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Volume 18, issue 6 | Copyright

Special issue: Quadrennial Ozone Symposium 2016 – Status and trends...

Atmos. Chem. Phys., 18, 3885-3902, 2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 20 Mar 2018

Research article | 20 Mar 2018

Aerosol optical depth in the European Brewer Network

Javier López-Solano1,2,3, Alberto Redondas1,3, Thomas Carlund4,5, Juan J. Rodriguez-Franco1,3, Henri Diémoz6, Sergio F. León-Luis1,3, Bentorey Hernández-Cruz2,3, Carmen Guirado-Fuentes7,1, Natalia Kouremeti4, Julian Gröbner4, Stelios Kazadzis4, Virgilio Carreño1,3, Alberto Berjón2,3, Daniel Santana-Díaz2,3, Manuel Rodríguez-Valido2,3, Veerle De Bock8, Juan R. Moreta9, John Rimmer10, Andrew R. D. Smedley10, Lamine Boulkelia11, Nis Jepsen12, Paul Eriksen12, Alkiviadis F. Bais13, Vadim Shirotov14, José M. Vilaplana15, Keith M. Wilson16, and Tomi Karppinen17 Javier López-Solano et al.
  • 1Izaña Atmospheric Research Center, Agencia Estatal de Meteorología, Tenerife, Spain
  • 2Departamento de Ingeniería Industrial, Universidad de La Laguna, Tenerife, Spain
  • 3Regional Brewer Calibration Center for Europe, Izaña Atmospheric Research Center, Tenerife, Spain
  • 4Physikalisch-Meteorologisches Observatorium Davos/World Radiation Center, Davos, Switzerland
  • 5Swedish Meteorological and Hydrological Institute, Norrköping, Sweden
  • 6Regional Agency for Environmental Protection of the Aosta Valley (ARPA), Saint-Christophe, Italy
  • 7Atmospheric Optics Group, University of Valladolid, Valladolid, Spain
  • 8Royal Meteorological Institute of Belgium, Brussels, Belgium
  • 9Agencia Estatal de Meteorología, Madrid, Spain
  • 10Centre for Atmospheric Science, University of Manchester, Manchester, UK
  • 11National Meteorological Office, Tamanrasset, Algeria
  • 12Danish Meteorological Institute, Copenhagen, Denmark
  • 13Laboratory of Atmospheric Physics, Aristotle University of Thessaloniki, Thessaloniki, Greece
  • 14Scientific and Production Association “Typhoon”, Obninsk, Russia
  • 15National Institute for Aerospace Technology – INTA, Atmospheric Observatory “El Arenosillo”, Huelva, Spain
  • 16Kipp & Zonen, Delft, the Netherlands
  • 17Finnish Meteorological Institute, Sodankyla, Finland

Abstract. Aerosols play an important role in key atmospheric processes and feature high spatial and temporal variabilities. This has motivated scientific interest in the development of networks capable of measuring aerosol properties over large geographical areas in near-real time. In this work we present and discuss results of an aerosol optical depth (AOD) algorithm applied to instruments of the European Brewer Network. This network is comprised of close to 50 Brewer spectrophotometers, mostly located in Europe and adjacent areas, although instruments operating at, for example, South America and Australia are also members. Although we only show results for instruments calibrated by the Regional Brewer Calibration Center for Europe, the implementation of the AOD algorithm described is intended to be used by the whole network in the future. Using data from the Brewer intercomparison campaigns in the years 2013 and 2015, and the period in between, plus comparisons with Cimel sun photometers and UVPFR instruments, we check the precision, stability, and uncertainty of the Brewer AOD in the ultraviolet range from 300 to 320nm. Our results show a precision better than 0.01, an uncertainty of less than 0.05, and, for well-maintained instruments, a stability similar to that of the ozone measurements. We also discuss future improvements to our algorithm with respect to the input data, their processing, and the characterization of the Brewer instruments for the measurement of AOD.

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The European Brewer Network (EUBREWNET, COST Action ES1207) is comprised of close to 50 instruments and currently provides near-real-time ozone and UV data. Aerosols also play key role in the Earth–atmosphere system and introduce a large uncertainty into our understanding of climate change. In this work we describe and validate a method to incorporate the measurement of aerosols in EUBREWNET. We find that this Brewer network can provide reliable aerosol data across Europe in the UV range.
The European Brewer Network (EUBREWNET, COST Action ES1207) is comprised of close to 50...