ORBi: Barth Alexander - Correcting surface winds by assimilating High-Frequency Radar surface currents in the German Bight

Reference : Correcting surface winds by assimilating High-Frequency Radar surface currents in the Ge...


	Document type :	Scientific journals : Article
	Discipline(s) :	Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography
	To cite this reference:	http://hdl.handle.net/2268/83330

Title :	Correcting surface winds by assimilating High-Frequency Radar surface currents in the German Bight
Language :	English
Author, co-author :	Barth, Alexander [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > GeoHydrodynamics and Environment Research (GHER) - Département d'astrophys., géophysique et océanographie (AGO) >]
	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) > GeoHydrodynamics and Environment Research (GHER) >]
	Staneva, Joanna [> >]
	Emil V., Stanev [> >]
	Johannes, Schulz-Stellenfleth [> >]
Publication date :	2011
Journal title :	Ocean Dynamics
Publisher :	Springer Science & Business Media B.V.
Volume :	61
Issue/season :	5
Pages :	599-610
Audience :	International
ISSN :	1616-7341
City :	Heidelberg
Country :	Germany
Keywords :	[en] ocean modelling ; data assimilation ; German Bight
Abstract :	[en] Surface winds are crucial for accurately modeling the surface circulation in the coastal ocean. In the present work, high-frequency (HF) radar surface currents are assimilated using an ensemble scheme which aims to obtain improved surface winds taking into account ECMWF (European Centre for Medium-Range Weather Forecasts) winds as a first guess and surface current measurements. The objective of this study is to show that wind forcing can be improved using an approach similar to parameter estimation in ensemble data assimilation. Like variational assimilation schemes, the method provides an improved wind field based on surface current measurements. However, the technique does not require an adjoint and it is thus easier to implement. In addition, it does not rely on a linearization of the model dynamics. The method is validated directly by comparing the analyzed wind speed to independent in situ measurements and indirectly by assessing the impact of the corrected winds on model sea surface temperature (SST) relative to satellite SST.
Research units :	Centre Interfacultaire de Recherches en Océanologie - MARE ; GeoHydrodynamics and Environment Research ; Département d'Astrophysique, Géophysique et Océanographie
Funders :	Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS
Name of the research project :	European COastal-shelf sea OPerational observing and forecasting system (ECOOP)
Target :	Researchers ; Professionals ; Students
Permalink :	http://hdl.handle.net/2268/83330
DOI :	10.1007/s10236-010-0369-0
Other URL :	http://modb.oce.ulg.ac.be/mediawiki/upload/Alex/CV/Barth10_Ocean_Dynamics_AssimWinds.pdf

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