Póster elaborado para la 27th General Assembly of the European Geophysical Society celebrada en Niza los días 21-26 de abril de 200

Cuevas Agulló, Emilio

Deferrari, Guillermo

Koskela, T.

Lakkala, Kaisa

Redondas, Alberto

Taalas, Petteri

Torres, Carlos

English

Koskela, Tapani

Agencia Estatal de Meteorología

QUALITY ASSURANCE OF A SOLAR UV NETWORK IN THE ANTARCTICK. Lakkala, A. Redondas, T. Koskela, P. Taalas, C. Torres, E. Cuevas and G. Deferrari(1) Finnish Meteorological Institute(2) Observatorio Atmosfe´rico de Izan˜a Instituto Nacional de Meteorologi`a, Spain(3) Centro Austral De Investigationes Cientificas, Argentina kaisa.lakkala@fmi.fiMAR-Project (Measurement of AntarcticRadiance for monitoring the ozone layer)General goals:Promote observations and research ofstratospheric ozone, UV radiation and relatedphysical parameters in the Antarctic region.Determine the variations in ozone concentration,spectral UV radiation and photosynthetic activeradiation. Improve the knowledge of the meteorologicaland chemical mechanisms that determine theAntarctic atmosphere throughout the winter andits features in summer.Cooperation between: INM Instituto Nacional de Meteorologi`a (Spain)Quality control of the network.Official data delivery to the internationalscientific community.FMI Finnish Meteorological InstituteQuality assurance of the network.CADIC Centro Austral de InvestigacionesCientificas (Argentina)Operation of the instruments and data transfer.DNA-IAA Dirrection Nacional delAnta´rtico-Instituto Anta´rtico ArgentinoOperation of the instruments and data transfer.StationsBelgrano II: 77Æ52S 34Æ37WMarambio: 64Æ14S 56Æ37WUshuaia: 54Æ48S 68Æ19WPossibility to study the impact of the daily changesof the polar vortex on ozone and UV radiationreaching the ground.ReferencesDahlback A., B. Johnsen, B.A.K Hoiskar, K. Lakkalaand U. Wester, 2002: Intercomparison of 5multi-channel filter radiometers. Measurements ofUV-doses, total ozone abundances and cloudeffects. Manuscript to be included in the final report ofthe NOGIC2000 -intercomparison held in Tylo¨sand,Sweden.Ylianttila, L., U. Wester, L.E. Paulsson and H.Slaper, 2002: UV dose rates measured withbroadband, multichannel and spectralinstruments.Manuscript to be included in the finalreport of the NOGIC2000 -intercomparison held inTylo¨sand, Sweden.AcknowledgmentsWe thank Biospherical Instruments for co-operationand for providing the spectroradiometer data ofUshuaia. We thank Arne Dahlback for the softwareand help in data processing.INSTRUMENTSNILU-UV multichannel radiometer 5 channels measuring UV radiation center wavelengths at around:302 nm, 312 nm, 320 nm, 340 nm, 380 nm bandwidths around 10 nm at FWHM 1 channel for photosynthetic active radiation(PAR): 400–700 nmUsh. Mar.Quality control of the NILU-UV ofMarambio and UshuaiaStability: Lamp measurements every secondweekCorrection of observed drift See poster of Torres et al. in ST010.Quality assurance of the networkTraveling reference NILU-UV: Transfer ofthe irradiance absolute scale from the referencespectroradiometer.Solar comparisonsStability of the reference NILU-UVLamp tests: Before and after each solarcomparisonDrift observed in channel n.5Travelling REFLamp #1Lamp #2Lamp #300 01 02 020.70.80.911.11.2channel 100 01 02 020.70.80.911.11.2channel 200 01 02 020.70.80.911.11.2channel 300 01 02 020.70.80.911.11.2channel 400 01 02 020.70.80.911.11.2channel 500 01 02 020.70.80.911.11.2channel 600 01 02 0240424446temperatureyearFigure 2. Traveling reference lamp tests.Absolute irradiance scaleBentham double monochromatorcalibration,Izan˜a August 1999.Nordic Ozone and UV group intercomparisoncampaign (NOGIC) in 2000, Tylo¨sand Sweden.Ylianttila et al. 2002  (REFnog/NILU-UV1.02)Dahlback et al. 2002  diff. from ref.Bentham(-0.53.1 %) Solar comparisons with SUV-100spectroradiometer in Ushuaia.Date SZA SUV/NILU-UV1.12.99 34.4 0.8915.2.00 43.3 0.966.5.00 74.8 1.0527.10.00 43.0 0.949.2.01 51.9 0.9818.5.01 74.9 1.0517.10.01 45.7 0.9809:36 14:24 19:12 00:00020406080100120140160180200CIE,mW/m2HH:MM UTC15.02.2000 at Ushuaiaref−NILU−UVSUV−10030 40 50 60 70 80 900.80.911.11.21.31.41.51.61.71.8SUV/NILU−UVSZA15.02.2000 at Ushuaia Solar comparisons with Brewerspectrophotometers of FMI.Date SZA REF/NILU-UV22.10.99 78.9 1.0310.6.00 34.3 0.9810.6.00 37.9 0.9916.6.01 37.7 1.0015.8.01 53.4 1.0500:00 04:48 09:36 14:24 19:12050100150CIE,mW/m2HH:MM UTC16.6.2001 at Jokioinenref−NILU−UVBrewer30 40 50 60 70 80 900.80.911.11.21.31.41.51.6Brewer/NILU−UVSZA16.6.2001 at JokioinenSolar comparisons in Marambio andUshuaiaReference NILU-UV stable within %Calibration factors for Marambio and Ushuaia (1)where is the CIE-weighted dose rate of thereference NILU-UV and is the correspondingUV dose rate of the site  NILU-UV.Oct99 Jan00 Apr00 Aug00 Nov00 Feb01 May01 Sep01 Dec010.911.11.2Ref/MarCIE−CF for Marambio NILU−UVOct99 Jan00 Apr00 Aug00 Nov00 Feb01 May01 Sep01 Dec010.911.11.2Ref/UshCIE−CF for Ushuaia NILU−UVFigure 5. Calibration factors at each solarcomparison and linear interpolation between them.Corrected CIE UV dose ratesUV-index time series in Marambio andUshuaia 2000–2001Jan00 Apr00 Aug00 Nov00 Feb01 May01 Sep01 Dec01024681012max UV−indexMarambioJan00 Jan01 Jan02024681012Ushuaiamax UV−indexFigure 6. Daily maximum of half hour average UVindex in Marambio and Ushuaia.

Quality assurance of a solar UV network in the Antarctic

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Quality assurance of a solar UV network in the Antarctic

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