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Inverse Model for Limited-Area Hindcasts on the Continental Shelf **

Inverse Model for Limited-Area Hindcasts on the Continental Shelf ** The authors have constructed an inverse model for interpreting subtidal velocity observations in a limited-area hindcasting context. The intended use is following removal of a best prior circulation estimate that accounts for tide, local baroclinicity, and the direct response to local wind forcing. The remaining, subtidal velocity signal is inverted to provide far-field subtidal pressure forcing. The forward portion of the model is a linearization of a full-physics 3D simulator (QUODDY). Its inversion is achieved by gradient descent, using an exact algebraic adjoint and strong dynamical constraints. The cost function is a weighted least squares blend of velocity mismatch plus boundary condition size, slope, and tendency. The control parameters are barotropic open-water boundary conditions. Solution is achieved in the time domain, as a complement to the frequency-domain ““detiding”” inversion presented earlier. A simple test case is introduced to demonstrate features of the inversion: precision, accuracy, interpolation, and extrapolation. A representative application on realistic topography (Georges Bank) is given. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Atmospheric and Oceanic Technology American Meteorological Society

Inverse Model for Limited-Area Hindcasts on the Continental Shelf **

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Publisher
American Meteorological Society
Copyright
Copyright © 1999 American Meteorological Society
ISSN
1520-0426
DOI
10.1175/1520-0426(2001)018<0962:IMFLAH>2.0.CO;2
Publisher site
See Article on Publisher Site

Abstract

The authors have constructed an inverse model for interpreting subtidal velocity observations in a limited-area hindcasting context. The intended use is following removal of a best prior circulation estimate that accounts for tide, local baroclinicity, and the direct response to local wind forcing. The remaining, subtidal velocity signal is inverted to provide far-field subtidal pressure forcing. The forward portion of the model is a linearization of a full-physics 3D simulator (QUODDY). Its inversion is achieved by gradient descent, using an exact algebraic adjoint and strong dynamical constraints. The cost function is a weighted least squares blend of velocity mismatch plus boundary condition size, slope, and tendency. The control parameters are barotropic open-water boundary conditions. Solution is achieved in the time domain, as a complement to the frequency-domain ““detiding”” inversion presented earlier. A simple test case is introduced to demonstrate features of the inversion: precision, accuracy, interpolation, and extrapolation. A representative application on realistic topography (Georges Bank) is given.

Journal

Journal of Atmospheric and Oceanic TechnologyAmerican Meteorological Society

Published: Dec 2, 1999

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