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 (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.
Citation: Moore, D. P. and Remedios, J. J.: Growth rates of stratospheric HCFC-22, Atmos. Chem. Phys., 8, 73-82, doi:10.5194/acp-8-73-2008, 2008.