&lt;title&gt;Version 2 TOMS UV algorithm: problems and enhancements&lt;/title&gt;

Krotkov, Nickolay A.; Herman, J. R.; Bhartia, P. K.; Seftor, C. J.; Arola, Antti; Kaurola, Jussi; Koskinen, Lasse; Kalliskota, S.; Taalas, P.; Geogdzhaev, Igor V.

doi:10.1117/12.452956

Cited by 21 publications

(44 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The surface albedo used by the OMI surface UV algorithm is a climatological one, and likely it was lower than the actual effective surface albedo at least during the validation campaign. Past studies have also revealed this underestimation of the surface UV provided by TOMS data (Kalliskota et al, 2000;Krotkov et al, 2001Krotkov et al, , 2002.…”

Section: Erythemal Dose Ratementioning

confidence: 99%

“…The algorithm used to estimate the UV radiation reaching the Earth's surface is similar to the algorithm used to retrieve UV from the TOMS data (Herman et al, 1999;Krotkov et al, 2002). This OMI surface UV algorithm is based on the use of a radiative transfer model using the OMI-derived total ozone and cloud information as input parameters for modelling.…”

Section: Omi Surface Uv Datamentioning

confidence: 99%

See 1 more Smart Citation

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

et al. 2008

View full text Add to dashboard Cite

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.

show abstract

Section: Erythemal Dose Ratementioning

confidence: 99%

Section: Omi Surface Uv Datamentioning

confidence: 99%

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

et al. 2008

View full text Add to dashboard Cite

show abstract

“…Next, the clear-sky irradiance is multiplied by a factor that accounts for the attenuation of UV radiation by clouds and nonabsorbing aerosols. The current algorithm (Krotkov et al, 1998(Krotkov et al, , 2001(Krotkov et al, , 2002 does not account for absorbing aerosols (e.g. organic carbon, smoke, and dust) or trace gases (e.g., NO 2 , SO 2 ), which are known to lead to systematic overestimation of the surface UV irradiance (Chubarova, 2004;Arola et al, 2009) and neglects the cirrus effect on UV radiation.…”

Section: Aura/omimentioning

confidence: 99%

Validity of satellite measurements used for the monitoring of UV radiation risk on health

et al. 2011

View full text Add to dashboard Cite

Abstract. In order to test the validity of ultraviolet index (UVI) satellite products and UVI model simulations for general public information, intercomparison involving three satellite instruments (SCIAMACHY, OMI and GOME-2), the Chemistry and Transport Model, Modélisation de la Chimie Atmosphérique Grande Echelle (MOCAGE), and ground-based instruments was performed in 2008 and 2009. The intercomparison highlighted a systematic high bias of ∼1 UVI in the OMI clear-sky products compared to the SCIAMACHY and TUV model clear-sky products. The OMI and GOME-2 all-sky products are close to the groundbased observations with a low 6 % positive bias, comparable to the results found during the satellite validation campaigns. This result shows that OMI and GOME-2 all-sky products are well appropriate to evaluate the UV-risk on health. The study has pointed out the difficulty to take into account either in the retrieval algorithms or in the models, the large spatial and temporal cloud modification effect on UV radiation. This factor is crucial to provide good quality UV information. OMI and GOME-2 show a realistic UV variability as a function of the cloud cover. Nevertheless these satellite products do not sufficiently take into account the radiation reCorrespondence to: F. Jégou (fabrice.jegou@orleans.cnrs.fr) flected by clouds. MOCAGE numerical forecasts show good results during periods with low cloud covers, but are actually not adequate for overcast conditions; this is why Météo-France currently uses human-expertised cloudiness (rather than direct outputs from Numerical Prediction Models) together with MOCAGE clear-sky UV indices for its operational forecasts. From now on, the UV monitoring could be done using free satellite products (OMI, GOME-2) and operational forecast for general public by using modelling, as long as cloud forecasts and the parametrisation of the impact of cloudiness on UV radiation are adequate.

show abstract

“…According to the last OMI UVB Algorithm Documents 60 and confirmed by several authors [61][62][63] , OMI underestimates the values of the irradiance when there is a snow cover, because of the climatological surface albedo used by the OMI surface UV algorithm, which leads to overestimation of cloudiness 61 .…”

Section: >Table1mentioning

confidence: 99%

Erythemal ultraviolet solar radiation doses received by young skiers

Serrano

Cañada

Moreno

2013

Photochem Photobiol Sci

View full text Add to dashboard Cite

Cañada, J.; Moreno, J. (2013). Erythemal ultraviolet solar radiation doses received by young skiers. Photochemical & Photobiological Sciences. 12(11):1976-1983. doi:10.1039/c3pp50154j. ♦Professor Dr. Javier Cañada passed away in January when the study was finished. Erythemal Ultraviolet Solar Radiation Doses Received by Young SkiersMaría-Antonia Serrano The purpose of this study is to quantify UV exposure of young skiers in their training or recreational schedules, using VioSpor personal dosimeters and the results indicated that this group is exposed to UV radiation levels that can potentially cause skin damage and erythema and increase the risk of skin cancer in later life. . 2 AbstractChildren are a special group since the epidemiological evidence indicates that excessive exposure to sunlight at an early age increases the risk of skin cancer in later life. The purpose of this study is to quantify children's UV exposure when skiing, using dosimeters (VioSpor) placed on the shoulders of 10 participants. The children received a median daily Standard Erythema Dose of 2.1 within a range of 4.9-0.71, this being approximately 35% of the calculated 24 h ambient UV radiation on the horizontal plane.According to the results obtained, young skiers are exposed to UV radiation that can potentially cause skin damage and erythema and increase the risk of skin cancer in the course of a lifetime. These findings emphasise the need for adequate protective measures against solar radiation when skiing. The results also suggest that sunprotection campaigns should be undertaken aimed at children engaged in outdoor sports, including winter activities.

show abstract

<title>Version 2 TOMS UV algorithm: problems and enhancements</title>

Cited by 21 publications

References 0 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

Validity of satellite measurements used for the monitoring of UV radiation risk on health

Erythemal ultraviolet solar radiation doses received by young skiers

Contact Info

Product

Resources

About