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The characteristics and formation conditions of eddy meridional heat transport (MHT) in the eastern equatorial Pacific are studied using the results of eddy-resolving numerical modeling as compared with observational and reanalysis data. Calculations of the eddy MHT convergence at the equator are performed and realistic results in the analyzed region except for its easternmost part are obtained. The interannual variability and velocity of propagation of tropical instability waves are estimated. The errors of the time-averaged model solution are analyzed, and the assumptions on the mechanisms of their occurrence are made. 相似文献
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A parallel realization of the Ensemble Optimal Interpolation (EnOI) data assimilation (DA) method in conjunction with the eddy-resolving global circulation model is implemented. The results of DA experiments in the North Atlantic with the assimilation of the Archiving, Validation and Interpretation of Satellite Oceanographic (AVISO) data from the Jason-1 satellite are analyzed. The results of simulation are compared with the independent temperature and salinity data from the ARGO drifters. 相似文献
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The formulation and the algorithm of solving an ocean model for the prediction and assimilation of the observed data which makes it possible to reconstruct the circulation in the deep-water parts of the sea and at a shallow water shelf, as well as to describe the large time–space variability in the surface level, are considered. The model uses a vertical hybrid σ–z coordinate system: the several upper tens of meters of the ocean are described in the σ-coordinate system and the rest of the water column is described in the z coordinates. Such hybridization extends the possibilities of models for reconstructing thermo-hydrodynamic processes in different sea basins and the World Ocean. The differential formulation of the model in the σ–z coordinate system is presented; the simplified records of several operators that are allowable in the case of a small thickness of the ocean σ-layer are described. The construction of a computational grid, approximation of the bottom topography on it, and discretization of equations and boundary conditions of the models are considered; an approach to describing the bottom friction at shallow waters is offered. The results of the comparative experiments in the z and σ–z coordinate models are analyzed. 相似文献
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The article proposes parallel implementation of the Ensemble Optimal Interpolation (EnOI) data assimilation (DA) method in eddy-resolving World Ocean circulation model. The results of DA experiments in North Atlantic with ARGO drifters are compared with the multivariate optimal interpolation (MVOI) DA scheme. The sensitivity of the model error, i.e., the difference between the model and observations depending on the number of ensemble elements, is also assessed and presented. The effectiveness of this method over the MVOI scheme is confirmed. The model outputs with and without assimilation are also compared with independent sea surface temperature data from ARMOR 3d. 相似文献
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V. G. Bondur R. A. Ibrayev Yu. V. Grebenyuk G. A. Sarkisyan 《Izvestiya Atmospheric and Oceanic Physics》2008,44(2):225-235
The fields of currents in open basins are studied with the use of a mathematical model of ocean hydrodynamics. The area of the Hawaiian Islands is taken as an example. The model, based on three-dimensional equations of thermohydrodynamics, is solved for a domain with open boundaries, at which adaptive boundary conditions are set. We analyze the results of numerical experiments with given monthly mean climatic conditions at the ocean surface and open lateral boundaries with consideration for tides M 2 and K 1. A comparison of the model solutions and observational data shows that the model can realistically reproduce the mean parameters of the ocean state and their variability. The model solutions for the given area were found to have a northward current in the upper oceanic layer. This current clearly manifests itself in averaged fields. The characteristics of averaged currents indicate that the upper 100–150-m layer between the islands of Hawaii and Maui as well as between the islands of Molokai and Oahu is characterized by water transport from the west to the east side of the ridge of islands. The results obtained and the model proposed can be used to monitor physical fields of the ocean. 相似文献
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V. V. Knysh R. A. Ibrayev G. K. Korotaev N. V. Inyushina 《Izvestiya Atmospheric and Oceanic Physics》2008,44(2):236-249
We present the results of an analysis of the seasonal variability of current fields in the Caspian Sea, reconstructed by assimilation of climatic temperature and salinity into the primitive-equation model of water circulation on the basis of an algorithm for adaptive statistics of prediction errors. The sources in heat and salt transfer-diffusion equations depend on the spatial and temporal variability of the variances of prediction errors and one-dimensional (in the vertical coordinate) variances of measurement errors for temperature and salinity. The variances of prediction errors are adjusted at the moments of data assimilation in accordance with a simplified Kalman filter. The climatic circulation of waters in the Caspian Sea is shown to be highly varying. The maximum of its intensity over the entire depth is reached in February. The minimum of kinetic energy is observed in April. The currents in deep-sea areas are determined by the balance between wind and baroclinic factors of the formation of circulation with wind currents prevalent. 相似文献
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Doklady Earth Sciences - Eddy meridional heat transport (EMHT) in the World Ocean is calculated using the eddy-resolving model. Its distribution is related to intense eddies and forms several... 相似文献
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Seasonal Variability of Water and Sea-Ice Circulation in the Arctic Ocean in a High-Resolution Model
Kalnitskii L. Y. Kaurkin M. N. Ushakov K. V. Ibrayev R. A. 《Izvestiya Atmospheric and Oceanic Physics》2020,56(5):522-533
Izvestiya, Atmospheric and Oceanic Physics - In this work, results of modeling the intra-annual variability of water and ice circulation in the Arctic Ocean by means of the INMIO4.1... 相似文献
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E. M. Volodin A. V. Gusev N. A. Diansky R. A. Ibrayev K. V. Ushakov 《Izvestiya Atmospheric and Oceanic Physics》2018,54(1):86-100
The results of simulations performed by the CORE-II scenario using the two Russian OGCMs, INMOM and INMIO, are presented. The models use different coordinate systems in the basic set of primitive equations and different numerical techniques. Both models are used as oceanic components of the INM RAS coupled models. Simulations have shown that reproducing ocean circulation using both models agrees with observations and simulations by other models. In general, the INMOM slightly underestimates the meridional heat transport in the ocean when compared to the INMIO model and climatic estimations. However, the INMIO yields a higher bias in temperature than the INMOM. 相似文献