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Dynamically Constrained Ensemble Perturbations – Application to Tides on the West Florida Shelf : Volume 6, Issue 1 (05/01/2009)

By Barth, A.

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Book Id: WPLBN0004021036
Format Type: PDF Article :
File Size: Pages 30
Reproduction Date: 2015

Title: Dynamically Constrained Ensemble Perturbations – Application to Tides on the West Florida Shelf : Volume 6, Issue 1 (05/01/2009)  
Author: Barth, A.
Volume: Vol. 6, Issue 1
Language: English
Subject: Science, Ocean, Science
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2009
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Weisberg, R. H., Beckers, J., Alvera-Azcárate, A., Barth, A., Rixen, M., Lenartz, F., & Vandenbulcke, L. (2009). Dynamically Constrained Ensemble Perturbations – Application to Tides on the West Florida Shelf : Volume 6, Issue 1 (05/01/2009). Retrieved from http://worldlibrary.net/


Description
Description: GeoHydrodynamics and Environment Research (GHER), MARE, Allée du 6-Août 17, University of Liège, Sart-Tilman B5, 4000 Liège, Belgium. A method is presented to create an ensemble of perturbations that satisfies linear dynamical constraints. A cost function is formulated defining the probability of each perturbation. It is shown that the perturbations created with this approach take the land-sea mask into account in a similar way as variational analysis techniques. The impact of the land-sea mask is illustrated with an idealized configuration of a barrier island. Perturbations with a spatially variable correlation length can be also created by this approach. The method is applied to a realistic configuration of the West Florida Shelf to create perturbations of the M2 tidal parameters for elevation and depth-averaged currents. The perturbations are weakly constrained to satisfy the linear shallow-water equations. Despite that the constraint is derived from an idealized assumption, it is shown that this approach is applicable to a non-linear and baroclinic model. The amplitude of spurious transient motions created by constrained perturbations of initial and boundary conditions is significantly lower compared to perturbing the variables independently or to using only the momentum equation to compute the velocity perturbations from the elevation.

Summary
Dynamically constrained ensemble perturbations – application to tides on the West Florida Shelf

Excerpt
Alvera-Azcárate, A., Barth, A., Beckers, J., and Weisberg, R H.: Multivariate reconstruction of missing data in sea surface temperature, chlorophyll and wind satellite field, J. Geophys. Res., 112, C03008, doi:10.1029/2006JC003660, 2007.; Arakawa, A. and Lamb, V.: A~potential enstrophy and energy conserving scheme for the shallow water equations, Mon. Weather Rev., 109, 18–36, 1981.; Barth,~A., Alvera-Azcárate,~A., Beckers,~J.-M., Rixen,~M., and Vandenbulcke,~L.: Multigrid state vector for data assimilation in a~two-way nested model of the Ligurian Sea, J. Marine Syst., 65, 41–59, doi:10.1016/j.jmarsys.2005.07.006, 2007a.; Barth,~A., Beckers,~J.-M., Alvera-Azcárate,~A., and Weisberg,~R H.: Filtering inertia-gravity waves from the initial conditions of the linear shallow water equations, Ocean Modelling, 19, 204–218, doi:10.1016/j.ocemod.2007.06.007, 2007b.; Egbert,~G. and Erofeeva,~S.: Efficient inverse modeling of barotropic ocean tides, J. Atmos. Ocean. Tech., 19, 183–204, 2002.; Barth,~A., Alvera-Azcárate,~A., and Weisberg,~R H.: Benefit of nesting a~regional model into a~large-scale ocean model instead of climatology. Application to the West Florida Shelf, Continental Shelf Res., 28, 561–573, doi:10.1016/j.csr.2007.11.004, 2008a.; Barth,~A., Alvera-Azcárate,~A., and Weisberg,~R H.: A~nested model study of the Loop Current generated variability and its impact on the West Florida Shelf, J. Geophys. Res., 113, C05009, doi:10.1029/2007JC004492, 2008b.; Barth,~A., Alvera-Azcárate,~A., and Weisberg,~R H.: Assimilation of high-frequency radar currents in a~nested model of the West Florida Shelf, J. Geophys. Res., 113, C08033, doi:10.1029/2007JC004585, 2008c.; Beckers,~J.-M. and Rixen,~M.: EOF calculation and data filling from incomplete oceanographic datasets, J. Atmos. Ocean. Tech., 20, 1839–1856, 2003.; Brankart,~J.-M. and Brasseur,~P.: Optimal analysis of in situ data in the Western Mediterranean using statistics and cross-validation., J. Atmos. Ocean. Tech., 13, 477–491, 1996.; Brankart,~J.-M., Testut,~C E., Brasseur,~P., and Verron,~J.: Implementation of a~multivariate data assimilation scheme for isopycnic coordinate ocean models: application to a~1993–96 hindcast of the North Atlantic Ocean circulation, J. Geophys. Res., 108, 3074, 2003.; Brasseur,~P.: A~variational inverse method for the reconstruction of general circulation fields in the Northern Bering Sea, J. Geophys. Res., 96, 4891–4907, 1991.; Brasseur,~P.: Reconstitution de champs d'observations océanographiques par le Modèle Variationnel Inverse: méthodologie et applications., PhD~thesis, Université de Liège, Collection des publications, Sciences appliquées, 1994.; Brasseur,~P., Beckers,~J.-M., Brankart,~J.-M., and Schoenauen,~R.: Seasonal temperature and salinity fields in the Mediterranean Sea: climatological analyses of an historical data set, Deep-Sea Res., 43, 159–192, 1996.; Dee,~D.: Simplification of the Kalman filter for meteorological data assimilation, Q. J. Roy. Meteor. Soc., 117, 365–384, 1991.; Chassignet,~E P., Hurlburt,~H E., Smedstad,~O M., Halliwell,~G R., Hogan, P J., Wallcraft,~A J., Baraille,~R., and Bleck,~R.: The HYCOM (HYbrid Coordinate Ocean Model) Data Assimilative System, J. Marine Syst., 65, 60–83, 2007.; Dobricic, S., Pinardi, N., Adani, M., Tonani, M., Fratianni, C., Bonazzi, A., and Fernandez, V.: Daily oceanographic analyses by Mediterranean Forecasting System at the basin scale, Ocean Sci., 3, 149–157, 2007.; Egbert,~G., Bennett,~A., and Foreman,~M.: TOPEX/POSEIDON tides estimated using a~global inverse model, J. Geophys. Res., 99, 24821–24852, 1994.; Evensen,~G.: The Ensemble Kalman Filter: theoretical formulation and practical implementation, Ocean Dynam., 53, 343–367, 2003.; He,~R. and Weisberg,~R H.: Tides on the West Florida Shelf, J. Phys. Oceanogr., 32, 3455–3473, 2002.; Kalnay,~E.: Atmospheric Modeling, Data Assimilation and Predictability, 1st edn., Cambridge University Press, 2002.; Lehoucq,~R B., Sorensen,~D C., and Yang

 

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