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Direct-sun Total Ozone Data from a Bentham Spectroradiometer: Methodology and Comparison with Satellite Observations : Volume 5, Issue 6 (05/11/2012)

By Antón, M.

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Book Id: WPLBN0003988494
Format Type: PDF Article :
File Size: Pages 30
Reproduction Date: 2015

Title: Direct-sun Total Ozone Data from a Bentham Spectroradiometer: Methodology and Comparison with Satellite Observations : Volume 5, Issue 6 (05/11/2012)  
Author: Antón, M.
Volume: Vol. 5, Issue 6
Language: English
Subject: Science, Atmospheric, Measurement
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2012
Publisher: Copernicus Gmbh, Göttingen, Germany

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Antón, M., Alados-Arboledas, L., Olmo, F. J., Valenzuela, A., & Román, R. (2012). Direct-sun Total Ozone Data from a Bentham Spectroradiometer: Methodology and Comparison with Satellite Observations : Volume 5, Issue 6 (05/11/2012). Retrieved from http://www.ebooklibrary.org/


Description
Description: Departamento de Física, Universidad de Extremadura, Badajoz, Spain. A methodology to obtain the total ozone column (TOC) from the direct-solar spectral measurements of a Bentham spectroradiometer located at Granada (Spain) is presented in this paper. The method relies on the differential absorption technique using two pairs of direct irradiance at adjacent wavelengths between 305 and 340 nm. The extraterrestrial constant was determined from the extrapolation to zero air mass of each wavelength pair (Langley plot method). We checked the strong influence of the cloud cover on the Bentham TOC measurements using simultaneous sky images taken with an All-sky camera. Thus, reliable TOC data are exclusively obtained during cloud-free conditions or partly cloudy conditions without the solar disk obstructed. In this work, the hourly TOC averages retrieved by the Bentham instrument with a~standard deviation smaller than 3% (~ 10 Dobson Unit) are selected as high-quality TOC data. The analysis of the diurnal TOC variations during cloud-free days showed a differential behavior between the morning and afternoon periods. Thus, while the mornings exhibit an almost stable pattern, the afternoons displays a monotonic TOC increase which could be related to photochemical processes in the lower troposphere associated with the formation of surface ozone. Finally, the Bentham TOC measurements were validated against the satellite data derived from three satellite instruments: OMI, GOME and SCIAMACHY. The mean absolute values of the relative differences between satellite and ground-based data were smaller than 3% which highlight the high reliability of the retrieval method proposed in this paper to derive TOC data.

Summary
Direct-sun total ozone data from a Bentham spectroradiometer: methodology and comparison with satellite observations

Excerpt
Adame, J. A., Bolivar, J. P., and de la Morena, B.: Surface ozone measurements in the southwest of the Iberian Peninsula (Huelva, Spain), Environ Sci. Pollut. R., 17, 355–368, 2010.; Antón, M., Loyola, D., Navascúes, B., and Valks, P.: Comparison of GOME total ozone data with ground data from the Spanish Brewer spectroradiometers, Ann. Geophys., 26, 401–412, doi:10.5194/angeo-26-401-2008, 2008.; Antón, M., López, M., Costa, M. J., Serrano, A., Bortoli, D., Bañón, M., Vilaplana, J. M., and Silva, A. M.: Influence of the ozone profile above Madrid (Spain) on Brewer estimation of ozone air mass factor, Ann. Geophys., 27, 3179–3183, 2009.; Antón, M., Koukouli, M. E., Kroon, M., McPeters, R. D., Labow, G. J., Balis, D., and Serrano, A.: Global validation of empirically corrected EP-TOMS total ozone columns using Brewer and Dobson groun-based measurements, J. Geophys. Res., 115, D19305, doi:10.1029/2010JD014178, 2010a.; Antón, M., López, M., Serrano, A., Bañón, M., and Garc\'{i}a, J. A.: Diurnal variability of total ozone column over Madrid (Spain), Atmos. Environ., 44, 2793–2798, doi:10.1016/j.atmosenv.2010.05.004, 2010b.; Antón, M., Kroon, M., López, M., Vilaplana, J. M., Bañón, M., van der A, R., Veefkind, J. P., Stammes, P., and Alados-Arboledas, L.: Total ozone column derived from GOME and SCIAMACHY using KNMI retrieval algorithms: validation against Brewer measurements at the Iberian Peninsula, J. Geophys. Res., 116, D22303, doi:10.1029/2011JD016436, 2011.; Arola, A. and Koskela, T.: On the sources of bias in aerosol optical depth retrieval in the UV range, J. Geophys. Res., 109, D08209, doi:10.1029/2003JD004375, 2004.; Balis, D., Kroon, M., Koukouli, M. E., Brinksma, E. J., Labow, G., Veefkind, J. P., and McPeters, R. D.: Validation of ozone monitoring instrument total ozone column measurements using Brewer and Dobson spectrophotometer ground-based observations, J. Geophys. Res., 112, D24S46, doi:10.1029/2007JD008796, 2007.; Basher, R. E.: Review of the Dobson spectrophotometer and its accuracy, Global Ozone Res. Monit. Proj. Rep. 13, World Meteorol. Org., Geneva, Switzerland, 1982.; Bass, A. M. and Paur, R. J.: The ultraviolet cross-sections of ozone, in: Atmospheric Ozone: Proceedings of the Quadrennial Ozone Symposium, edited by: Zerefos, C. S. and Ghazi, A., 606–616, 1985.; Bernhard, G. and Seckmeyer, G.: Uncertainty of measurements of spectral solar UV irradiance, J. Geophys. Res., 104, 14321–14346, 1999.; Bernhard, G., Evans, R. D., Labow, G. J., and Oltmans, S. J.: Bias in Dobson total ozone measurements at high latitudes due to approximations in calculations of ozone absorption coefficients and air mass, J. Geophys. Res., 110, D10305, doi:10.1029/2004JD005559, 2005.; Bhartia, P. K. and Wellemeyer, C.: TOMS-V8 total O3 algorithm, in: OMI Algorithm Theoretical

 

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