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S. G. Demyshev 《Physical Oceanography》1990,1(6):487-494
A numerical model for ocean thermohydrodynamics is considered whose difference scheme permits a number of linear and quadratic invariants to be retained. The model is used as the basis for adaptive computations in the Equatorial Atlantic ocean. Model equations were integrated using different values of the coefficients of diffusion and momentum turbulent exchange. It has been shown that variations of these coefficients strongly influence the intensity of jet streams and the structure of the thermocline.Translated by Vladimir A. Puchkin. 相似文献
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A procedure for the four-dimensional (4D) analysis of the hydrophysical fields in the Black Sea with an assimilation of the temperature and salinity (T, S) data was realized on the basis of a numerical model which involves the primitive equations of motion, and the heat and salt advection equations. Two experiments were carried out which differed by the observation data assimilation procedure. Analysis has shown that the observation data assimilation procedure realized using the energy-balanced model allows the reproduction of some synoptic features of the circulation in the Black Sea. A comparison of two computations demonstrates the efficiency of assimilating the measurement data on the basis of the 4D analysis as compared with the sequential objective analysis.Translated by Mikhail M. Trufanov. 相似文献
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V. V. Knysh S. G. Demyshev G. K. Korotaev A. S. Sarkisyan 《Izvestiya Atmospheric and Oceanic Physics》2007,43(3):363-377
A method for combined assimilation of climatic hydrologic fields of temperature, salinity, and the climatic dynamic level of the Black Sea into a model of sea dynamics is proposed. The monthly mean fields of the dynamic sea level were obtained from the results of assimilation of satellite altimetry data into the model. The statistical characteristics of errors in the forecasts of the level, salinity, and temperature were assumed to be proportional to the statistical characteristics of the differences between monthly mean climatic fields of temperature, salinity, and sea level calculated by means of assimilating altimetry observations of the sea level and analogous climatic hydrologic fields. The climatic fields of currents are reconstructed and analyzed. The assimilation of the climatic altimetry level allows the reproduction (in current fields) of quasi-stationary synoptic anticyclonic eddies located along the periphery of the Black Sea Rim Current. 相似文献
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A numerical experiment has been carried out using a hydrodynamical model with nonlinear equations of motion and heat and salt advection to reconstruct the fields of hydrophysical parameters taking into account the real atmospheric forcing for the autumn season along the southern coast of the Crimean Peninsula. The studied part of the coast is situated at 44.25°N 33.95°E/44.72°N 34.55°E. High spatial resolution is used for modeling: 350 m in the horizontal plane with 38 layers in the vertical; the bottom topography is described in detail with ~500 m resolution. Detected and studied meso- and sub-mesoscale structures in the current field agree well with the observational data, which is impossible or hard to identify in numerical experiments with coarser resolution. Their kinematic characteristics and the lifetime are defined and some mechanisms of their origin are suggested. 相似文献
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Physical regularities of free oscillations of the Azov Sea level induced after the cessation of long-lasting action of wind are analyzed. Spatial characteristics of seiche oscillations, the position of nodal lines, and the velocity of induced currents are simulated with the three-dimensional nonlinear barotropic hydrodynamic model. It was found that in the coastal zone the maximum amplitude of these oscillations is comparable with the value of storm surges. It is demonstrated that seiches make essential contribution to the variability of velocity of currents. 相似文献
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S. G. Demyshev 《Physical Oceanography》1992,3(4):293-298
A near-bottom pressure equation consistent with the original set of difference equations is derived in the framework of a numerical energetically-balanced model. The model is used to simulate numerically three-dimensional density and current velocity fields and in the Black Sea for a specific season. The climatic values of temperature, salinity, and tangential wind stress during summer are applied as the original conditions. Analysis of the hydrophysical fields at the final moment of integrating is performed. The difference between new data and data derived earlier is demonstrated.Translated by V. Puchkin. 相似文献
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Finite-differential schemes (continous in time) are studied for the shallow water equations on the equatorial -plane on the grids B and C. The B-grid spectrum is shown to be symmetrical about fourgrid interval waves. It results in the wrong sign of the group velocity in the ddomain of wavelengths less than four intervals of the grid. An analytical solution is given for the differential analogues of Kelving and Yanai waves on grid C. A conclusion is drawn on the advantage of grid, C and the necessary filtration of the high-frequency band of the spectrum for grid B, if the grid intervals are 100 km or less.Translated by Mikhail M. Trufanov 相似文献
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We present the results of analysis of the seasonal variability of the climatic cold intermediate layer based on a complex approach with the use of series of successive changes in the hydrophysical parameters computed according to the model with assimilation of the climatic fields of temperature and salinity. We analyze some mechanisms of formation of the cold intermediate layer. It is discovered that the layer of cold waters, which is continuous after regeneration and transformation in the entire deep-water area of the sea, becomes discontinuous at the end of the year (October–November). One of the possible mechanisms responsible for the appearance of discontinuities is discussed. 相似文献
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A finite-difference system of motion equations for a baroclinic ocean with an irregular bottom is developed on the basis of the box method and the method of indefinite coefficients. The numerical model is shown to possess the property of conserving momentum, mass, and energy. In the case of barotropic motion, the finite-difference scheme retains potential enstrophy. A numerical experiment on the adaptation of hydrophysical fields in the Equatorial Atlantic in summer was carried out within the framework of the model developed. We managed to obtain a series of features of the equatorial circulation when the coefficients of turbulent exchange and diffusion were small enough.Translated by Mikhail M. Trufanov. 相似文献