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@ARTICLE{Varma:3188,
      author       = {Varma, R.M. and Venables, D.S. and Ruth, A.A. and Heimann,
                      U. and Schlosser, E. and Dixneuf, S.},
      title        = {{L}ong optical cavities for open-path monitoring of
                      atmospheric trace gases and aerosol extinction},
      journal      = {Applied optics},
      volume       = {48},
      issn         = {0003-6935},
      address      = {Washington, DC},
      publisher    = {Optical Soc. of America},
      reportid     = {PreJuSER-3188},
      pages        = {B159 - B171},
      year         = {2009},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {An incoherent broadband cavity-enhanced absorption
                      spectroscopy setup employing a 20 m long optical cavity is
                      described for sensitive in situ measurements of light
                      extinction between 630 and 690 nm. The setup was installed
                      at the SAPHIR atmospheric simulation chamber during an
                      intercomparison of instruments for nitrate (NO3) radical
                      detection. The long cavity was stable for the entire
                      duration of the two week campaign. A detection limit of
                      similar to 2 pptv for NO3 in an acquisition time of 5 s was
                      established during that time. In addition to monitoring NO3,
                      nitrogen dioxide (NO2) concentrations were simultaneously
                      retrieved and compared against concurrent measurements by a
                      chemiluminescence detector. Some results from the campaign
                      are presented to demonstrate the performance of the
                      instrument in an atmosphere containing water vapor and
                      inorganic aerosol. The spectral analysis of NO3 and NO2, the
                      concentration dependence of the water absorption cross
                      sections, and the retrieval of aerosol extinction are
                      discussed. The first deployment of the setup in the field is
                      also briefly described. (C) 2009 Optical Society of America},
      keywords     = {J (WoSType)},
      cin          = {ICG-2},
      ddc          = {530},
      cid          = {I:(DE-Juel1)VDB791},
      pnm          = {Atmosphäre und Klima},
      pid          = {G:(DE-Juel1)FUEK406},
      shelfmark    = {Optics},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000264413400022},
      doi          = {10.1364/AO.48.00B159},
      url          = {https://juser.fz-juelich.de/record/3188},
}