A new numerical model of the middle atmosphere. I - Dynamics and transport of tropospheric source gases

Details A new numerical model of the middle atmosphere. I - Dynamics and transport of tropospheric source gases A new numerical model of the middle atmosphere. I - Dynamics and transport of tropospheric source gases

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....9712967g&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. D12, Aug. 20, 1992, p. 12,967-12,991. Research supported by NAF.

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Atmospheric Circulation, Mathematical Models, Middle Atmosphere, Planetary Waves, Radiative Transfer, Trace Contaminants, Atmospheric Models, Photochemical Reactions, Vorticity Equations

Scientific paper

Attention 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.

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