Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 8 4 2008 10.5194/acpd-8-16517-2008 http://www.atmos-chem-phys-discuss.net/8/16517/2008/ http://www.atmos-chem-phys-discuss.net/8/16517/2008/acpd-8-16517-2008.html http://www.atmos-chem-phys-discuss.net/8/16517/2008/acpd-8-16517-2008.pdf 16517 16553 2008-08-29 Measurement of glyoxal using an incoherent broadband cavity enhanced absorption spectrometer R. A. Washenfelder rebecca.washenfelder@noaa.gov A. O. Langford H. Fuchs S. S. Brown Cooperative Institute for Research in Environmental Sciences, 216 UCB, Univ. Colorado, Boulder, CO 80309, USA Chemical Sciences Division, National Oceanic and Atmospheric Administration, 325 Broadway, Boulder, CO 80305, USA We describe an instrument for simultaneous measurements of glyoxal (CHOCHO) and nitrogen dioxide (NO₂) using cavity enhanced absorption spectroscopy with a broadband light source. The output of a Xenon arc lamp is coupled into a 1 m optical cavity, and the spectrum of light exiting the cavity is recorded by a grating spectrometer with a charge-coupled device (CCD) array detector. The mirror reflectivity and effective path lengths are determined from the known Rayleigh scattering of He and dry zero air (N₂+O₂). Least-squares fitting, using published reference spectra, allow the simultaneous retrieval of CHOCHO, NO₂, O₄, and H₂O in the 441 to 469 nm spectral range. For a 1-min sampling time, the minimum detectable absorption is 4×10^−10 cm^−1, and the precision (±1σ) on signal for measurements of CHOCHO and NO₂ is 29 pptv and 20 pptv, respectively. We directly compare the incoherent broadband cavity enhanced absorption spectrometer to 404 and 532 nm cavity ringdown instruments for CHOCHO and NO₂ detection, and find linear agreement over a wide range of concentrations. 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