Nighttime ozone profiles in the stratosphere and mesosphere by the Global Ozone Monitoring by Occultation of Stars on Envisat

Kyrölä, E.; Tamminen, J.; Leppelmeier, G. W.; Sofieva, Viktoria; Hassinen, S.; Seppälä, Annika; Verronen, Pekka T.; Bertaux, Jean-Loup; Hauchecorne, Alain; Dalaudier, Francis; Fussen, D.; Vanhellemont, F.; d’Andon, O. Fanton; Barrot, G.; Mangin, A.; Théodore, B.; Guirlet, M.; Koopman, R.; Miguel, L. Saavedra de; Snoeij, P.; Fehr, T.; Meijer, Yasjka; Fraïssé, R.

doi:10.1029/2006jd007193

Cited by 62 publications

(90 citation statements)

References 47 publications

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“…All these data permitted to validate the GOMOS previous operational processor v4.02 ozone profiles and evaluate biases for different conditions. The star temperature and magnitude determine the signal strength of the observed UV spectrum (Kyrölä et al, 2006). The magnitude defines the brightness of the star while the temperature is associated with the shape of the spectrum.…”

Section: Methodsmentioning

confidence: 99%

Mid-latitude ozone monitoring with the GOMOS-ENVISAT experiment version 5: the noise issue

et al. 2010

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Abstract. The GOMOS ozone profiles have been analysed to evaluate the GOMOS ability to capture the long-term ozone evolution at mid-latitudes during the expected recovery phase of the ozone layer. Version 5 of the operational GOMOS ozone data has been compared with data from two of the longest ground-based instruments based on different techniques and already involved with many other previous space instrument validations. Comparisons between ground-based and GOMOS data confirm the occurrence of spurious retrievals mainly occurring since 2006. Using a selected set of data it is shown that some bad retrievals are induced by the increasing dark charge of the detectors combined with an inadequate method for its correction. This effect does not only induce a continuous bias, but is rather exhibiting a bimodal distribution including the correct profiles and the bad retrievals. For long-term analyses it is recommended filtering the data according to background light conditions and star temperature (spectrum shape). The new method of the dark charge estimate proposed to be implemented in the version 6 of the ESA algorithm seems to significantly reduce the occurrence of such effects and should allow to monitor stratospheric ozone using GOMOS data with greater confidence.

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Section: Methodsmentioning

confidence: 99%

Mid-latitude ozone monitoring with the GOMOS-ENVISAT experiment version 5: the noise issue

et al. 2010

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“…Lossow et al (2008), using sub-mm radiometer (SMR) data from the Odin spacecraft (Murtagh et al, 2002), observed the MSAO in H 2 O mixing ratio, the maxima at 90 km occurring in the solstice periods. Kyrölä et al (2006Kyrölä et al ( , 2010, using Envisat/GOMOS (Global Ozone Monitoring by Occultation of Stars) data, found that ozone (O 3 ) at 90 km peaked in equinox periods and was approximately a factor of three lower in solstice periods. Huang et al (2008) and Smith et al (2008) found a similar variation in O 3 using data from TIMED/SABER (Sounding of the Atmosphere using Broadband Emission Radiometry).…”

Section: R L Gattinger Et Al: the Roles Of Vertical Advection And mentioning

confidence: 99%

“…For the seasonal variation of the O 3 profiles in the upper mesosphere the chosen reference measurements are the nighttime observations of Kyrölä et al (2006Kyrölä et al ( , 2010 made with the GOMOS instrument on Envisat. Their O 3 profiles, based on a direct measurements of stellar occultation, extended to an upper altitude of approximately 100 km.…”

Section: Msao Data Driving the Model Simulationmentioning

confidence: 99%

The roles of vertical advection and eddy diffusion in the equatorial mesospheric semi-annual oscillation (MSAO)

et al. 2013

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Observations of the mesospheric semi-annual oscillation (MSAO) in the equatorial region have been reported dating back several decades. Seasonal variations in both species densities and airglow emissions are well documented. The extensive observations available offer an excellent case study for comparison with model simulations. A broad range of MSAO measurements is summarised with emphasis on the 80–100 km region. The objective here is not to address directly the complicated driving forces of the MSAO, but rather to employ a combination of observations and model simulations to estimate the limits of some of the underlying dynamical processes. Photochemical model simulations are included for near-equinox and near-solstice conditions, the two times with notable differences in the observed MSAO parameters. Diurnal tides are incorporated in the model to facilitate comparisons of observations made at different local times. The roles of water vapour as the "driver" species and ozone as the "response" species are examined to test for consistency between the model results and observations. The simulations suggest the interactions between vertical eddy diffusion and background vertical advection play a significant role in the MSAO phenomenon. Further, the simulations imply there are rigid limits on vertical advection rates and eddy diffusion rates. For August at the Equator, 90 km altitude, the derived eddy diffusion rate is approximately 1 × 10⁶ cm² s⁻¹ and the vertical advection is upwards at 0.8 cm s⁻¹. For April the corresponding values are 4 × 10⁵ cm² s⁻¹ and 0.1 cm s⁻¹. These results from the current 1-D model simulations will need to be verified by a full 3-D simulation. Exactly how vertical advection and eddy diffusion are related to gravity wave momentum as discussed by Dunkerton (1982) three decades ago remains to be addressed

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“…A negative bias of −5% is found for GOMOS at h=45 km, while the MIPAS ozone profiles (ESA operational retrieval version IPF 4.61 and 4.62) have a positive bias of around 5% at h=20 km and h=35-45 km relative to the lidar profiles. Kyrölä et al (2006) show that GOMOS provides a higher precision at upper altitudes if only the bright star occultations are selected.…”

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confidence: 99%

Comparison and synergy of stratospheric ozone measurements by satellite limb sounders and the ground-based microwave radiometer SOMORA

et al. 2007

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Abstract.Stratospheric O 3 profiles obtained by the satellite limb sounders Aura/MLS, ENVISAT/MIPAS, EN-VISAT/GOMOS, SAGE-II, SAGE-III, UARS/HALOE are compared to coincident O 3 profiles of the ground-based microwave radiometer SOMORA in Switzerland. Data from the various measurement techniques are within 10% at altitudes below 45 km. At altitudes 45-60 km, the relative O 3 differences are within a range of 50%. Larger deviations at upper altitudes are attributed to larger relative measurement errors caused by lower O 3 concentrations. The spatiotemporal characteristics of the O 3 differences (satelliteground station) are investigated by analyzing about 2300 coincident profile pairs of Aura/MLS (retrieval version 1.5) and SOMORA. The probability density function of the O 3 differences is represented by a Gaussian normal distribution. The dependence of the O 3 differences on the horizontal distance between the sounding volumes of Aura/MLS and SOMORA is derived. While the mean bias (Aura/MLS -SOMORA) is constant with increasing horizontal distance (up to 800 km), the standard deviation of the O 3 differences increases from around 8 to 11% in the mid-stratosphere. Geographical maps yield azimuthal dependences and horizontal gradients of the O 3 difference field around the SOMORA ground station. Coherent oscillations of O 3 are present in the time series of Aura/MLS and SOMORA (e.g., due to traveling planetary waves). Ground-and space-based measurements often complement one another. We discuss the double differencing technique which allows both the cross-validation of Correspondence to: K. Hocke (klemens.hocke@mw.iap.unibe.ch) two satellites by means of a ground station and the crossvalidation of distant ground stations by means of one satellite. Temporal atmospheric noise in the geographical ozone map over Payerne is significantly reduced by combination of the data from SOMORA and Aura/MLS. These analyses illustrate the synergy of ground-based and space-based measurements.

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Nighttime ozone profiles in the stratosphere and mesosphere by the Global Ozone Monitoring by Occultation of Stars on Envisat

Cited by 62 publications

References 47 publications

Mid-latitude ozone monitoring with the GOMOS-ENVISAT experiment version 5: the noise issue

Mid-latitude ozone monitoring with the GOMOS-ENVISAT experiment version 5: the noise issue

The roles of vertical advection and eddy diffusion in the equatorial mesospheric semi-annual oscillation (MSAO)

Comparison and synergy of stratospheric ozone measurements by satellite limb sounders and the ground-based microwave radiometer SOMORA

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