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a new numerical model of the middle atmosphere. i - dynamics and transport of tropospheric source gasesAttention is given to a new model of the middle atmosphere which includes, in addition to the equations governing the zonal mean state, a potential vorticity equation for a single planetary-scale Rossby wave, and an IR radiative transfer code for the stratosphere and lower mesosphere, which replaces the Newtonian cooling parameterization used previously. It is shown that explicit computation of the planetary-scale wave field yields a more realistic representation of the zonal mean dynamics and the distribution of trace chemical species. Wave breaking produces a well-mixed 'surf zone' equatorward of the polar night vortex and drives a meridional circulation with downwelling on the poleward side of the vortex. This combination of mixing and downwelling produces shallow meridional gradients of trace gases in the subtropics and middle latitudes, and very steep gradients at the edge of the polar vortex. Computed distributions of methane and nitrous oxide are shown to agree well with observations.
Document ID
19920072018
Document Type
Reprint (Version printed in journal)
Authors
Garcia, Rolando R.
(NCAR Boulder, CO, United States)
Stordal, Frode
(Norwegian Institute for Air Research Lillestrom, Norway)
Solomon, Susan
(NOAA, Aeronomy Laboratory, Boulder CO, United States)
Kiehl, Jeffrey T.
(NCAR Boulder, CO, United States)
Date Acquired
August 15, 2013
Publication Date
August 20, 1992
Publication Information
Publication: Journal of Geophysical Research
Volume: 97
Issue: D12
ISSN: 0148-0227
Subject Category
GEOPHYSICS
Funding Number(s)
CONTRACT_GRANT: NASA ORDER W-15954
Distribution Limits
Public
Copyright
Other