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| Book/Report | FZJ-2018-02706 |
1986
Kernforschungsanlage Jülich, Verlag
Jülich
Please use a persistent id in citations: http://hdl.handle.net/2128/18360
Report No.: Juel-2098
Abstract: The purpose of atmospheric modelling is to describe the physical and chemical state of the earth's atmosphere as exactly as possible. In order to do so, one has to consider the basic laws of energy and momentum conservation, the mass continuity equation and the equations of radiative transfer. With these equations it is - in principle - possible to describe atmospheric conditions exactly. In practice, however, one has to make a number of simplifications since the available computer facilities, especially the limited storage, running time and costs, are inadequate. (E. g. : Miller et al., 1979; Tuck, 1979 ; Lin et al., 1980; Pyle, 1980; Pyle and Rogers, 1980; Garcia and Solomon, 1983). The purpose of the one-dimensional model presented here is to describe the chemical behaviour and the concentration profiles of atmospheric gases. Therefore we only have to consider the mass continuity equation and neither the equation for momentum continuity nor that for conservation ofenergy are taken into account. They are instead implicitly defined by boundary conditions. Concerning the radiative transfer, we have to make a number of assumptions described below. Solving the mass continuity equations for all the components of the atmosphere leads to a time-dependent model, threedimensionalin space. If we reduce the geometrical dependencies by averaging over longtitude and, furthermore, over latitude, we obtain a time-dependent, one-dimensional (1-D) model, by means of which globally averaged profiles of concentrations with altitude are attained. Our 1-D-model lays great emphasis on the chemical behaviourof the atmosphere. The program allows three different versions. [...]
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