Latitudinal distributions of trace gases in and above the boundary layer |
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Authors: | RA Rasmussen MAK Khalil |
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Institution: | Department of Environmental Science, Oregon Graduate Center Beaverton, Oregon 97006, U.S.A. |
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Abstract: | Statistical analyses of global atmospheric concentrations provide evidence that C2Cl4, CHCl3 and CH3CCl3 (methylchloroform) are more abundant in the tropical boundary layer than above it (α ? 0.09) by 27% (±27%), 21% (?21%, +12%) and 6.4% (±6%) respectively. The air samples on which these results are based were collected by cryogenic techniques during the June 1978 project GAMETAG flights and analyzed soon afterwards by gas chromatography (EC/GC and GC/FID), thus providing latitudinal concentrations of CO, CH4, CCl3F, CCl2F2, CH3CCl3 and light C2-hydrocarbons, both in and above the boundary layer. In August 1980, after further development of analytical techniques, the stored air samples were re-analyzed to establish the latitudinal distributions of CH3I, CHCl3, C2Cl4, C2F3Cl3 (F-113) and CHClF2 (F-22) in and above the boundary layer. Stability studies, spanning a year, show that the concentrations of these gases do not change in the flasks. |
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