| Autor: |
Chris D. Boone, Peter F. Bernath, Curtis P. Rinsland, Emmanuel Mahieu, Linda Chiou |
| Rok vydání: |
2009 |
| Předmět: |
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| Zdroj: |
Journal of Quantitative Spectroscopy and Radiative Transfer. 110:2127-2134 |
| ISSN: |
0022-4073 |
| DOI: |
10.1016/j.jqsrt.2009.05.011 |
| Popis: |
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 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 midlatitudes 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 8-20km 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. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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Full Text from ScienceDirect