Presentación realizada en: Quadrennial Ozone Symposium, celebrado en Edimburgo del 4 al 9 de septiembre de 2016

Berjón, Alberto

Carlund, Thomas

Carreño Corbella, Virgilio

Hernández Cruz, Bentorey

León-Luis, Sergio F.

López-Solano, Javier

Redondas, Alberto

Rodríguez Valido, M.

English

López Solano, Javier

León-Luis, Sergio Fabián

Rodríguez Valido, Manuel

Agencia Estatal de Meteorología

Javier López-Solano, Thomas Carlund, Bentorey Hernández, Sergio F. León-Luis, Virgilio Carreño, Alberto Berjón, Manuel Rodríguez Valido, and Alberto RedondasRegional Brewer Calibration Center (Izaña Atmospheric Research Center, AEMET), Dpto. Ingeniería Industrial (Universidad de La Laguna), and PMOD/World Radiation CenterAerosol Optical Depthwww.aemet.es 2AODIntroductionWithin the ESA IDEAS+ project, at the RBCCE we have been working on the development of an AOD productAlthough we are still on the early stages, we expect to integrate this product in EUBREWNET’s server soonIn this talk, we provide a brief description of our calculation method and compare our first results with the UVPFR operated by  the PMOD/WDC at the XRBBCE “El Arenosillo 2015” campaign, and with selected CIMEL instruments from AERONET2016/05/19www.aemet.es 3AODThe Beer-Lambert-Bouguer equationAttenuation of solar radiation by the Earth’s atmosphere:In the UV range, and ignoring the SO2 contribution, 2016/05/19f=f0e−τmτm=τomo+ τR mR+τamaozone      Rayleigh     aerosolswww.aemet.es 4AOD equation for Brewer spectrophotometers2016/05/19AODτa=1mR{ log f0−log f−Do ko log101000 mo− p1013 kR log 1010000 mR} ozone              RayleighBrewercountsCalibration constantma≈mRSee my talk on the AOD configuration for more details See my talk on the AOD configuration for more details For each wavelength:www.aemet.es 5Calibration by Langley plots2016/05/19AODlog f=−τm+ log f0Beer-Lambert-Bouguer equation:Stable atmospheric conditions: Plot          vs      Linear regression: After T. Carlund’s STSM: τ=constantlog f m≈mointercept=log f0log f+τRmR=−~τmo+ log f0www.aemet.es 6Calibration by Langley plots (2)2016/05/19AODOne regression for each wavelength (colors in the plot) and filter (symbols, just two in the  plot)One calibration constant f0 for each wavelength and each filter www.aemet.es 7Calibration by Langley plots (3)2016/05/19AODLangley calibration of Brewer #185: ~2 months of data, with two Langley plots per day (morning and afternoon)Only include data with ozone optical mass between 1.1 and 3.5Discard Langley plots with a low-quality linear regression: r2<0.9985Calculate the median of the f0 of each LangleyDiscard f0 values above/below 2% from the medianFinal f0 = mean of the f0 of each Langleywww.aemet.es 8Calibration by transfer2016/05/19AODDon’t have stable atmospheric conditions, butdo have simultaneous observations with a reference instrument:log f0=τaref mR+ log f+Doko log 101000mo+p1013kR log 1010000mRBrewer being calibratedReference instrumentwww.aemet.es 9Calibration by transfer (2)2016/05/19AODCalibration of Brewer #163 by transfer from Brewer #185:“Good” days of the X RBCCE campaign at El Arenosillo, May-June 2015Simultaneous observations = within 1 minOne f0 for each simultaneous observationFinal f0 = mean of the f0 of each observationwww.aemet.es 10Calibration by transfer (3)2016/05/19AODCalibration of Brewer #163 by transfer from Brewer #185: X: #163O: #185www.aemet.es 11Calibration by transfer (4)AODCalibration of Brewer #163 by transfer from Brewer #185: WMO limit: 0.005+0.01/mo2016/05/19% of observations within the WMO limit at each wavelenght306.3 nm : 66.2%310.1 nm : 80.3%313.5 nm : 83.5%316.8 nm : 86.3%320.1 nm : 87.3%WMO traceability limit : 95%www.aemet.es 12XRBCCE “El Arenosillo 2015”: Brewer vs. PFR 2016/05/19AOD316.8nmwww.aemet.es 13XRBCCE “El Arenosillo 2015”: Brewer vs. PFR (2) 2016/05/19AOD316.8nmwww.aemet.es 14XRBCCE “El Arenosillo 2015”: Brewer vs. PFR (3) 2016/05/19AODBrewer ID No. obs. Lin. Reg. slope Lin. Reg. intercept Lin. Reg. r2 Pearson’s corr. % within WMO005 700 0.975 0.005 0.980 0.990 74.0044 773 0.982 0.006 0.969 0.984 52.3075 1402 0.999 -0.008 0.946 0.973 34.8126 1544 0.964 0.003 0.977 0.988 69.4150 695 0.933 0.018 0.946 0.973 60.6158 610 1.017 -0.009 0.980 0.990 80.0163 1642 0.982 -0.002 0.989 0.994 83.4172 965 0.972 0.001 0.977 0.989 71.4185 2073 0.920 0.019 0.972 0.986 66.4202 946 0.969 0.005 0.986 0.993 85.9214 670 0.977 0.003 0.987 0.994 79.0228 631 0.976 0.002 0.972 0.986 67.6www.aemet.es 15XRBCCE “El Arenosillo 2015”: Brewer vs. PFR (4) 2016/05/19AODBrewer ID No. obs. Lin. Reg. slope Lin. Reg. intercept Lin. Reg. r2 Pearson’s corr. % within WMO005 700 0.975 0.005 0.980 0.990 74.0044 773 0.982 0.006 0.969 0.984 52.3075 1402 0.999 -0.008 0.946 0.973 34.8126 1544 0.964 0.003 0.977 0.988 69.4150 695 0.933 0.018 0.946 0.973 60.6158 610 1.017 -0.009 0.980 0.990 80.0163 1642 0.982 -0.002 0.989 0.994 83.4172 965 0.972 0.001 0.977 0.989 71.4185 2073 0.920 0.019 0.972 0.986 66.4202 946 0.969 0.005 0.986 0.993 85.9214 670 0.977 0.003 0.987 0.994 79.0228 631 0.976 0.002 0.972 0.986 67.6Mean 1054 0.972 0. 03 0.972 0.986 67.5www.aemet.es 16April-May 2015: Brewer #185 vs. CIMEL 2016/05/19AODCIMEL from 340nm to 320nm using the 340-440nm Ångström exponent •: outliersSimultaneous obs. (30 min) : 1256Linear regress. slope :  0.963Linear regress. intercept : 0.011Linear regress. r2 : 0.989Pearson’s correlation : 0.994Obs. within WMO limit : 61.0%www.aemet.es 17June-December 2015: Brewer #163 vs. CIMEL 2016/05/19AOD•: outliersSimultaneous obs. (30 min) : 1203Linear regress. slope :  0.993Linear regress. intercept : 0.007Linear regress. r2 : 0.970Pearson’s correlation : 0.985Obs. within WMO limit : 68.7%CIMEL from 340nm to 320nm using the 340-440nm Ångström exponent www.aemet.es 18June-December 2015: Brewer #214 vs. CIMEL 2016/05/19AOD•: outliersSimultaneous obs. (30 min) : 366Linear regress. slope :  1.019Linear regress. intercept : 0.016Linear regress. r2 : 0.937Pearson’s correlation : 0.968Obs. within WMO limit : 29.5%CIMEL from 340nm to 320nm using the 340-440nm Ångström exponent www.aemet.es 19Closing remarks2016/05/19AODOur preliminary AOD results are in reasonable agreement with the UVPFR and CIMEL dataSee my next talk on the AOD configuration for further details on the corrections and parameters usedStill in development, all suggestions are welcome!Brewer operators should check the configurations at EUBREWNET’s serverwww.aemet.es 20April-May 2015: Brewer #185 vs. CIMEL 2016/05/19AODX: #185O: CIMEL•: outliersCIMEL from 340nm to 320nm using the 340-440nm Ångström exponent www.aemet.es 21June-December 2015: Brewer #163 vs. CIMEL 2016/05/19AODX: #163O: CIMEL•: outliersCIMEL from 340nm to 320nm using the 340-440nm Ångström exponent www.aemet.es 22Calibration by transfer (4)2016/05/19AODCalibration of Brewer #163 by transfer from Brewer #185: WMO limit: 0.005+0.01/mo

Aerosol Optical Depth

https://repositorio.aemet.es/bitstream/20.500.11765/11643/1/05_aod_azores.pdf

Aerosol Optical Depth

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