The vertical distribution of CH4, N2O, CFC-12 and CFC-11 in the middle atmosphere at mid-latitudes

Lal, Shyam ; Borchers, R. ; Fabian, P. ; Krueger, B. C. (1989) The vertical distribution of CH4, N2O, CFC-12 and CFC-11 in the middle atmosphere at mid-latitudes Journal of Atmospheric and Terrestrial Physics, 51 (2). pp. 81-90. ISSN 0021-9169

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Official URL: http://dx.doi.org/10.1016/0021-9169(89)90107-4

Related URL: http://dx.doi.org/10.1016/0021-9169(89)90107-4

Abstract

CH4, N2O, CFC-12 and CFC-11 data analysed from samples collected by means of cryogenic samplers from five balloon flights conducted during the 1982-1984 period, are presented. The vertical distributions of these gases show structures with dominant scale size of 16 ±2.5 km. The amplitude of the perturbation is larger for the species having steeper gradient. A comparison of the present results with the results of earlier measurements representing the period of 1977-1979 do not show any appreciable change in the mixing ratios of CH4 and N2O. However, an average tropospheric increase of (6.5±1)% per year is found for CFC-12 and CFC-11. This annual change in the mixing ratios of CFC-12 and CFC-11 is found to increase with height suggesting a time lag of about 6 years between the troposphere and the altitude region around 25 km. The average mixing ratios of CH4 and N2O are compared with the available satellite/spacelab data. This data set shows a satisfactory agreement with the present in situ measurements for the height region above 30 km.

Item Type:Article
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ID Code:19156
Deposited On:23 Nov 2010 13:24
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