Surface UV radiation monitoring based on GOME and SCIAMACHY Jos van Geffen 1,2, Ronald van de A 1, Michiel van Weele 1, Marc Allaart 1, Henk Eskes 1 1)

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Presentation transcript:

Surface UV radiation monitoring based on GOME and SCIAMACHY Jos van Geffen 1,2, Ronald van de A 1, Michiel van Weele 1, Marc Allaart 1, Henk Eskes 1 1) KNMI, De Bilt, The Netherlands 2) now at: BIRA-IASB, Brussels, Belgium Tropospheric Emission Monitoring Internet Service (ESA-DUP project)

Contents UV radiation monitoring UV index and UV dose and implementation in the TEMIS algorithm Preliminary validation of the UV dose TEMIS data service Conclusions & Outlook

UV radiation UV-A: nm UV-B: nm UV-C: nm Absorption by ozone and oxygen in atmosphere is wavelength dependent. UV irradiance at surface: UV-A: 94% UV-B: 6% UV-C: 0% Biological effects of UV are wavelength dependent ===> important to monitor UV radiation

Action spectra Relative wavelength dependency of biological effects Erythema: 280 – 400 nm DNA-damage: 256 – 370 nm Erythemal UV irradiance at the surface: UV-A: 17% UV-B: 83%

UV index Integration of UV irradiance weighted with an action spectrum gives the dimensionless UV index: a measure for the effective UV irradiance reaching the surface at a given moment. Parametrisation by Allaart et al. (2003) of the erythemal UV index: UVI = UVI(TOC,SZA) TOC = total ozone column in Dobson Units SZA = solar zenith angle in degrees based on groundbased measurements at De Bilt and Paramaribo. Similar parametrisation made for the DNA-damage UV index.

Clear-sky UV index at local solar noon Total ozone column data from GOME and SCIAMACHY is assimilated in a chemistry transport model, which is driven by ECMWF forecast meteorology, provides global ozone field data at local solar noon. ===> Clear-sky UV index at local solar noon – global field TEMIS algorithm contains corrections for: ground elevation surface albedo varying Earth-Sun distance (Correction for aerosols is preliminary.)

Daily UV dose UVD = ∫ UVI(TOC,SZA(t)) ∙ A(t) ∙ dt [kJ/m²] Cloud info from: METEOSAT Europe daily 1-hourly ► yesterdays dose ISCCP database world-wide monthly average 3-hourly ► monthly average dose

Validation of daily erythemal UV dose for Europe Preliminary validation using groundbased UV measurements in the EDUCE database, which provides the erythemal UV dose rate (in J/m²s) via the BASINT tool. TEMIS algorithm, using METEOSAT cloud cover information, performs the integration by way of summing 10-minute intervals. Hence, for comparison the EDUCE/BASINT dose rate is integrated over 10 minutes for each measurement. EDUCE = European Database for UV Climatology and Evaluation (

Validation of daily erythemal UV dose for Europe METEOSAT: (almost) completely cloud-free day at Lampedusa Daily dose in kJ/m²: TEMIS = 4.86 BASINT = 4.83 Clear-sky = 4.86 Overcast = 2.43 Lampedusa data: thanks to Alcide di Sarra

Validation of daily erythemal UV dose for Europe METEOSAT: (almost) completely cloud-free day at Lampedusa Daily dose in kJ/m²: TEMIS = 4.84 BASINT = 5.31 Clear-sky = 4.85 Overcast = 2.42 Lampedusa data: thanks to Alcide di Sarra

Validation of daily erythemal UV dose for Europe METEOSAT: (almost) completely cloud-free day at Thessaloniki Daily dose in kJ/m²: TEMIS = 5.32 BASINT = 4.82 Clear-sky = 5.38 Overcast = 2.69 Thessaloniki data: thanks to Alkis Bais

Validation of daily erythemal UV dose for Europe METEOSAT: almost fully clouded day at Thessaloniki Daily dose in kJ/m²: TEMIS = 2.81 BASINT = 3.55 Clear-sky = 5.21 Overcast = 2.61 Thessaloniki data: thanks to Alkis Bais

TEMIS data service – GOME For both the erythemal and the DNA-damage data products.

TEMIS data service – SCIA SCIAMACHY near-real time service: Clear-sky erythemal UV index at local solar noon, a forecast for today and for a few days ahead. Daily erythemal UV dose for Europe, using the 1-hourly METEOSAT cloud cover information, for yesterday. SCIAMACHY data archive: Daily erythemal UV dose for Europe: Jan to present. Starting the data archive in Jan requires ozone column data starting in Dec But data for Dec and Jan is not complete yet: this awaits (re)processing by ESA.

Conclusions As a support to UV radiation monitoring, TEMIS provides the erythemal and DNA-damage UV index and UV dose. For the GOME period (Aug – May 2003) in the form of a data archive, with monthly averages, climatologies, etc. Based on SCIAMACHY observations, there is an operational near- real time forecast of the erythemal UV index world wide, and for Europe the erythemal UV dose. A preliminary validation of the erythemal UV dose shows good agreement between the TEMIS algorithm and groundbased UV measurements in the EDUCE database.

Outlook Maintenance of the GOME data archive. Continuation of the SCIAMACHY near-real time service. Setting up data archive for SCIAMACHY, in the same manner as the GOME data archive. Implement an improved aerosol correction in the TEMIS algorithm. A more detailed validation of the erythemal UV dose. Implement the use of cloud cover information from Meteosat Second Generation (MSG) satellites for the UV dose. Investigate whether UV index and UV dose can be given separately for UV-A and UV-B. Possibly apply more action spectra.