Ozone column retrieval from solar UV measurements at ground level: Effects of clouds and results from six European sites

Brogniez, Colette; Houët, Mickaël; Siani, Anna Maria; Weihs, Philipp; Allaart, Marc; Lenoble, J.; Cabot, T.; Casinière, A. de La; Kyrö, E.

doi:10.1029/2005jd005992

Cited by 22 publications

(20 citation statements)

References 13 publications

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“…With this technique, it is possible to retrieve ozone under clear sky and cloudy conditions. A previous study (Brogniez et al, 2005) has shown that under cloudy conditions the daily ozone mean is a rather good estimation of the true value. The uncertainties on the ozone retrieval are about 3% on clear sky and on cloudy days, the performance depends on the cloudiness: for example for cloudiness lower than 4 octas, the averaged uncertainty is about 4%, when cloudiness is larger than 4 octas, the averaged uncertainty is about 7%.…”

Section: Ozone Retrievalmentioning

confidence: 99%

Comparison of OMI ozone and UV irradiance data with ground-based measurements at two French sites

et al. 2008

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Abstract. Ozone Monitoring Instrument (OMI), launched in July 2004, is dedicated to the monitoring of the Earth's ozone, air quality and climate. OMI is the successor of the Total Ozone Mapping Spectrometer (TOMS) instruments and provides among other atmospheric and radiometric quantities the total column of ozone (TOC), the surface ultraviolet (UV) irradiance at several wavelengths, the erythemal dose rates and the erythemal daily doses. The main objective of this work is to compare OMI data with data from ground-based instruments in order to use OMI products (collection 2) for scientific studies. The Laboratoire d'Optique Atmosphérique (LOA) located in Villeneuve d'Ascq (VdA) in the north of France performs solar UV measurements using a spectroradiometer. The site of Briançon in the French Southern Alps is also equipped with a spectroradiometer operated by Interaction Rayonnement Solaire Atmosphère (IRSA). The OMI total ozone column data is obtained from the OMI-TOMS and OMI-DOAS algorithms. The comparison between the TOC retrieved with ground-based measurements and OMI-TOMS data shows good agreement at both sites for all sky conditions with a relative difference for most of points better than 5%. For OMI-DOAS data, the agreement is generally better than 7% and these data show a significant dependence on solar zenith angle. Comparisons of spectral UV on clear sky conditions are also satisfying with relative differences smaller than 10% except at solar zenith angles larger than 65 • . On the contrary, results of comparCorrespondence to: V. Buchard (buchard@loa.univ-lille1.fr) isons of the erythemal dose rates and erythemal daily doses for clear sky show that OMI overestimates surface UV doses at VdA by about 15% and that on cloudy skies, the bias increases. At Briançon, such a bias is observed if data corresponding to snow-covered surface are excluded.

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Section: Ozone Retrievalmentioning

confidence: 99%

Comparison of OMI ozone and UV irradiance data with ground-based measurements at two French sites

et al. 2008

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“…Satellite ozone and UV data derived from TOMS were exhaustively validated by means of ground-based ozone and UV data (Brogniez et al, 2005;Fioletov et al, 2002;Arola et al, 2005;Kazantzidis et al, 2006). Brogniez et al (2005) found a reasonably good agreement between satellite ozone data and ground-based measurements retrieved in six European sites: generally the ground-based ozone seems to be slightly higher than TOMS ozone (less than 3%). Regarding UV data, Fioletov et al (2002) found that erythemal UV estimates from TOMS demonstrate better agreement with ground-based measurements in case of low level of pollution.…”

Section: Introductionmentioning

confidence: 99%

Comparison of total ozone and erythemal UV data from OMI with ground-based measurements at Rome station

2008

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Abstract. Ground-based total ozone and surface UV irradiance measurements have been collected since 1992 using Brewer spectrophotometer at Rome station. Erythemal Dose Rates (EDRs) have been also determined by a broad-band radiometer (model YES UVB-1) operational since 2000. The methodology to retrieve the EDR and the Erythemal Daily Dose (EDD) from the radiometer observations is described. Ground-based measurements were compared with satellitederived total ozone and UV data from the Ozone Monitoring Instrument (OMI). OMI, onboard the NASA EOS Aura spacecraft, is a nadir viewing spectrometer that provides total ozone and surface UV retrievals. The results of the validation exercise showed satisfactory agreement between OMI and Brewer total ozone data, for both OMI-TOMS and OMI-DOAS ozone algorithms (biases of −1.8% and −0.7%, respectively). Regarding UV data, OMI data overestimate ground based erythemally weighted UV irradiances retrieved from both Brewer and YES Radiometer (biases about 20%). The effect of aerosols on UV comparisons was investigated in terms of Aerosol Optical Depth (AOD), showing mediumlarge correlation at SZA larger than 55 • . Further sources of uncertainty, such as the difference in the atmospheric conditions between local noon and OMI overpass time and the OMI spatial resolution, were also discussed.

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“…The OMI UV algorithm is based on the Total Ozone Monitoring System (TOMS) heritage (Krotkov et al, 1998Tanskanen et al, 2006). TOMS and OMI UV data validation results were presented in several papers, analysing in details their strengths and weaknesses (Brogniez et al, 2005;Fioletov et al, 2002;Arola et al, 2005;Kazantzidis et al, 2009;Arola et al, 2009;Ialongo et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Use of satellite erythemal UV products in analysing the global UV changes

et al. 2011

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Abstract. Long term changes in solar UV radiation affect global bio-geochemistry and climate. The satellite-based dataset of TOMS (Total Ozone Monitoring System) and OMI (Ozone Monitoring Instrument) of erythemal UV product was applied for the first time to estimate the long-term ultraviolet (UV) changes at the global scale. The analysis of the uncertainty related to the different input information is presented. OMI and GOME-2 (Global Ozone Monitoring Experiment-2) products were compared in order to analyse the differences in the global UV distribution and their effect on the linear trend estimation.The results showed that the differences in the inputs (mainly surface albedo and aerosol information) used in the retrieval, affect significantly the UV change calculation, pointing out the importance of using a consistent dataset when calculating long term UV changes. The areas where these differences played a major role were identified using global maps of monthly UV changes. Despite the uncertainties, significant positive UV changes (ranging from 0 to about 5 %/decade) were observed, with higher values in the Southern Hemisphere at mid-latitudes during springsummer, where the largest ozone decrease was observed.

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Ozone column retrieval from solar UV measurements at ground level: Effects of clouds and results from six European sites

Cited by 22 publications

References 13 publications

Comparison of OMI ozone and UV irradiance data with ground-based measurements at two French sites

Comparison of OMI ozone and UV irradiance data with ground-based measurements at two French sites

Comparison of total ozone and erythemal UV data from OMI with ground-based measurements at Rome station

Use of satellite erythemal UV products in analysing the global UV changes

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