Abstract
Abstract. We present the first nighttime measurements of OClO from a limb-viewing satellite instrument in the Arctic polar vortex. The relationship between OClO, NO2 and O3 slant column densities in the Arctic polar vortex are analyzed from the GOMOS measurements. The retrieval process is based on a differential optical absorption spectroscopy (DOAS) method applied on the weighted median GOMOS transmittances. A study of the longitudinal distributions of OClO, NO2 and O3 above 65° north in January 2008 is presented. It shows a strong halogen activation in the lower stratosphere and a strong denoxification in the entire stratosphere inside the Arctic polar vortex. Time series of temperatures and OClO, NO2 and O3 slant column densities for the winters 2002/2003 to 2007/2008 are also presented. They highlight the correlation between temperature, OClO and NO2. The GOMOS instrument appears to be a very suitable instrument for the monitoring of OClO, NO2 and O3 in the stratosphere during nighttime.
Highlights
Since the discovery of stratospheric ozone depletion by Farman et al (1985), several studies have been performed to better understand this recurrent phenomenon
We can not discuss more this observed anticorrelation because of the large error bars. This preliminary work focuses on the interactions between NO2, O3 and OClO in the Arctic polar vortex
The slant column densities of these species are retrieved during nighttime from Sirius occultations as observed by the Global Ozone Monitoring by Occultation of Stars (GOMOS) instrument
Summary
Since the discovery of stratospheric ozone depletion by Farman et al (1985), several studies have been performed to better understand this recurrent phenomenon (a historical review of this research can be found in Solomon, 1999). Like balloon-borne measurements, they are localised and do not give a global coverage Some of these satellite instruments used a nadir geometry to retrieve the total vertical column densities of OClO: this is the case for Global Ozone Monitoring Experiment (GOME) on ERS-2 (Burrows et al, 1999), SCanning Imaging Absorption spectroMeter for Atmospheric CHartographY (SCIAMACHY) onboard ENVISAT (Bovensmann et al, 1999) and Ozone Monitoring Instrument (OMI) on EOS-Aura (Levelt et al, 2006). Note that the Stratospheric Aerosol and Gas Experiment III (SAGE III) on the Meteor-3M satellite (McCormick et al, 1991) could perform lunar occultations and limb-scatter measurements in order to retrieve OClO vertical distributions but, for the moment, no results concerning this have been published. The Global Ozone Monitoring by Occultation of Stars (GOMOS) instrument on ENVISAT (see e.g., Bertaux et al, 1991; Kyrolaet al., 2004) is designed to retrieve the vertical concentrations of trace gases, including nighttime OClO. We analyze time series of these species in the Arctic regions for the winter 2002/2003 to 2007/2008
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
