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- Author or Editor: HANS ØKLAND x
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Abstract
Although it is proved theoretically that a two-parameter model is capable of converting potential energy into kinetic, there has been some doubt about its ability to predict successfully the strong cyclogenesis often associated with this energy conversion. The experiment described in this paper is intended to be a contribution to the solution of this problem.
A two-level primitive equation model with constant static stability has been integrated for two cases characterized by typical baroclinic developments, and the results are compared to the barotropic forecasts for the same cases.
The two-level prognoses are not better than the barotropic in many respects, but they show that at least some baroclinic developments can be predicted by this model.
Abstract
Although it is proved theoretically that a two-parameter model is capable of converting potential energy into kinetic, there has been some doubt about its ability to predict successfully the strong cyclogenesis often associated with this energy conversion. The experiment described in this paper is intended to be a contribution to the solution of this problem.
A two-level primitive equation model with constant static stability has been integrated for two cases characterized by typical baroclinic developments, and the results are compared to the barotropic forecasts for the same cases.
The two-level prognoses are not better than the barotropic in many respects, but they show that at least some baroclinic developments can be predicted by this model.
Abstract
A formal solution of a linear geostrophic adjustment problem for the baroclinic atmosphere is derived. On the basis of this solution, the adjustment toward balance in primitive equation models is discussed with respect to its dependence on scale in space and time, and also with respect to the processes by which the adjustment takes place, that is, the damping and dispersion of the gravitational wave energy. Throughout the discussion, the effect of finite-difference approximations is considered. Finally, a numerical experiment is described that illustrates some of the results from the theoretical investigations.
Abstract
A formal solution of a linear geostrophic adjustment problem for the baroclinic atmosphere is derived. On the basis of this solution, the adjustment toward balance in primitive equation models is discussed with respect to its dependence on scale in space and time, and also with respect to the processes by which the adjustment takes place, that is, the damping and dispersion of the gravitational wave energy. Throughout the discussion, the effect of finite-difference approximations is considered. Finally, a numerical experiment is described that illustrates some of the results from the theoretical investigations.
Abstract
A numerical multi-level model governed by linearized equations is considered, and the eigensolutions for the gravity oscillations are computed. An expansion of the initial values in terms of the eigensolutions is shown to give useful information regarding the suppression of noise in weather prediction models, and the relation between the initial values and the meteorologically significant results of the integrations. Applications to the problem of data initialization and assimilation are discussed.
Abstract
A numerical multi-level model governed by linearized equations is considered, and the eigensolutions for the gravity oscillations are computed. An expansion of the initial values in terms of the eigensolutions is shown to give useful information regarding the suppression of noise in weather prediction models, and the relation between the initial values and the meteorologically significant results of the integrations. Applications to the problem of data initialization and assimilation are discussed.
