Forecast Model Bias Correction in Ocean Data Assimilation
- 1 May 2005
- journal article
- Published by American Meteorological Society in Monthly Weather Review
- Vol. 133 (5), 1328-1342
- https://doi.org/10.1175/mwr2920.1
Abstract
Numerical models of ocean circulation are subject to systematic errors resulting from errors in model physics, numerics, inaccurately specified initial conditions, and errors in surface forcing. In addition to a time-mean component, the systematic errors include components that are time varying, which could result, for example, from inaccuracies in the time-varying forcing. Despite their importance, most assimilation algorithms incorrectly assume that the forecast model is unbiased. In this paper the authors characterize the bias for a current assimilation scheme in the tropical Pacific. The characterization is used to show how relatively simple empirical bias forecast models may be used in a two-stage bias correction procedure to improve the quality of the analysis.Keywords
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