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. (c) 2009 Elsevier Ltd. All rights reserved.
| Original language | English |
|---|---|
| Pages (from-to) | 2127-2134 |
| Number of pages | 8 |
| Journal | Journal of Quantitative Spectroscopy and Radiative Transfer |
| Volume | 110 |
| Issue number | 18 |
| DOIs | |
| Publication status | Published - Dec 2009 |
Keywords
- Remote sensing
- Atmospheric chemistry
- Composition
- Hydrochlorofluorocarbons
- Trends
- Ozone depletion
- MOLECULAR SPECTROSCOPIC DATABASE
- CROSS-SECTIONS