Atmospheric Chemistry and Physics
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8
1
2008
10.5194/acp-8-73-2008
http://www.atmos-chem-phys.net/8/73/2008/
http://www.atmos-chem-phys.net/8/73/2008/acp-8-73-2008.html
http://www.atmos-chem-phys.net/8/73/2008/acp-8-73-2008.pdf
73
82
2008-01-14
Growth rates of stratospheric HCFC-22
D. P. Moore
dpm9@le.ac.uk
J. J. Remedios
EOS, Space Research Centre, Department of Physics and Astronomy, University of Leicester, Leicester, LE1 7RH, UK
The Michelson Interferometer for Passive Atmospheric Sounding
onboard ENVISAT (MIPAS-E) offers the opportunity to detect and
spectrally resolve many atmospheric minor constituents affecting
atmospheric chemistry. In this paper, we describe an algorithm
produced to retrieve HCFC–22 profiles from MIPAS-E measurements made
in 2003 and present results from this scheme between 300 and 50 mb.
By comparison with ATMOS (AT–3) version 3 data, we find a mean
Northern Hemisphere mid-latitude (20–50° N) HCFC–22
growth rate between 1994 and 2003 of 5.4±0.7 pptv/yr in the
lower stratosphere (LS) and a mean LS Southern Hemisphere growth
rate (60–80° S) of 6.0±0.7 pptv/yr in the
same period. We test the feasibility of using a global data set to
estimate the chemical lifetime of HCFC–22 in the LS and we derive
this for two regions: 20–50° N (246±38
years) and 60–80° S (274±34 years). From
these data we note a global LS lifetime of 260±25 years,
significantly longer than previous estimates.
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