First measurements of the HCFC-142b trend from atmospheric chemistry experiment (ACE) solar occultation spectra

Curtis P. Rinsland, Linda Chiou, Chris Boone, Peter Bernath, Emmanuel Mahieu

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The first measurement of the HCFC-142b (CH3CClF2) trend near the tropopause has been derived from volume mixing ratio (VMR) measurements at northern and southern hemisphere mid-latitudes for the 2004-2008 time period from spaceborne solar occultation observations recorded at 0.02 cm(-1) resolution with the ACE (atmospheric chemistry experiment) Fourier transform spectrometer. The HCFC-142b molecule is currently the third most abundant HCFC (hydrochlorofluorocarbon) in the atmosphere and ACE measurements over this time span show a continuous rise in its volume mixing ratio. Monthly average measurements at northern and southern hemisphere mid-latitudes have similar increase rates that are consistent with surface trend measurements for a similar time span. A mean northern hemisphere profile for the time span shows a near constant VMR at 8-20 km altitude range, consistent on average for the same time span with in situ results. The nearly constant vertical VMR profile also agrees with model predictions of a long lifetime in the lower atmosphere. (c) 2009 Elsevier Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)2127-2134
Number of pages8
JournalJournal of Quantitative Spectroscopy and Radiative Transfer
Issue number18
Publication statusPublished - Dec 2009


  • Remote sensing
  • Atmospheric chemistry
  • Composition
  • Hydrochlorofluorocarbons
  • Trends
  • Ozone depletion

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