Póster elaborado para la 27th General Assembly of the European Geophysical Society celebrada en Niza los días 21-26 de abril de 2002The MAR Project is financed by the National R+D Plan of the Ministry of Science and Technology (National Research Program at the Antarctica) under contract REN2000-0245-C02-2

Cuevas Agulló, Emilio

Deferrari, Guillermo

Lakkala, Kaisa

Ochoa, Hector

Redondas, Alberto

Taalas, Petteri

Torres, Carlos

Yela, Margarita

English

Yela González, Margarita

Agencia Estatal de Meteorología

CORRECTION AND VALIDATION OF TOTAL OZONEDATA SERIES FROM AN ANTARCTIC MULTICHANNELFILTER RADIOMETER SOLAR UV NETWORKC. Torres (1), A. Redondas (1), E. Cuevas (1), K. Lakkala (2), P. Taalas (2), M.Yela (3), H. Ochoa (4) and G. Deferrari (5)(1) Observatorio Atmosférico de Izaña, Instituto Nacional de Meteorología, Spain (cjtorres@inm.es)(2) Finnish Meteorological Institute(3) Instituto Nacional de Técnica Aeroespacial, Spain(4) Dirección Nacional del Antártico/Instituto Antártico Argentino(5) Centro Austral de Investigaciones Científicas, ArgentinaTHE IRRADIANCE CORRECTION METHODUSING LAMP TESTS- Lamp irradiance is recorded every second during 15 minutes, after 10 minutes of lamp warming.-Averaged irradiance of last 10 minutes is calculated for each lamp.- Lamp test time series are referenced to the first lamp test performed with the three lamps (figure 3). Thisfirst test, taken as reference, corresponds to the values of the original calibration coefficients determinedusing a reference spectroradiometer (Bentham DM-150 spectrometer at the Izaña Observatory).- Ratios between lamps are used to remove outliers. Averaged ratios between lamps for every channel arecomputed. Points outside 2 SD range are removed (figure 4).- A five-order correction polynomial is calculated using the averaged ratios of the three lamps for eachchannel (figure 5). These polynomials are applied to the calibration coefficients, and then irradiance datasets are re-calculated.MAR PROJECT“Measurement of Antarctic Radiance for monitoring the ozone layer” (REN2000-0245-C02-02)Participating Institutions.-- Centro Austral de Investigaciones Científicas (CADIC, Argentina)- Dirección Nacional del Antártico/ Instituto Antártico Argentino (DNA/IAA, Argentina)Objectives.-- OStations (figure 1).-- Ushuaia (54º49’S, 68º19’W)- Marambio (64º14’S, 56º38’W)- Belgrano (77º52’S, 34º37’W)Instruments.-- 3 NILU-UV6- 3 pectrometers (”EVA”) - INTA- 1 Ozonesonde ECC (Belgrano station) - INTAFinanced by the National R+D Plan of the Ministry of Science and Technology- Instituto Nacional de Meteorología (INM, Spain)- Instituto Nacional de Técnica Aeroespacial (INTA, Spain)- Finnish Meteorological Institute (FMI, Finland)multichannel radiometers - INM- 1 Travelling reference NILU-UV6 - FMIUV-VIS (DOAS) S( )www.izana.go.to/mar/bserve and characterize the evolution in time and space of O , NO , OClO andultraviolet radiation in the Antarctic and Sub-Antarctic region- Carry out a dynamic study of the Antarctic polar vortex-Improve the QA/QC system for the NILU-UV6 Multichannel Radiometers.3 2.Fig.1SOLAR UV NETWORKNILU-UV6 Multichannel Radiometer (figure 2)- Five UV channels centered at: 305, 312, 320, 340 and 380 nm (10nm FWHM)- PAR (400-700 nm)- Stabilized t : 40 ºC- Total ozone, biological UV doses rate and cloud optical depth are obtained on a routine basisbased on Dahlback’s algorithms (Dahlback, 1996)Quality Assurance (FMI)- See Poster : ”(Lakkala et al., 2002)emperatureQuality Control (INM)- Two 100-W working lamps every 15 days and one control lamp every monthST005 Quality assurance of a solar UV network in the Antarctic”Fig.2Dec Feb Apr Jun Aug Oct Dec Feb Apr Jun Aug Oct Dec2000 - 20010.50.550.60.650.70.750.80.850.90.9511.051.11.151.21.251.3Ratio0.50.550.60.650.70.750.80.850.90.9511.051.11.151.21.251.3Lamp401Lamp402Lamp403MARAMBIO - NILU-UV6 #011Channel#1 (305 nm)Dec Feb Apr Jun Aug Oct Dec Feb Apr Jun Aug Oct Dec2000 - 20010.50.550.60.650.70.750.80.850.90.9511.051.11.151.21.251.3Ratio0.50.550.60.650.70.750.80.850.90.9511.051.11.151.21.251.3Lamp401Lamp402Lamp403MARAMBIO - NILU-UV6 #011Channel#2 (312 nm)Dec Feb Apr Jun Aug Oct Dec Feb Apr Jun Aug Oct Dec2000 - 20010.50.550.60.650.70.750.80.850.90.9511.051.11.151.21.251.3Ratio0.50.550.60.650.70.750.80.850.90.9511.051.11.151.21.251.3Lamp401Lamp402Lamp403MARAMBIO - NILU-UV6 #011Channel#3 (320 nm)Dec Feb Apr Jun Aug Oct Dec Feb Apr Jun Aug Oct Dec2000 - 20010.50.550.60.650.70.750.80.850.90.9511.051.11.151.21.251.3Ratio0.50.550.60.650.70.750.80.850.90.9511.051.11.151.21.251.3Lamp401Lamp402Lamp403MARAMBIO - NILU-UV6 #011Channel#4 (340 nm)Dec Feb Apr Jun Aug Oct Dec Feb Apr Jun Aug Oct Dec2000 - 20010.50.550.60.650.70.750.80.850.90.9511.051.11.151.21.251.3Ratio0.50.550.60.650.70.750.80.850.90.9511.051.11.151.21.251.3Lamp401Lamp402Lamp403MARAMBIO - NILU-UV6 #011Channel#5 (380 nm)Dec Feb Apr Jun Aug Oct Dec Feb Apr Jun Aug Oct Dec2000 - 20010.50.550.60.650.70.750.80.850.90.9511.051.11.151.21.251.3Ratio0.50.550.60.650.70.750.80.850.90.9511.051.11.151.21.251.3Lamp401Lamp402Lamp403MARAMBIO - NILU-UV6 #011Channel#6 (PAR)Dec Feb Apr Jun Aug Oct Dec Feb Apr Jun Aug Oct Dec2000 - 20010.50.550.60.650.70.750.80.850.90.9511.051.11.151.21.251.3Ratio0.50.550.60.650.70.750.80.850.90.9511.051.11.151.21.251.3Lamp401Lamp402Lamp403MARAMBIO - NILU-UV6 #011TemperatureNILU-UV6 #011 Lamp Tests at MarambioFig.3Dec Feb Apr Jun Aug Oct Dec Feb Apr Jun Aug Oct Dec2000 - 20010.20.40.60.811.21.41.61.82Lamp402/Lamp401Mean:1.002 * SD: 0.140.20.40.60.811.21.41.61.82MARAMBIO - NILU-UV6 #011Channel#2 (312 nm)06/03/01Dec Feb Apr Jun Aug Oct Dec Feb Apr Jun Aug Oct Dec2000 - 20010.20.40.60.811.21.41.61.82Lamp403/Lamp401Mean:1.072 * SD: 0.120.20.40.60.811.21.41.61.82MARAMBIO - NILU-UV6 #011Channel#2 (312 nm)06/03/01Dec Feb Apr Jun Aug Oct Dec Feb Apr Jun Aug Oct Dec2000 - 20010.20.40.60.811.21.41.61.82Lamp403/Lamp402Mean:1.072 * SD: 0.300.20.40.60.811.21.41.61.82MARAMBIO - NILU-UV6 #011Channel#2 (312 nm)06/03/01Ratio between lampsFig.4Dec Feb Apr Jun Aug Oct Dec Feb Apr Jun Aug Oct Dec2000 - 20010.50.550.60.650.70.750.80.850.90.9511.051.11.151.21.251.3Ratio0.50.550.60.650.70.750.80.850.90.9511.051.11.151.21.251.3Channel#3: Average LampPolynomial degree 5Channel#4: Average LampPolynomial degree 5MARAMBIO - NILU-UV6 #011Dec Feb Apr Jun Aug Oct Dec Feb Apr Jun Aug Oct Dec2000 - 20010.50.550.60.650.70.750.80.850.90.9511.051.11.151.21.251.3Ratio0.50.550.60.650.70.750.80.850.90.9511.051.11.151.21.251.3Channel#1: Average LampPolynomial degree 5Channel#2: Average LampPolynomial degree 5MARAMBIO - NILU-UV6 #011Dec Feb Apr Jun Aug Oct Dec Feb Apr Jun Aug Oct Dec2000 - 20010.50.550.60.650.70.750.80.850.90.9511.051.11.151.21.251.3Ratio0.50.550.60.650.70.750.80.850.90.9511.051.11.151.21.251.3Channel#1: Average LampPolynomial degree 5Channel#2: Average LampPolynomial degree 5USHUAIA - NILU-UV6 #012Dec Feb Apr Jun Aug Oct Dec Feb Apr Jun Aug Oct Dec2000 - 20010.50.550.60.650.70.750.80.850.90.9511.051.11.151.21.251.3Ratio0.50.550.60.650.70.750.80.850.90.9511.051.11.151.21.251.3Channel#3: Average LampPolynomial degree 5Channel#4: Average LampPolynomial degree 5USHUAIA - NILU-UV6 #012Correction PolynomialFig.5REFERENCES:- Dahlback,A., (1996):”Measurements of biologically effective UV doses, total ozone abundances, andcloud effects with multichannel, moderate bandwidth filter instruments”. , , 6514-6521.- Lakkala, K.,A. Redondas, T. Koskela, P. Taalas, C. Torres, E. Cuevas and G. Deferrari (2002): ”Qualityassurance of a solar UV network in theAntarctic”. 27th GeneralAssembly of the European GeophysicalSociety, Poster Presentation (ST005) in Session ST4.03.Appl. Opt. 35OZONE COMPARISON- The different behaviour of channel#2 (312nm) and #3 (320nm) used for the ozone calculation and thepossibility of comparisons with other reference instruments, allow us to obtain an estimation of thegoodness of the irradiance correction method.- This correction method produces a correction in the total ozone series up to 25% in some periods (seefigure 6 as example). Once total ozone is corrected the agreement with the ozone obtained with thereference instruments is quite good at each station (figures 7 and 8).- The agreement between the NILU-UV6 instrument and the reference instruments is of the same orderas the relative differences found between the reference instruments each other (figure 9). Howeversignificant total ozone differences are found when comparing with TOMS and EVAat noon zenith anglehigher than 83º. Notice that NILU-UV6 irradiance data is not cosine error corrected.CIE ERYTHEMATIC DOSE RATE COMPARISON- Preliminary comparison of CIE Erythematic dose rate with the SUV-100 spectroradiometer at theCADIC Ushuaia station provides a fairly good agreement once the irradiance correction method isapplied to the CIE dose rate calculation (figure 10).Ozone Ratio: NILU-UV6 vs Corrected NILU-UV6Fig.6Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov2000 - 20010.70.750.80.850.90.9511.051.1OzoneRatio0.70.750.80.850.90.9511.051.1NILU-UV6 #012 - UshuaiaNILU-UV6 #011 - MarambioTotal Ozone at UshuaiaFig.7Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov2000 - 200150100150200250300350400450TotalOzone(DU)Corrected NILU-UV6 #011Dobson Beck #131TOMS220 DUJan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct NovUSHUAIATotal Ozone at MarambioFig.8Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov2000 - 200150100150200250300350400450TotalOzone(DU)Corrected NILU-UV6 #011Dobson Beck #99TOMS220 DUOzonesondeJan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct NovMARAMBIODISCUSSION AND CONCLUSIONS- Regular lamp tests (almost every two weeks) performed to the NILU-UV6 instruments of the MARProject's Antarctic network show a significant instability in the instrument response that is different foreach channel and each instrument. These large changes in the instrument response through the time, thatcan reach a +/- 25%, could question, in principle, NILU-UV6 data quality.- Lamp tests provides a powerful tool to detect and correct these instrument response observed changes.Amethod is proposed to correct the irradiance data of the NILU-UV6 which provides excellent results intotal ozone and CIE Erythematic dose when comparing with reference instruments. We can conclude thatNILU-UV6 is an excellent instrument for ozone and UV monitoring if an accurate Quality Controlsystem is performed on a regular basis (at least every two weeks).- Future effort will be paid to quantify the accuracy and uncertainty of corrected data.Quality control system will be improved increasing the accuracy of the voltage and intensitymeasurements of the lamps during the lamp tests.Cosine error correction will be also introduced to improve data for high zenith angles.Ozone comparison reference instrumentsUshuaiaDobson Beck #131 Servicio MeteorológicoArgentino (GAW)TOMS NASASUV-100 (CIE) NSF/Biospherical inc.(CADIC)MarambioDobson Beck #099 Servicio MeteorológicoArgentinoUV-VIS Spectrometer(“EVA”)INTATOMS NASAOzonesonde (ECC) FMIACKNOWLEDGEMENTS:The MAR Project is financed by the National R+D Plan of the Ministry of Science and Technology(National Research Program at the Antarctica) under contract REN2000-0245-C02-2. The authorswould like to thank the TOMS team at NASA/GSFC for providing the TOMS data, the National ScienceFoundation and Biospherical Instruments Inc. for the SUV-100 spectroradiometer data at Ushuaiastation, the Servicio Meteorológico Nacional (SMN,Argentina) for kindly supplying the Dobson data atUshuaia and Marambio stations. The authors wish to express their appreciation to the operators of theMAR ProjectAntarctic network for making it possible.09:00 12:00 15:00 18:00 21:00 00:00050100150200250300USH 17−Oct−2000timeCie dose rate mW/m2cie nsfcie nilu06:00 12:00 18:00 00:00050100150200250300USH 27−Oct−2000timeCie dose rate mW/m2cie nsfcie nilu09:00 12:00 15:00 18:00 21:00 00:00050100150200250300USH 03−Oct−2001timeCie dose rate mW/m2cie nsfcie nilu06:00 12:00 18:00 00:00 06:00050100150200250300USH 01−Jan−2000timeCie dose rate mW/m2cie nsfcie niluFig.10CIE COMPARISON AT USHUAIATotal Ozone Error vs Noon SZAFig.940 45 50 55 60 65 70 75 80 85 90Noon SZA (º)-80-70-60-50-40-30-20-10010203040506070TotalOzoneError(%)TOMS (Jan., 2000 - May 2001)Dobson Beck #99 (2000 - 2001)TOMS vs Dobson Beck #99EVA (2000 - 2001)MARAMBIOCorrectedNILU-UV6 #011vsDobson, TOMS&EVA

Correction and validation of total ozone data series from an antarctic multichannel filter radiometer solar UV network

https://repositorio.aemet.es/bitstream/20.500.11765/4803/1/Poster_EGS_02_Nilu.pdf

Correction and validation of total ozone data series from an antarctic multichannel filter radiometer solar UV network

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