Mathematics – Logic
Scientific paper
Jul 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982qjrms.108..475b&link_type=abstract
Royal Meteorological Society, Quarterly Journal, vol. 108, July 1982, p. 475-502.
Mathematics
Logic
66
Geostrophic Wind, Polar Meteorology, Stratosphere, Stratospheric Warming, Warm Fronts, Atmospheric Models, Mesosphere, Planetary Waves, Primitive Equations, Refracted Waves, Three Dimensional Models, Vorticity Equations, Wave Interaction, Wave Propagation, Wind Profiles
Scientific paper
A three-dimensional primitive equation model of the stratosphere and mesosphere is described. The model was forced at its lower boundary by observed 100 mb height fields for the wavenumber 2 stratospheric warming period of February 1979, and correctly simulated the reversal of the high latitude circulation. This behavior contrasts with earlier model simulations of wavenumber 2 warmings in which forcing of a climatological zonally symmetric initial circulation by a stationary wave perturbation led to an initial reversal of the circulation in low latitudes. In a series of idealized experiments it is shown that wave-wave interaction played no essential role in this simulation and that the ingredients leading to its success were firstly the non-climatological initial wind structure and secondly an imposed longitudinal phase speed for the upward propagating planetary wave at the lower boundary. These studies also demonstrate that in the pre-warming period the direction of propagation of planetary wave activity, as represented by integral curves of the so-called Eliassen-Palm flux, may be qualitatively described by the WKBJ limit of the quasi-geostrophic potential vorticity equation. In this limit, the Eliassen-Palm flux is simply related to the zonal mean refractive index, leading to two complementary diagnostics for studying wave, mean-flow interaction.
Butchart Neal
Clough Shepard A.
Palmer T. N.
Trevelyan P. J.
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