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Journal Articles Atmospheric Chemistry and Physics Year : 2018

Results from the Fourth WMO Filter Radiometer Comparison for aerosol optical depth measurements

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1
Stelios Kazadzis
Natalia Kouremeti
  • Function : Author
Henri Diémoz
  • Function : Author
Julian Gröbner
  • Function : Author
Bruce W. Forgan
  • Function : Author
Monica Campanelli
  • Function : Author
Victor Estellés
  • Function : Author
Kathleen Lantz
  • Function : Author
Joseph Michalsky
  • Function : Author
Thomas Carlund
  • Function : Author
Emilio Cuevas
  • Function : Author
Carlos Toledano
  • Function : Author
Ralf Becker
  • Function : Author
Stephan Nyeki
  • Function : Author
Panagiotis G. Kosmopoulos
  • Function : Author
Viktar Tatsiankou
  • Function : Author
Laurent Vuilleumier
  • Function : Author
Frederick M. Denn
  • Function : Author
Nozomu Ohkawara
  • Function : Author
Osamu Ijima
  • Function : Author
Panagiotis I. Raptis
  • Function : Author
Michael Milner
  • Function : Author
Klaus Behrens
  • Function : Author
Africa Barreto
  • Function : Author
Giovanni Martucci
  • Function : Author
Emiel Hall
  • Function : Author
James Wendell
  • Function : Author
Bryan E. Fabbri
  • Function : Author
Christoph Wehrli
  • Function : Author

Abstract

This study presents the results of the Fourth Filter Radiometer Comparison that was held in Davos, Switzerland, between 28 September and 16 October 2015. Thirty filter radiometers and spectroradiometers from 12 countries participated including reference instruments from global aerosol networks. The absolute differences of all instruments compared to the reference have been based on the World Meteorological Organization (WMO) criterion defined as follows: 95% of the measured data has to be within 0.005 ± 0.001/m (where m is the air mass). At least 24 out of 29 instruments achieved this goal at both 500 and 865 nm, while 12 out of 17 and 13 out of 21 achieved this at 368 and 412 nm, respectively. While searching for sources of differences among different instruments, it was found that all individual differences linked to Rayleigh, NO2, ozone, water vapor calculations and related optical depths and air mass calculations were smaller than 0.01 in aerosol optical depth (AOD) at 500 and 865 nm. Different cloud-detecting algorithms used have been compared. Ångström exponent calculations showed relatively large differences among different instruments, partly because of the high calculation uncertainty of this parameter in low AOD conditions. The overall low deviations of these AOD results and the high accuracy of reference aerosol network instruments demonstrated a promising framework to achieve homogeneity, compatibility and harmonization among the different spectral AOD networks in the near future.
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Dates and versions

insu-03686261 , version 1 (03-06-2022)

Licence

Attribution - CC BY 4.0

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Stelios Kazadzis, Natalia Kouremeti, Henri Diémoz, Julian Gröbner, Bruce W. Forgan, et al.. Results from the Fourth WMO Filter Radiometer Comparison for aerosol optical depth measurements. Atmospheric Chemistry and Physics, 2018, 18, pp.3185-3201. ⟨10.5194/acp-18-3185-2018⟩. ⟨insu-03686261⟩
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