ORBi: Barth Alexander - Dynamically constrained ensemble perturbations - application to tides on the West Florida Shelf

Reference : Dynamically constrained ensemble perturbations - application to tides on the West Florid...


	Document type :	Scientific journals : Article
	Discipline(s) :	Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography
	To cite this reference:	http://hdl.handle.net/2268/28800

Title :	Dynamically constrained ensemble perturbations - application to tides on the West Florida Shelf
Language :	English
Author, co-author :	Barth, Alexander [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Océanographie physique >]
	Alvera Azcarate, Aïda [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > GeoHydrodynamics and Environment Research (GHER) >]
	Beckers, Jean-Marie [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Océanographie physique >]
	Weisberg, R. H. [University of South Florida > College of Marine Science > Ocean Circulation Group > >]
	Vandenbulcke, Luc [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Océanographie physique >]
	Lenartz, Fabian [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO) >]
	Rixen, Michel [NATO Undersea Research Centre > > > >]
Publication date :	2009
Journal title :	Ocean Science
Publisher :	European Geosciences Union
Volume :	5
Issue/season :	3
Pages :	259-270
Peer reviewed :	Yes (verified by ORBi)
Audience :	International
ISSN :	1812-0784
Keywords :	[en] Ensemble ; Data Assimilation ; Modelling
Abstract :	[en] 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.
Funders :	Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS
Target :	Researchers
Permalink :	http://hdl.handle.net/2268/28800
Other URL :	http://www.ocean-sci.net/5/259/2009/

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