Models regional-scale transformation

One possibility for this was demonstrated in Chapter 3. If impact theory is still valid in a moderately dense fluid where non-model stochastic perturbation theory has been already found applicable, then evidently the continuation of the theory to liquid densities is justified. This simplest opportunity of unified description of nitrogen isotropic Q-branch from rarefied gas to liquid is validated due to the small enough frequency scale of rotation-vibration interaction. The frequency scales corresponding to IR and anisotropic Raman spectra are much larger. So the common applicability region for perturbation and impact theories hardly exists. The analysis of numerous experimental data proves that in simple (non-associated) systems there are three different scenarios of linear rotator spectral transformation. The IR spectrum in rarefied gas is a P-R doublet with either resolved or unresolved rotational structure. In the process of condensation the following may happen. 

In our numerical model, Eq.(2.8) was transformed into a six-point finite-difference equation using the alternative direction implicit method (ADIM). At the edges of the computational grid (—X,X) radiation conditions were applied in combination with complex scaling over a region x >X2, where —X X j) denotes the transverse computational window. For numerical solution of the obtained tridiagonal system of linear equations, the sweep method" was used. 

The calculated values of deposition of atmospheric nitrogen to each region are described in detail for the global scale and for individual domains in various papers (Prospero et al, 1996 Dentener et al, 2000). The authors presented modeled estimates of wet and dry deposition of oxidized (NOy) and reduced (NH ) forms of nitrogen. The resolutions vary from 2.5° x 3.25° LoLa (Latitute-Longitude) for oxidized nitrogen to 10° X 10° FoFa for ammonia species. These deposition estimates are based on a complex model of nitrogen emissions, transformation in atmosphere, transport and deposition. 

Ebel, A., R. Friedrich and H. Rodhe, Eds. (1997) Transport and chemical transformation of pollutants in the troposphere. Vol. 7 Tropospheric modelling and emission estimation. Chemical transport and emission modelling on regional, global and urban scales. Springer-Verlag, Berlin, 440 pp. 

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