Intercomparison of aerosol optical depth from Brewer ozone spectrophotometers  and CIMEL sunphotometers measurements

Cheymol, A.; Sotelino, L. Gonzalez; Lam, Ka Se; Kim, J.; Fioletov, Vitali; Backer, H. De; Siani, A. M.

doi:10.5194/acpd-8-11997-2008

Cited by 7 publications

(6 citation statements)

References 32 publications

(28 reference statements)

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“…Aerosol optical depth data are further complemented by UV‐B AOD data (320 nm) derived from Brewer spectrophotometers. The Brewer UV‐B AOD data were evaluated with data from colocated Sun photometers of the AERONET network [ Cheymol et al , 2009].…”

Section: Observational Data For Evaluationmentioning

confidence: 99%

Aerosol analysis and forecast in the European Centre for Medium-Range Weather Forecasts Integrated Forecast System: 3. Evaluation by means of case studies

et al. 2011

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[1] A near real-time system for assimilation and forecasts of aerosols, greenhouse and trace gases, extending the ECMWF Integrated Forecasting System (IFS), has been developed in the framework of the Global and regional Earth-system Monitoring using Satellite and in-situ data (GEMS) project. The GEMS aerosol modeling system is novel as it is the first aerosol model fully coupled to a numerical weather prediction model with data assimilation. A reanalysis of the period [2003][2004][2005][2006][2007][2008][2009] has been carried out with the same system. During its development phase, the aerosol system was first run for the time period January 2003 to December 2004 and included sea salt, desert dust, organic matter, black carbon, and sulfate aerosols. In the analysis, Moderate Resolution Imaging Spectroradiometer (MODIS) total aerosol optical depth (AOD) at 550 nm over ocean and land (except over bright surfaces) was assimilated. This work evaluates the performance of the aerosol system by means of case studies. The case studies include (1) the summer heat wave in Europe in August 2003, characterized by forest fire aerosol and conditions of high temperatures and stagnation, favoring photochemistry and secondary aerosol formation, (2) a large Saharan dust event in March 2004, and (3) periods of high and low sea salt aerosol production. During the heat wave period in 2003, the linear correlation coefficients between modeled and observed AOD (550 nm) and between modeled and observed PM2.5 mass concentrations are 0.82 and 0.71, respectively, for all investigated sites together. The AOD is slightly and the PM2.5 mass concentration is clearly overestimated by the aerosol model during this period. The simulated sulfate mass concentration is significantly correlated with observations but is distinctly overestimated. The horizontal and vertical locations of the main features of the aerosol distribution during the Saharan dust outbreak are generally well captured, as well as the timing of the AOD peaks. The aerosol model simulates winter sea salt AOD reasonably well, however, showing a general overestimation. Summer sea salt events show a better agreement. Overall, the assimilation of MODIS AOD data improves the subsequent aerosol predictions when compared with observations, in particular concerning the correlation and AOD peak values. The assimilation is less effective in correcting a positive (PM2.5, sulfate mass concentration, Angström exponent) or negative (desert dust plume AOD) model bias.Citation: Mangold, A., et al. (2011), Aerosol analysis and forecast in the European Centre for Medium-Range Weather Forecasts Integrated Forecast System: 3. Evaluation by means of case studies,

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Section: Observational Data For Evaluationmentioning

confidence: 99%

Aerosol analysis and forecast in the European Centre for Medium-Range Weather Forecasts Integrated Forecast System: 3. Evaluation by means of case studies

et al. 2011

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“…The retrieval of the optical parameters is an important issue of the atmospheric research community (Cheymol et al, 2009). Reuder and Schwander (1999) found that the Single Scattering Albedo, SSA (i.e.…”

Section: Introductionmentioning

confidence: 99%

Aerosol Single Scattering Albedo retrieval in the UV range: an application to OMI satellite validation

et al. 2010

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Abstract. The aerosol Single Scattering Albedo (SSA) and Absorbing Aerosol Optical Depth (AAOD) at 320.1 nm are derived at Rome site by the comparison between Brewer and modelled spectra. The UVSPEC radiative transfer model is used to calculate the UV irradiances for different SSA values, taking into account as input data total ozone and Aerosol Optical Depth (AOD) obtained from Brewer spectral measurements. The accuracy in determining SSA depends on the aerosol amount and on Solar Zenith Angle (SZA) value: SSA uncertainty increases when AOD and SZA decrease. AAOD retrievals are also used to quantify the error in the Ozone Monitoring Instrument (OMI) surface UV products due to absorbing aerosols, not included in the current OMI UV algorithm. OMI and Brewer UV irradiances at 324.1 nm and Erythemal Dose Rates (EDRs) under clear sky conditions, are compared as a function of AAOD. Three methods are considered to investigate on the applicability of an absorbing aerosol correction on OMI UV data at Rome site. Depending on the correction methodology, the bias value decreases from 18% to 2% for spectral irradiance at 324.1 nm and from 25% to 8% for EDR.

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“…For example, 340 and 380 nm is used in the sunphotometer or skyradiometer and even shorter channel 320.1 nm can be used for AOD retrieval in the Brewer spectrophotometer (Kerr, 2002). Several studies verified the quality of AOD measured in these UV-channels by the inter-comparison among different instruments (Cheymol et al, 2009;De Bock et al, 2010). For this study, AOD from UV channel measurements of skyradiometer was also verified with the data measured in the 320.1 nm of Brewer spectrophotometer located in the same site (Koo, 2008).…”

Section: Data Descriptionmentioning

confidence: 98%

Wavelength dependence of Ångström exponent and single scattering albedo observed by skyradiometer in Seoul, Korea

Koo

Kim

Lee

et al. 2016

Atmospheric Research

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Intercomparison of aerosol optical depth from Brewer ozone spectrophotometers and CIMEL sunphotometers measurements

Cited by 7 publications

References 32 publications

Aerosol analysis and forecast in the European Centre for Medium-Range Weather Forecasts Integrated Forecast System: 3. Evaluation by means of case studies

Aerosol analysis and forecast in the European Centre for Medium-Range Weather Forecasts Integrated Forecast System: 3. Evaluation by means of case studies

Aerosol Single Scattering Albedo retrieval in the UV range: an application to OMI satellite validation

Wavelength dependence of Ångström exponent and single scattering albedo observed by skyradiometer in Seoul, Korea

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