Atmos. Chem. Phys. Discuss., 7, 10515-10541, 2007
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This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
Growth rates of stratospheric HCFC-22
D. P. Moore and J. J. Remedios
EOS, Space Research Centre, Department of Physics and Astronomy, University of Leicester, Leicester, LE1 7RH, UK

Abstract. 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 (259±38 years) and 60–80° S (288±34 years). From these data we note a global LS lifetime of 274±25 years, significantly longer than previous estimates.

Citation: Moore, D. P. and Remedios, J. J.: Growth rates of stratospheric HCFC-22, Atmos. Chem. Phys. Discuss., 7, 10515-10541, doi:10.5194/acpd-7-10515-2007, 2007.
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