Linear stability of free planetary waves in the presence of radiative-photochemical feedbacks

Details Linear stability of free planetary waves in the presence of radiative-photochemical feedbacks Linear stability of free planetary waves in the presence of radiative-photochemical feedbacks

Aug 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jats...48.1837n&link_type=abstract

Journal of the Atmospheric Sciences (ISSN 0022-4928), vol. 48, Aug. 15, 1991, p. 1837-1855. Research supported by NASA.

Physics

10

Atmospheric Circulation, Atmospheric Models, Linear Equations, Photochemical Reactions, Planetary Waves, Radiative Transfer, Atmospheric Heating, Geostrophic Wind, Ozone Depletion, Stratosphere

Scientific paper

The diabatic effects of Newtonian cooling and ozone-dynamics interaction on the linear stability of free planetary waves in the atmosphere have been studied using a simple beta-plane model. The model couples radiative transfer, ozone advection, and ozone photochemistry with the quasi-geostrophic dynamical circulation. An analytical expression is derived which demonstrates the following: (1) the influence of meridional ozone advection on wave growth or decay depends on the wave and basic state vertical structures; and (2) photochemically accelerated cooling, which predominates in the upper stratosphere, augments the Newtonian cooling rate and is stabilizing. Attention is also given to the 1D linear stability problem which is numerically solved for a Charney basic state and for zonal mean basic states. It is shown that ozone heating generated by ozone-dynamics interaction in the stratosphere can reduce (enhance) the damping rates due to Newtonian cooling by as much as 50 percent for planetary waves of large vertical scale and maximum amplitude in the stratosphere.

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