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A. WIIN NIELSEN
This note contains an investigation of the inertial motion on the sphere including all the terms of the Coriolis forces. The velocity vector has a zonal, a meridional and a height components. The time dependence of these compone...
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A. WIIN NIELSEN
The investigation described in the present paper is concerned with the structure of atmospheric waves in the middle latitudes. The typical wave in the troposphere has, according to observational studies, a difference between the...
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A. WIIN NIELSEN
The advection terms in the atmospheric equations of motion will in the spectral domain result in an exchange of available potential and kinetic energies between the various wave numbers. Observational studies have demonstrated that while the available...
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A. WIIN NIELSEN
The well known geostrophic adjustment problem has been reinvestigated using first a model of a homogeneous atmosphere with a free surface. The basic equations in this model are the two equations of motion for the horizontal velocity components modifie...
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A. WIIN NIELSEN
A barotropic model with momentum transport, a simple baroclinic model with transports of heat only and a baroclinic model with both momentum and heat transports are used to illustrate the instabilities and the nonlinear longer term behavior of barotro...
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A. WIIN NIELSEN
The stability of atmospheric waves with low wave numbers is investigated using a quasi-geostrophic model of the second kind. Such a model is based on the thermodynamic equation, the continuity equation and a rigorous use of the geostrophic relations. ...
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A. WIIN NIELSEN
The barotropic and the mixed barotropic-baroclinic stability problems are treated using a series expansion in trigonometric functions of the mean zonal velocity and the perturbation stream function. A two-level quasi-nondivergent model is used to hand...
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A. WIIN NIELSEN
Observations show that the atmospheric kinetic energy on average obeys a relation saying that its dependence on the longitudinal wave number is n-3 in an interval with wave numbers larger than the wave number with maximal conversion of eddy available p...
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A. WIIN NIELSEN
A model of the zonally averaged structure of the atmosphere is designed. It employs exchange coefficients to describe the meridional transports of quasi-conservative quantities. In contrast to earlier models the exchange coefficients have a specified ...
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A. WIIN NIELSEN
The zonal state of the atmosphere is reconsidered using interaction coefficients to simulate the interplay between the atmospheric waves and the zonally averaged state. In order to correct too large easterly wind in an earlier model the interaction co...
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