Monitoring of ozone trend by stellar occultations: the GOMOS instrument

Bertaux, Jean-Loup; Mégie, G.; Widemann, Thomas; Chassefière, Éric; Pellinen, R.; Kyrölä, E.; Korpela, Seppo A.; Simon, P. C.

doi:10.1016/0273-1177(91)90426-k

Cited by 87 publications

(63 citation statements)

References 4 publications

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“…These instruments include OSIRIS (Optical Spectrograph and Infrared Imager System) on the Odin satellite [Warshaw et al, 1998;Llewellyn et al, 2004] and SCIA-MACHY (Scanning Imaging Absorption Spectrometer for Atmospheric Chartography) on Envisat [Bovensmann et al, 1999]. GOMOS (Global Ozone Measurement by Occultation of Stars) on Envisat [Bertaux et al, 1991] and SAGE (Stratospheric Aerosol and Gas Experiment) III on the Meteor-3M spacecraft [McCormick et al, 1991] are primarily occultation instruments that also have limb-scatter measurement capabilities.…”

Section: Introductionmentioning

confidence: 99%

Validation of Odin/OSIRIS stratospheric NO₂ profiles

Brohede¹,

Haley²,

McLinden³

et al. 2007

J. Geophys. Res.

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[1] This paper presents the validation study of stratospheric NO 2 profiles retrieved from Odin/OSIRIS measurements of limb-scattered sunlight (version 2.4). The Optical Spectrograph and Infrared Imager System (OSIRIS) NO 2 data set is compared to coincident solar occultation measurements by the Halogen Occultation Experiment (HALOE), Stratospheric Aerosol and Gas Experiment (SAGE) II, SAGE III, and Polar Ozone and Aerosol Measurement (POAM) III during the 2002-2004 period. Comparisons with seven Systeme d'Analyse par Observation Zenithal (SAOZ) balloon measurements are also presented. All comparisons show good agreement, with differences, both random and systematic, of less than 20% between 25 km and 35 km. Inconsistencies with SAGE III below 25 km are found to be caused primarily by diurnal effects from varying NO 2 concentrations along the SAGE III line-of-sight. On the basis of the differences, the OSIRIS random uncertainty is estimated to be 16% between 15 km and 25 km, 6% between 25 km and 35 km, and 9% between 35 km and 40 km. The estimated systematic uncertainty is about 22% between 15 and 25 km, 11-21% between 25 km and 35 km, and 11-31% between 35 km and 40 km. The uncertainties for AM (sunrise) profiles are generally largest and systematic deviations are found to be larger at equatorial latitudes. The results of this validation study show that the OSIRIS NO 2 profiles are well behaved, with reasonable uncertainty estimates between 15 km and 40 km. This unique NO 2 data set, with more than hemispheric coverage and high vertical resolution will be of particular interest for studies of nitrogen chemistry in the middle atmosphere, which is closely linked to ozone depletion.

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Section: Introductionmentioning

confidence: 99%

Validation of Odin/OSIRIS stratospheric NO₂ profiles

Brohede¹,

Haley²,

McLinden³

et al. 2007

J. Geophys. Res.

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“…Considering the case of 9 latitudes bands of 20 • each, Bertaux et al (1991) found that the smallest ozone trend detectable by GOMOS would be 0.05% per year, assuming a precision of ≈5%, and a natural variability of 4% at a given altitude (say, between 20 and 40 km). Indeed, the achieved precision is better than 5% on most stars observed, but the natural variability of ozone (at each altitude, season, latitude) was not well documented and this is something that can be achieved with GOMOS.…”

Section: Ozonementioning

confidence: 99%

“…An early estimate of GOMOS ozone trend performance may be found in Bertaux et al (1991), while the previous most comprehensive description of the GOMOS instrument and its science objectives may be found in the report of the ESA-formed Scientific Advisory Group (SAG) for GOMOS, written before launch, and summarizing about 10 years of activity of this group for the preparation of the GOMOS investigation , SAG Report ESA SP-1244. The present paper includes actual in-flight performances, observations and a brief overview of scientific results.…”

Section: Figmentioning

confidence: 99%

“…An estimate of the GOMOS ozone trend capabilities was made (Bertaux et al, 1991) by analogy with an earlier computation made by Frederick (1984). Frederick addressed the problem of the detection of ozone trend from one single ground station, performing measurements at regular intervals, t, sufficiently large that two consecutive measurements are completely de-correlated.…”

Section: Ozonementioning

confidence: 99%

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Global ozone monitoring by occultation of stars: an overview of GOMOS measurements on ENVISAT

et al. 2010

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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, H 2 O, NO 2 , NO 3 , air density, aerosol extinction, and O 2 . 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.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 O 2 and H 2 O.Correspondence to: J. L. Bertaux (bertaux@latmos.ipsl.fr) 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.

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“…The Global Ozone Monitoring by Occultation of Stars (GOMOS) onboard ENVISAT performs stellar occultation at wavelengths from the near UV through the visible region and produces profile of ozone, NO 2 , NO 3 , OCLO, and aerosol as standard products [1] In order to distinguish stellar light from the sky background, the detector is split into central (star), upper and lower bands (limb). If properly calibrated, backscattered radiances measured by GOMOS could be used to retrieve various gaseous species as well as aerosol extinction.…”

Section: Introductionmentioning

confidence: 99%

<title>Global ozone monitoring by occultation of stars</title>

Bertaux¹

1991

Future European and Japanese Remote-Sensing Sensors and Programs

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We analyzed a set of GOMOS bright limb measurements with solar zenith angles less than 80 o , and within 150 km of SAGE II measurements. In order to perform any species retrieval, GOMOS measurements were first corrected for stray light contamination. Ozone profile retrievals were performed using GOMOS data in the OMPS limb profiler algorithm in order to evaluate code functionality under different atmospheric conditions, assess the accuracy of the pointing algorithm, and identify potential improvements.The OMPS algorithm performs a simultaneous optimal estimation inversion of both Hartley-Huggins and Chappuis band radiances. GOMOS ozone retrievals are restricted to 25-53 km because of signal saturation and residual stray light. The retrieved ozone profiles agree with collocated SAGE II measurements on average to within 10%, and with a standard deviation of 10%. Retrieval results were consistent for both upper and lower GOMOS detector bands.

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Monitoring of ozone trend by stellar occultations: the GOMOS instrument

Cited by 87 publications

References 4 publications

Validation of Odin/OSIRIS stratospheric NO₂ profiles

Validation of Odin/OSIRIS stratospheric NO₂ profiles

Global ozone monitoring by occultation of stars: an overview of GOMOS measurements on ENVISAT

<title>Global ozone monitoring by occultation of stars</title>

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Monitoring of ozone trend by stellar occultations: the GOMOS instrument

Cited by 87 publications

References 4 publications

Validation of Odin/OSIRIS stratospheric NO2 profiles

Validation of Odin/OSIRIS stratospheric NO2 profiles

Global ozone monitoring by occultation of stars: an overview of GOMOS measurements on ENVISAT

<title>Global ozone monitoring by occultation of stars</title>

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Validation of Odin/OSIRIS stratospheric NO₂ profiles

Validation of Odin/OSIRIS stratospheric NO₂ profiles