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Article Dans Une Revue Atmospheric Chemistry and Physics Discussions Année : 2007

Growth rates of stratospheric HCFC-22

Résumé

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.
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Dates et versions

hal-00302987 , version 1 (18-06-2008)

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  • HAL Id : hal-00302987 , version 1

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D. P. Moore, J. J. Remedios. Growth rates of stratospheric HCFC-22. Atmospheric Chemistry and Physics Discussions, 2007, 7 (4), pp.10515-10541. ⟨hal-00302987⟩

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