HR: 0800h
AN: A21B-0747    [Abstracts]
TI: Age and Pathway Diagnostics for a Stratospheric General Circulation Model
AU: * Schoeberl, M R
EM: mark.r.schoeberl@nasa.gov
AF: NASA/GSFC, Code 916, Greenbelt, Md 20771 United States
AU: Douglass, A R
EM: anne.r.douglass@nasa.gov
AF: NASA/GSFC, Code 916, Greenbelt, Md 20771 United States
AU: Polansky, B
EM: polansky@code916.gsfc.nasa.gov
AF: SSAI, NASA/GSFC, Greenbelt, MD 20771
AB: Using a variety of age diagnostic experiments we examine the stratospheric age spectrum of the Goddard Finite Volume General Circulation Model. Pulse tracer release age-of-air computations are compared to forward and backward trajectory computations. These comparisons show good agreement, and the age-of-air also compares well with observed long lived tracers. Pathway diagnostics show how air arrives in the lowermost stratosphere and the age structure of that region. Using tracers with different lifetimes we can estimate the age spectrum - this technique should be useful in diagnosing transport from various trace gas observations.
DE: 0340 Middle atmosphere--composition and chemistry
DE: 0341 Middle atmosphere--constituent transport and chemistry (3334)
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting