COMPARISON OF TWO DATA ASSIMILATION METHODS USED TO ACCOUNT FOR OPEN BOUNDARIES IN SEA AREA HYDROTHERMODYNAMICS MODELING

  • T. O. Sheloput Marchuk Institute of Numerical Mathematics of the Russian Academy of Sciences
  • V. I. Agoshkov Lomonosov Moscow State University
DOI 10.29006/1564-2291.JOR-2021.49(4).4
Keywords variational data assimilation, modeling of marine systems, open boundaries, satellite altimetry, barotropic velocities, numerical methods, inverse problems

Abstract

The problems of modeling hydrothermodynamics of particular sea and coastal areas are of current interest, since the results of this modeling are often used in many applications. One of the methods allowing to take into account open boundaries and bring the simulation results closer to real data is the variational assimilation of observational data. In this paper the following approach is considered: it is supposed that there are observational data at a certain moment in time; the problem is considered as an inverse problem, in which the functions of fluxes across the open boundary are treated as additional unknowns. Comparison of methods for reconstructing unknown functions in boundary conditions at an open boundary using sea level and velocity observational data in a number of numerical experiments for a region of a simple shape is carried out.

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Published
2021-12-30
Issue
Vol 49 No 4 (2021): Journal of Oceanological Research
Section
Ocean physics and climate

Transfer of copyrights occurs on the basis of a license agreement between the Author and Shirshov Institute of Oceanology, RAS