Correcting surface winds by assimilating High-Frequency Radar surface currents in the German Bight

Barth, Alexander; Alvera Azcarate, Aïda; Beckers, Jean-Marie; Staneva, Joanna; Emil V., Stanev; Johannes, Schulz-Stellenfleth

doi:10.1007/s10236-010-0369-0

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Correcting surface winds by assimilating High-Frequency Radar surface currents in the German Bight

Barth, Alexander; Alvera Azcarate, Aïda; Beckers, Jean-Marie et al.

2011 • In Ocean Dynamics, 61 (5), p. 599-610

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https://hdl.handle.net/2268/83330

DOI
10.1007/s10236-010-0369-0

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Keywords :

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 Center/Unit :

MARE - Centre Interfacultaire de Recherches en Océanologie - ULiège
GeoHydrodynamics and Environment Research
Département d'Astrophysique, Géophysique et Océanographie

Disciplines :

Earth sciences & physical geography

Author, co-author :

Barth, Alexander ; Université de Liège - ULiège > 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 - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > GeoHydrodynamics and Environment Research (GHER)

Beckers, Jean-Marie ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > GeoHydrodynamics and Environment Research (GHER)

Staneva, Joanna

Emil V., Stanev

Johannes, Schulz-Stellenfleth

Language :

English

Title :

Correcting surface winds by assimilating High-Frequency Radar surface currents in the German Bight

Publication date :

2011

Journal title :

Ocean Dynamics

ISSN :

1616-7341

eISSN :

1616-7228

Publisher :

Springer Science & Business Media B.V., Heidelberg, Germany

Volume :

Issue :

Pages :

599-610

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

http://modb.oce.ulg.ac.be/mediawiki/upload/Alex/CV/Barth10_Ocean_Dynamics_AssimWinds.pdf

Name of the research project :

European COastal-shelf sea OPerational observing and forecasting system (ECOOP)

Funders :

F.R.S.-FNRS - Fonds de la Recherche Scientifique

Available on ORBi :

since 01 February 2011

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