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Assimilating data into open ocean tidal models

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Abstract

The problem of deriving tidal fields from observations by reason of incompleteness and imperfectness of every data set practically available has an infinitely large number of allowable solutions fitting the data within measurement errors and hence can be treated as ill-posed. Therefore, interpolating the data always relies on some a priori assumptions concerning the tides, which provide a rule of sampling or, in other words, a regularization of the ill-posed problem. Data assimilation procedures used in large scale tide modeling are viewed in a common mathematical framework as such regularizations. It is shown that they all (basis functions expansion, parameter estimation, nudging, objective analysis, general inversion, and extended general inversion), including those (objective analysis and general inversion) originally formulated in stochastic terms, may be considered as utilizations of one of the three general methods suggested by the theory of ill-posed problems. The problem of grid refinement critical for inverse methods and nudging is discussed.

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Authors and Affiliations

  1. St. Petersburg Branch, Shirshov Institute of Oceanology, Russian Academy of Sciences 30, 1 Liniya, 199053, St. Petersburg, Russia

    Gennady A. Kivman

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Kivman, G.A. Assimilating data into open ocean tidal models. Surveys in Geophysics 18, 621–643 (1997). https://doi.org/10.1023/A:1006535821489

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