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Roles of mean meridional circulation and eddy diffusion in the transport of trace substances in the lower stratosphere

1968; American Geophysical Union; Volume: 73; Issue: 14 Linguagem: Inglês

10.1029/jb073i014p04461

2156-2202

P.H. Gudiksen, A. W. Fairhall, Richard J. Reed,

Atmospheric chemistry and aerosols

Journal of Geophysical Research (1896-1977)Volume 73, Issue 14 p. 4461-4473 Roles of mean meridional circulation and eddy diffusion in the transport of trace substances in the lower stratosphere Paul H. Gudiksen, Paul H. GudiksenSearch for more papers by this authorA. W. Fairhall, A. W. FairhallSearch for more papers by this authorRichard J. Reed, Richard J. ReedSearch for more papers by this author Paul H. Gudiksen, Paul H. GudiksenSearch for more papers by this authorA. W. Fairhall, A. W. FairhallSearch for more papers by this authorRichard J. Reed, Richard J. ReedSearch for more papers by this author First published: 15 July 1968 https://doi.org/10.1029/JB073i014p04461Citations: 55AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onEmailFacebookTwitterLinkedInRedditWechat Abstract Recent estimates of mean meridional motions and eddy diffusion coefficients in the lower stratosphere and upper troposphere are used to study the roles of mean circulation and eddy mixing in determining the spread of tungsten 185 injected into the lower stratosphere in the Hardtack test series of 1958. The observed distribution of tungsten 185 is reproduced satisfactorily for a period of 18 months after the injection, provided that the diffusion coefficients estimated from heat flux data are reduced by a factor of about 8. The mean meridional circulation is found to play a minor role in the transport process, its chief contribution being to raise the center of maximum concentration by 2 to 3 km in the equatorial region, in agreement with the observations. The mean residence time for a tracer injected into the equatorial stratosphere between 18 and 20 km is found to be about 10 months, with most of the transport into the troposphere occurring at middle latitudes. References Brewer, A. W., Evidence for a world circulation provided by measurement of helium and water vapor distribution in the stratosphere, Quart. J. Roy. Meteorol. Soc., 75, 351–363, 1949. Davidson, B., J. P. Friend, H. 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Fairhall, Radiocarbon from nuclear weapons tests, J. Geophys. Res., 73, 1185–1200, 1968. Citing Literature Volume73, Issue1415 July 1968Pages 4461-4473 ReferencesRelatedInformation