Planetary wave modelling of the middle atmosphere - The importance of transients

Computer Science – Sound

Scientific paper

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Atmospheric Models, Middle Atmosphere, Planetary Waves, Stratosphere, Atmospheric Sounding, Geopotential Height, Mathematical Models, Noaa 6 Satellite, Traveling Waves

Scientific paper

A linear planetary wave model of the middle atmosphere is used to diagnose the wavenumber-1 structure for a day during December 1979 given the wave forcing and the time-derivative terms. The time derivatives are calculated using data from the stratospheric sounding unit (SSU) on NOAA 6 for days on either side of the principal day of interest. The effect of the time-derivative terms is significant and the model is found to be in fair agreement with the data in high latitudes although low latitude features are poorly reproduced. The influence of the transient wave components is discussed and in particular some dissipation-like effects are demonstrated which might clarify the role of Rayleigh friction in planetary wave models.

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