Aerosol optical depth in the European Brewer Network

Research output: Contribution to journalArticle

  • External authors:
  • Javier Lopez-Solano
  • Alberto Redondas
  • Thomas Carlund
  • Juan J. Rodriguez-Franco
  • Henri Diemoz
  • Sergio F. Leon-Luis
  • Bentorey Hernandez-Cruz
  • Carmen Guirado-Fuentes
  • Natalia Kouremeti
  • Julian Grobner
  • Stelios Kazadzis
  • Virgilio Carreno
  • Alberto Berjon
  • Daniel Santana-Diaz
  • Manuel Rodriguez-Valido
  • Veerle De Bock
  • Juan R. Moreta
  • John Rimmer
  • Lamine Boulkelia
  • Nis Jepsen
  • Paul Eriksen
  • Alkiviadis F. Bais
  • Vadim Shirotov
  • Jose M. Vilaplana
  • Keith M. Wilson
  • Tomi Karppinen


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 320 nm. 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.

Bibliographical metadata

Original languageEnglish
Pages (from-to)3885-3902
JournalAtmospheric Chemistry and Physics
Issue number6
Publication statusPublished - 20 Mar 2018