Vertical transport rates in the statosphere in 1993 from observations of CO2, N2O, and CH4

Measurements of CO2, N2O, and CH4 are analyzed to define hemispheric average vertical exchange rates in the lower stratosphere from November 1992 to October 1993. Effective vertical diffusion coefficients were small in summer, less than or equal to 1 sq m/s at altitudes below 25 km; values were simi...

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Published inGeophysical research letters Vol. 21; no. 23
Main Authors Wofsy, Steven C., Boering, Kristie A., Daube, Bruce C., Jr, Mcelroy, Michael B., Loewenstein, Max, Podolske, James R., Elkins, James W., Dutton, Geoffrey S., Fahey, David W.
Format Journal Article
LanguageEnglish
Published Legacy CDMS 15.11.1994
Subjects
Geophysics
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Summary:Measurements of CO2, N2O, and CH4 are analyzed to define hemispheric average vertical exchange rates in the lower stratosphere from November 1992 to October 1993. Effective vertical diffusion coefficients were small in summer, less than or equal to 1 sq m/s at altitudes below 25 km; values were similar near the tropopause in winter, but increased markedly with altitude. The analysis suggests possible longer residence times for exhaust from stratospheric aircraft, and more efficient transport from 20 km to the middle stratosphere, than predicted by many current models. Seasonally-resolved measurements of stratospheric CO2 and N2O provide significant new constraints on rates for global-scale vertical transport.
Bibliography:Legacy CDMS
CDMS
ISSN:0094-8276