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@ARTICLE{Bohn:807643,
      author       = {Bohn, Birger and Heard, Dwayne E. and Mihalopoulos,
                      Nikolaos and Plass-Dülmer, Christian and Schmitt, Rainer
                      and Whalley, Lisa K.},
      title        = {{C}haracterisation and improvement of j({O}1{D}) filter
                      radiometers},
      journal      = {Atmospheric measurement techniques},
      volume       = {9},
      issn         = {1867-1381},
      address      = {Katlenburg-Lindau},
      publisher    = {Copernicus},
      reportid     = {FZJ-2016-02130},
      pages        = {3455-3466},
      year         = {2016},
      abstract     = {Atmospheric O3 →  O(1D) photolysis frequencies
                      j(O1D) are crucial parameters for atmospheric photochemistry
                      because of their importance for primary OH formation. Filter
                      radiometers have been used for many years for in situ field
                      measurements of j(O1D). Typically the relationship between
                      the output of the instruments and j(O1D) is non-linear
                      because of changes in the shape of the solar spectrum
                      dependent on solar zenith angles and total ozone columns.
                      These non-linearities can be compensated for by a correction
                      method based on laboratory measurements of the spectral
                      sensitivity of the filter radiometer and simulated solar
                      actinic flux density spectra. Although this correction is
                      routinely applied, the results of a previous field
                      comparison study of several filter radiometers revealed that
                      some corrections were inadequate. In this work the spectral
                      characterisations of seven instruments were revised, and the
                      correction procedures were updated and harmonised
                      considering recent recommendations of absorption cross
                      sections and quantum yields of the photolysis process
                      O3 →  O(1D). Previous inconsistencies were largely
                      removed using these procedures. In addition, optical
                      interference filters were replaced to improve the spectral
                      properties of the instruments. Successive determinations of
                      spectral sensitivities and field comparisons of the modified
                      instruments with a spectroradiometer reference confirmed the
                      improved performance. Overall, filter radiometers remain a
                      low-maintenance alternative of spectroradiometers for
                      accurate measurements of j(O1D) provided their spectral
                      properties are known and potential drifts in sensitivities
                      are monitored by regular calibrations with standard lamps or
                      reference instruments.},
      cin          = {IEK-8},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IEK-8-20101013},
      pnm          = {243 - Tropospheric trace substances and their
                      transformation processes (POF3-243)},
      pid          = {G:(DE-HGF)POF3-243},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000381094100029},
      doi          = {10.5194/amt-9-3455-2016},
      url          = {https://juser.fz-juelich.de/record/807643},
}