Global ozone monitoring by occultation of stars: an overview of GOMOS measurements on ENVISAT 1LATMOS-IPSL, CNRS/INSU, UMR 8190, Univ. Versailles St-Quentin, Guyancourt, 78280, France
2Finnish Meteorological Institute, Earth Observation, Helsinki, Finland
3Institut d'Aeronomie Spatiale de Belgique, Brussels, Belgium
4ACRI-st, Sophia-Antipolis, France
5ESA, Esrin, Frascati, Italy
6IDEAS, Serco, Frascati, Italy
7EADS-Astrium, Toulouse, France
Received: 30 January 2010 – Published in Atmos. Chem. Phys. Discuss.: 16 April 2010 Abstract. GOMOS on ENVISAT (launched in February, 2002) is the first space instrument
dedicated to the study of the atmosphere of the Earth by the technique of
stellar occultations (Global Ozone Monitoring by Occultation of Stars). Its
polar orbit makes good latitude coverage possible. Because it is
self-calibrating, it is particularly well adapted to long time trend
monitoring of stratospheric species. With 4 spectrometers, the wavelength
coverage of 248 nm to 942 nm enables monitoring ozone, H2O, NO2,
NO3, air density, aerosol extinction, and O2. Two additional fast
photometers (with 1 kHz sampling rate) enable the correction of the effects
of scintillations, as well as the study of the structure of air density
irregularities resulting from gravity waves and turbulence. A high vertical
resolution profile of the temperature may also be obtained from the time
delay between the red and the blue photometer. Noctilucent clouds (Polar
Mesospheric Clouds, PMC) are routinely observed in both polar summers and
global observations of OClO and sodium are achieved.
Revised: 25 October 2010 – Accepted: 03 November 2010 – Published: 20 December 2010
The instrument configuration, dictated by the scientific objectives'
rationale and technical constraints, is described, together with the typical
operations along one orbit, along with the statistics from over 6 years of
operation. Typical atmospheric transmission spectra are presented and some
retrieval difficulties are discussed, in particular for O2 and H2O.
An overview is presented of a number of scientific results already published
or found in more detail as companion papers in the same ACP GOMOS special
issue. This paper is particularly intended to provide an incentive for the
exploitation of GOMOS data available to the whole scientific community in
the ESA data archive, and to help GOMOS data users to better understand the
instrument, its capabilities and the quality of its measurements, thus
leading to an increase in the scientific return.
Citation: Bertaux, J. L., Kyrölä, E., Fussen, D., Hauchecorne, A., Dalaudier, F., Sofieva, V., Tamminen, J., Vanhellemont, F., Fanton d'Andon, O., Barrot, G., Mangin, A., Blanot, L., Lebrun, J. C., Pérot, K., Fehr, T., Saavedra, L., Leppelmeier, G. W., and Fraisse, R.: Global ozone monitoring by occultation of stars: an overview of GOMOS measurements on ENVISAT, Atmos. Chem. Phys., 10, 12091-12148, doi:10.5194/acp-10-12091-2010, 2010.