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Estimation of Stratospheric Age Spectrum from Chemical TracersWe have developed a technique to diagnose the stratospheric age spectrum and estimate the mean age of air using the distributions of at least four constituents with different photochemical lifetimes. We demonstrate that the technique works using a 3D CTM and then apply the technique to UMS CLAES January 1993 observations of CFC11, CFC12, CH4 and N2O. Our results are generally in agreement with mean age of air estimates from the chemical model and from observations of SF6 and CO2; however, the mean age estimates show an intrusion of very young tropical air into the mid-latitude stratosphere. This feature is consistent with mixing of high N20 air out of the tropics during the westerly phase of the QBO.
Document ID
20050179471
Acquisition Source
Goddard Space Flight Center
Document Type
Preprint (Draft being sent to journal)
Authors
Schoeberl, Mark R.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Douglass, Anne R.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Polansky, Brian
(Science Systems and Applications, Inc. Greenbelt, MD, United States)
Date Acquired
September 7, 2013
Publication Date
January 1, 2005
Subject Category
Geophysics
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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