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|Title:||Growth rates of stratospheric HCFC-22|
|Authors:||Moore, David P.|
Remedios, John J.
|Publisher:||Copernicus Publications on behalf of the European Geosciences Union|
|Citation:||Atmospheric Chemistry And Physics, 2008, 8 (1), pp. 73-82 (10)|
|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.|
|Rights:||Copyright © Author(s) 2008. This work is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License (https://creativecommons.org/licenses/by-nc-sa/2.5/).|
|Appears in Collections:||Published Articles, Dept. of Physics and Astronomy|
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