Simultaneous measurements of visible (400-700 nm) and infrared (3.4 mu m) NO2 absorption

Denis G. Dufour, James R. Drummond, C. Thomas McElroy, Clive Midwinter, Peter F. Bernath, Kaley A. Walker, Caroline Nowlan

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Laboratory measurements of NO2 absorption were obtained in the visible (400-700 nm) and mid-infrared (3.4 mu m) regions simultaneously using SCISAT-1's ACE-FTS (atmospheric chemistry experiment-Fourier transform spectrometer) and MAESTRO (measurement of aerosol extinction in the stratosphere and troposphere retrieved by occultation) spectrometers. An intercomparison of these measurements was used to verify the consistency between the HITRAN 2004 3.4-mu m band strengths and the strengths of three different visible cross section data sets. These measurements should be of interest to the remote-sensing community, since NO2 measurements obtained by infrared-range instruments are often compared to those obtained by visible-range instruments without accurate knowledge of the consistency between the visible and infrared absorption coefficients. Two significant results were obtained in this study: (1) A 0.5% agreement was found between the HITRAN 2004 line strengths and the Vandaele et al. (Vandaele, A. C.; Hermans, C.; Fally, S.; Carleer, M.; Colin, R.; Merienne, M.-F.; Jenouvrier, A.; Coquart, B. J. Geophys. Res. 2002, 107 (D18), 4348) temperature-corrected cross sections, and (2) the mean pressure-broadened half-width of NO2 by NO in the 3.4-mu m band was measured as being 0.096 +/- 0.001 cm(-1) atm(-1). The latter finding is thought to be unreported by the literature.

Original languageEnglish
Pages (from-to)12414-12418
Number of pages5
JournalJournal of Physical Chemistry A
Issue number45
Publication statusPublished - 16 Nov 2006


  • N2O4

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