO SCD peak is observed during all years without any significant variations. This very promising method, applied on GOMOS measurements, allowed us to build the first nighttime climatology of OClO using limb-viewing instruments.
Type de document :
Article dans une revue
Atmospheric Measurement Techniques, European Geosciences Union, 2013, 6 (11), pp.2953-2964. 〈10.5194/amt-6-2953-2013〉
Liste complète des métadonnées

Littérature citée [24 références]  Voir  Masquer  Télécharger

Contributeur : Catherine Cardon <>
Soumis le : vendredi 2 octobre 2015 - 17:47:20
Dernière modification le : mercredi 28 mars 2018 - 13:20:02
Document(s) archivé(s) le : dimanche 3 janvier 2016 - 10:56:53


Fichiers éditeurs autorisés sur une archive ouverte




C. Tétard, D. Fussen, F. Vanhellemont, C. Bingen, E. Dekemper, et al.. OClO slant column densities derived from GOMOS averaged transmittance measurements. Atmospheric Measurement Techniques, European Geosciences Union, 2013, 6 (11), pp.2953-2964. 〈10.5194/amt-6-2953-2013〉. 〈hal-00879784〉



Consultations de la notice


Téléchargements de fichiers