First results on GOMOS/ENVISAT

Bertaux, Jean-Loup; Hauchecorne, Alain; Dalaudier, Francis; Cot, C.; Kyrölä, E.; Fussen, D.; Tamminen, J.; Leppelmeier, G. W.; Sofieva, Viktoria; Hassinen, S.; d’Andon, O. Fanton; Barrot, G.; Mangin, A.; Théodore, B.; Guirlet, M.; Korablev, Oleg; Snoeij, P.; Koopman, R.; Fraïssé, R.

doi:10.1016/j.asr.2003.09.037

Cited by 67 publications

(46 citation statements)

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“…is a stellar occultation instrument onboard the ENVISAT satellite (see Bertaux et al (1991Bertaux et al ( , 2000Bertaux et al ( , 2004; Bertaux et al (2010); Kyrölä et al (2004); ESA (2001), http://envisat.esa. int/handbooks/gomos/ and other articles of this special volume).…”

Section: Gomos (Global Ozone Monitoring By Occultation Of Stars)mentioning

confidence: 99%

GOMOS O3, NO2, and NO3 observations in 2002–2008

et al. 2010

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Abstract. The Global Ozone Monitoring by Occultation of Stars (GOMOS) instrument onboard the European Space Agency's ENVISAT satellite measures ozone, NO 2 , NO 3 , H 2 O, O 2 , and aerosols using the stellar occultation method. Global coverage, good vertical resolution and the self-calibrating measurement method make GOMOS observations a promising data set for building various climatologies and time series. In this paper we present GOMOS nighttime measurements of ozone, NO 2 , and NO 3 during six years [2002][2003][2004][2005][2006][2007][2008]. Using zonal averages we show the time evolution of the vertical profiles as a function of latitude. In order to get continuous coverage in time we restrict the latitudinal region to 50 • S-50 • N. Time development is analysed by fitting constant, annual and semi-annual terms as well as solar and QBO proxies to the daily time series. Ozone data cover the stratosphere, mesosphere and lower thermosphere (MLT). NO 2 and NO 3 data cover the stratosphere. In addition to detailed analysis of profiles we derive total column distributions using the fitted time series.The time-independent constant term is determined with a good accuracy (better than 1%) for all the three gases. The median retrieval accuracy for the annual and semi-annual term varies in the range 5-20%. For ozone the annual terms dominate in the stratosphere giving early winter ozone maxima at mid-latitudes. Above the ozone layer the annual terms change the phase which results in ozone summer maximum up to 80 km. In the MLT the annual terms dominate up Correspondence to: E. Kyrölä (erkki.kyrola@fmi.fi) to 80 km where the semiannual terms start to grow. In the equatorial MLT the semi-annual terms dominate the temporal evolution whereas in the mid-latitude MLT annual and semiannual terms compete evenly. In the equatorial stratosphere the QBO dominates the time development but the solar term is too weak to be determined. In the MLT above 85 km the solar term grows significantly and ozone has 15-20% dependence on the solar cycle. For NO 2 below 32 km the annual summer maxima dominates at mid-latitudes whereas in the equatorial region a strong QBO prevails. In northern mid-latitudes a strong solar term appears in the upper stratosphere. For NO 3 the annual variation dominates giving rise to summer maxima. The NO 3 distribution is controlled by temperature and ozone.

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Section: Gomos (Global Ozone Monitoring By Occultation Of Stars)mentioning

confidence: 99%

GOMOS O3, NO2, and NO3 observations in 2002–2008

et al. 2010

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“…The height range covered by GO-MOS is typically between 15 km and 100 km. For more details about the instrument parameters, measurement characteristics and data processing, the reader can refer to Bertaux et al (2000Bertaux et al ( , 2004 and Kyrölä et al (2004Kyrölä et al ( , 2006.…”

Section: Datasets and Analysismentioning

confidence: 99%

Climatology and comparison of ozone from ENVISAT/GOMOS and SHADOZ/balloon-sonde observations in the southern tropics

Mzé¹,

Hauchecorne

Benchérif³

et al. 2010

Atmos. Chem. Phys.

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Abstract. In this paper, the stellar occultation instrument GOMOS is compared with ozonesondes from the SHADOZ network. We only used nighttime O 3 profiles and selected 8 Southern Hemisphere stations. 7 years of GOMOS datasets (GOPR 6.0cf and IPF 5.0) and 11 years of balloon-sondes are used in this study. A monthly distribution of GOMOS O 3 mixing ratios was performed in the upper-troposphere and in the stratosphere (15-50 km). A comparison with SHADOZ was made in the altitude range between 15 km and 30 km.In the 21-30 km altitude range, a satisfactory agreement was observed between GOMOS and SHADOZ, although some differences were observed depending on the station. The range for monthly differences generally decreases with increasing height and is within ±15%. It was found that the agreement between GOMOS and SHADOZ declines below ∼20 km. The median differences are almost within ±5%, particularly above 23 km. But a large positive bias was found below 21 km, in comparison to SHADOZ.

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“…GOMOS (http://envisat.esa.int/instruments/gomos; Kyrölä et al, 2004;Bertaux et al, 2004) on board the Envisat satellite is the first operational instrument that uses starlight for monitoring the atmospheric composition. The GOMOS spectrometers measure the stellar spectrum continuously as a star sets behind the Earth limb.…”

Section: Ozone Measurements By Gomos On Envisatmentioning

confidence: 99%

Spatio-temporal observations of the tertiary ozone maximum

et al. 2009

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Abstract. We present spatio-temporal distributions of the tertiary ozone maximum (TOM), based on GOMOS (Global Ozone Monitoring by Occultation of Stars) ozone measurements in [2002][2003][2004][2005][2006]. The tertiary ozone maximum is typically observed in the high-latitude winter mesosphere at an altitude of ∼72 km. Although the explanation for this phenomenon has been found recently -low concentrations of odd-hydrogen cause the subsequent decrease in odd-oxygen losses -models have had significant deviations from existing observations until recently. Good coverage of polar night regions by GOMOS data has allowed for the first time to obtain spatial and temporal observational distributions of night-time ozone mixing ratio in the mesosphere.The distributions obtained from GOMOS data have specific features, which are variable from year to year. In particular, due to a long lifetime of ozone in polar night conditions, the downward transport of polar air by the meridional circulation is clearly observed in the tertiary ozone maximum time series. Although the maximum tertiary ozone mixing ratio is achieved close to the polar night terminator (as predicted by the theory), TOM can be observed also at very high latitudes, not only in the beginning and at the end, but also in the middle of winter. We have compared the observational spatiotemporal distributions of the tertiary ozone maximum with that obtained using WACCM (Whole Atmosphere Community Climate Model) and found that the specific features are reproduced satisfactorily by the model.Correspondence to: V. F. Sofieva (viktoria.sofieva@fmi.fi) Since ozone in the mesosphere is very sensitive to HO x concentrations, energetic particle precipitation can significantly modify the shape of the ozone profiles. In particular, GOMOS observations have shown that the tertiary ozone maximum was temporarily destroyed during the January 2005 and December 2006 solar proton events as a result of the HO x enhancement from the increased ionization.

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First results on GOMOS/ENVISAT

Cited by 67 publications

References 4 publications

GOMOS O<sub>3</sub>, NO<sub>2</sub>, and NO<sub>3</sub> observations in 2002–2008

GOMOS O<sub>3</sub>, NO<sub>2</sub>, and NO<sub>3</sub> observations in 2002–2008

Climatology and comparison of ozone from ENVISAT/GOMOS and SHADOZ/balloon-sonde observations in the southern tropics

Spatio-temporal observations of the tertiary ozone maximum

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First results on GOMOS/ENVISAT

Cited by 67 publications

References 4 publications

GOMOS O&lt;sub&gt;3&lt;/sub&gt;, NO&lt;sub&gt;2&lt;/sub&gt;, and NO&lt;sub&gt;3&lt;/sub&gt; observations in 2002–2008

GOMOS O&lt;sub&gt;3&lt;/sub&gt;, NO&lt;sub&gt;2&lt;/sub&gt;, and NO&lt;sub&gt;3&lt;/sub&gt; observations in 2002–2008

Climatology and comparison of ozone from ENVISAT/GOMOS and SHADOZ/balloon-sonde observations in the southern tropics

Spatio-temporal observations of the tertiary ozone maximum

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Product

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GOMOS O<sub>3</sub>, NO<sub>2</sub>, and NO<sub>3</sub> observations in 2002–2008

GOMOS O<sub>3</sub>, NO<sub>2</sub>, and NO<sub>3</sub> observations in 2002–2008