Comparison of satellite‐derived UV irradiances with ground‐based measurements at four European stations

Kazantzidis, Andreas; Bais, A. F.; Gröbner, Julian; Herman, J. R.; Kazadzis, Stelios; Krotkov, Nickolay A.; Kyrö, E.; Outer, P. N. den; Garane, Katerina; Görts, P.C.; Lakkala, Kaisa; Meleti, C.; Slaper, H.; Tax, Rick; Turunen, T.; Zerefos, C. S.

doi:10.1029/2005jd006672

Cited by 52 publications

(73 citation statements)

References 17 publications

(30 reference statements)

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“…Satellite ozone and UV data were exhaustively validated by means of GB measurements, regarding TOMS; (Kalliskota et al, 2000;McKenzie et al, 2001;Krotkov et al, 2001;Fioletov et al, 2002;Meloni et al, 2005;Arola et al, 2005;Kazantzidis et al, 2006) and lately OMI; Ialongo et al, 2008;Weihs et al, 2008;Kazadzis et al, 2009;Buchard et al, 2008). All these validation studies converge to the following conclusions:…”

Section: S Kazadzis Et Al: Omi Sub-pixel Uv Irradiance and Aerosol mentioning

confidence: 95%

Spatial and temporal UV irradiance and aerosol variability within the area of an OMI satellite pixel

et al. 2009

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Abstract.Results of an experimental campaign that took place in the greater Thessaloniki area were used to investigate temporal and spatial UV variability within an OMI satellite pixel. UV irradiance and aerosol optical depth measurements were performed for a one month period at three sites characterized as urban, rural and industrial, depending on their location and possible local aerosol sources. OMI showed a general UV irradiance overestimation compared to all three sites and for all atmospheric conditions. During the campaign the standard deviation calculated from the three sites for UV irradiance at 324 nm was of the order of 26%. For cloudless days with high spatial aerosol variability, UV differences reached ±20% within the OMI pixel. For cloudy days UV differences up to 100% were found at the three sites, a percentage that depends on the ground-based data integration time used for the comparison. Here we tried to focus on the limitations when trying to interpret results of UV irradiance comparisons between OMI satellite and ground based stations, taking into account the UV variability within an OMI pixel, due to such small scale spatial cloud and aerosol inhomogeneities.

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Section: S Kazadzis Et Al: Omi Sub-pixel Uv Irradiance and Aerosol mentioning

confidence: 95%

Spatial and temporal UV irradiance and aerosol variability within the area of an OMI satellite pixel

et al. 2009

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“…Therefore, satellite derived products need to be validated with ground-based measurements. Previous comparisons between satellite surface UV data provided by TOMS and ground-based measurements have been extensively done (Kalliskota et al, 2000;McKenzie et al, 2001;Cede et al, 2004;Arola et al, 2005;Kazantzidis et al, Published by Copernicus Publications on behalf of the European Geosciences Union.…”

Section: Introductionmentioning

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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“…Many studies have demonstrated the ability (and limitations) of spaceborne measurements to assess the groundlevel UV radiation (Eck et al, 1995;Herman et al, 1999;Kalliskota et al, 2000;Matthijsen et al, 2000;Krotkov et al, 2001;Kazantzidis et al, 2006;Arola et al, 2009;Kazadzis et al, 2009). Cloud effects for summer periods derived from the International Satellite Cloud Climatology Project (IS-CCP) data -cloud fraction and optical depth -perform a little worse than derived from the reflectivity (Matthijsen et al, 2000;Williams et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

Applying spaceborne reflectivity measurements for calculation of the solar ultraviolet radiation at ground level

et al. 2012

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Abstract. Long-term analysis of cloud effects on ultraviolet (UV) radiation on the ground using spaceborne observations requires the use of instruments that have operated consecutively. The longest data record can be built from the reflectivity measurements produced by the instruments Total Ozone Mapping Spectrometers (TOMS) flown on Nimbus 7 from 1979 to 1992, TOMS on Earth Probe from 1996 to 2005, and the Ozone Monitoring Instrument (OMI) flown on EOS Aura since 2004. The reflectivity data produced by TOMS on Earth Probe is only included until 2002. A comparison is made with cloud effects inferred from ground-based pyranometer measurements at over 83 World Radiation Data Centre stations. Modelled UV irradiances utilizing the standard reflectivity are compared with measurements of UV irradiances at eight European low-elevation stations. The reflectivity data of the two TOMS instruments shows a consistent agreement, and the required corrections are of low percentage, i.e. 2-3 %. In contrast, the reflectivity product of OMI requires correction of 7-10 %, and a solar angle dependency therein is more pronounced. These corrections were inferred from a comparison with pyranometer data, and tested using the UV measurements. The average reduction of UV radiation due to clouds for all sites together indicates a small trend: a diminishing cloudiness, in line with ground-based UV observations. Uncorrected implementation of the reflectivity data would have indicated the opposite.An optimal area was established for reflectivity data for the calculation of daily sums of UV radiation. It measures approximately 1.25 • in latitudinal direction for square-shaped areas overhead the ground-based UV stations. Such an area can be traversed within 5 to 7 h at the average wind speeds found for the West European continent.

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Comparison of satellite‐derived UV irradiances with ground‐based measurements at four European stations

Cited by 52 publications

References 17 publications

Spatial and temporal UV irradiance and aerosol variability within the area of an OMI satellite pixel

Spatial and temporal UV irradiance and aerosol variability within the area of an OMI satellite pixel

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

Applying spaceborne reflectivity measurements for calculation of the solar ultraviolet radiation at ground level

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