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First measurements of the HCFC-142b trend from atmospheric chemistry experiment (ACE) solar occultation spectra |
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| Authors: | Curtis P Rinsland Linda Chiou Chris Boone Peter Bernath Emmanuel Mahieu |
| Institution: | aNASA Langley Research Center, Hampton, VA, USA;bScience Systems and Applications, Inc., Hampton, VA, USA;cDepartment of Chemistry, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1;dDepartment of Chemistry, University of York, Heslington, York YO10 5DD, UK;eInstitute of Astrophysics and Geophysics, University of Liège, Liège, Belgium |
| Abstract: | 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. |
| Keywords: | Remote sensing Atmospheric chemistry Composition Hydrochlorofluorocarbons Trends Ozone depletion |
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