Póster elaborado para el Quadrennial Ozone Symposium celebrado en Edinburgh los días 4–9 de septiembre de 2016

Berjón, Alberto

Carreño Corbella, Virgilio

Hernández Cruz, Bentorey

Lakkala, Kaisa

León-Luis, Sergio F.

López-Solano, Javier

Redondas, Alberto

Santana-Díaz, Daniel

English

León-Luis, Sergio Fabián

López Solano, Javier

Agencia Estatal de Meteorología

S. F. León-Luis1, K. Lakkala2, B. Hernández-Cruz1,3, J. López-Solano1,3, V. Carreño1, A. Berjón1,3, D. Santana-Díaz1,3,  and A. Redondas11 Regional Brewer Calibration Center – Europe, Izaña Atmospheric Research Center, Agencia Estatal de Meteorología, Tenerife, Spain  2 Finnish Meteorological Institute, Rovaniemi, Finland3 Departamento de Ingeniería Industrial, Universidad de La Laguna, Tenerife, Spain; Preliminar results on the operative cosine correction in EUBREWNETIntroductionThe amount of Solar UV radiation reaching the Earth’s surface is constantly changing dueto the contribution of different factors of very different nature. On the one hand, thedistance between the Earth and the Sun is not constant but varies on annual cycle whichcan be observed analyzing the average values of UV radiation measurements. On the otherhand, the UV radiation varies daily due to the presence of external variables such asozone, aerosols or clouds, which can absorb or scatter the UV radiation [1].In addition, all the equipment used to measure the solar radiation must be corrected fortheir instrumental errors. In particular, the Brewer spectroradiometers have a non idealangular response. In this work, we show the initial results obtained when the UVmeasurement are corrected regarding the cosine error. The dataset used was collected bydifferent Brewer instruments integrated in the Eubrewnet network [2].Cosine correction in EubrewnetSummaryAcknowledgmentsThis work has been supported by the European Metrology Research Programme (EMRP) within the joint research projectENV59 “Traceability for atmospheric total column ozone” (ATMOZ). The EMRP is jointly funded by the EMRPparticipating countries within EURAMET and the European Union. We further acknowledge the support by the FundaciónGeneral de la Universidad de La Laguna.References[1] Ilias Fountoulakis, Alkiviadis F. Bais, Konstantinos Fragkos,Charickleia Meleti, Kleareti Tourpali, and Melina Maria Zempila, “Shortand long term variability of spectral solar UV irradiance at Thessaloniki,Greece: effects of changes in aerosols, total ozone and clouds”, Atmos.Chem. Phys., 16, 2493–2505, 2016. doi:10.5194/acp1624932016.[2] EUBREWNET http://rbcce.aemet.es/eubrewnet►We have developed different UV products for the European Brewer Network(EUBREWNET), COST action 1207.► All the data required for the UV calibration is available from the RBCCE intercomparisoncampaigns of the Brewer spectrophotometers.► The UV data level 1.0 is available at http://rbcce.aemet.es/eubrewnet► We are working to find the best input parameters for the LibRadtran model to be used in thecosine correction in function of the brewer station.►Once fully operational in the EUBREWNET data server, this UV product will be availablenear-real time for more than 20 Brewer stations.UV Calibration Different input parameters in the UV configuration COST is supportedby the EU FrameworkProgramme Horizon 2020IZAÑA1916 - 2016P238QOS2016-250 Upper stray light limit (nm)  Response file UVA reference file Temperature correction coefficients Reference temperature for T-correctionVisit us at EubrewnetUV plots at EubrewnetIn Eubrewnet, we are working in a setof real-time plots obtained from theUV measurements.For example, the erythema dose rates(ultraviolet index) are calculated dailyfor each Brewer station. However, wewant to introduce new plots related toother UV measurements:• Vitamin D production.       •  UVB• DNA Damage.                  • UVA  Hourly Daily Monthly YearlyDose rates Daily integralsMean of daily dosesMean of daily dosesUV indices Daily dosesSum of daily dosesSum of daily doses Slit function Spike correction Method of interpolation   T-circuit coefficient Cosine responseIn order to guarantee the validity of theUV measurements, the Brewers arecalibrated each six months with 1000Wlamps in the optical laboratory facilitiesand monthly using a portablecalibration system with 200W lamps.Moreover, the Brewer #185 iscalibrated annually in respect to thereference of the World RadiationCentre. (PMOD-WRC)UV data processing levels in EubrewnetThe upper figure shows the UV data processing from raw counts up to Level 2.0. Themeasurements were obtained during the Huelva Brewer Intercomparison Campaign 2015.The figure below shows the global correction factor obtained from the cosine correction andLibRadtran model. Actually, we are working to obtain a better agreement between theQasume and Brewer UV measurements, refining the values of other parameters (cloud, solarflux, spectral resolution, etc.) in the input file of the LibRadtran and Shicrivm models.The UV data processing in Eubrewnet has been configured in a structureof three levels. In the first one, the counts per second and the irradiance,using the UV response file, are calculated. In the second level thetemperature correction factor is applied. Finally, the cosine correctionfactor for global spectral irradiance and the correction for wavelengthshifts are introduced in the last level.

Preliminar results on the operative cosine correction in EUBREWNET

https://repositorio.aemet.es/bitstream/20.500.11765/6044/1/Poster_UV_septiembre.pdf

Preliminar results on the operative cosine correction in EUBREWNET

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