Doctoral thesis (Dissertations and theses)
Assimilation of sea surface temperature and sea surface height in a two-way nested primitive equation model of the Ligurian Sea
Barth, Alexander
2004
 

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Keywords :
Numerical modelling; Data Assimilation; Ligurian Sea
Abstract :
[en] A coarse grid primitive equation model of 1/4° resolution is implemented covering the whole Mediterranean Sea. Within this grid a 1/20° resolution model of the Liguro-Provençal basin and the northern part of the Tyrrhenian Sea is embedded. A third fine resolution model of 1/60° is nested in the latter one and simulates the dynamics of the Ligurian Sea. Comparisons between one-way and two-way nesting in representing the Northern Current (NC) are made. This system of nested models is coupled with a simplified Kalman-filter based assimilation method. The state vector for the data assimilation is composed by the temperature, salinity and elevation of the three models. The forecast error is estimated by an ensemble run by perturbing initial conditions and atmospheric forcings. The leading empirical orthogonal functions (EOF) of this ensemble are taken as the error covariance of the model forecast. This error covariance is assumed to be constant in time. Sea surface temperature (SST) and sea surface height (SSH) are assimilated in this system. Data assimilation is also used to couple the hydrodynamic model with a statistical predictor of SST in the Ligurian Sea. The forecast improvement of this hybrid modelling system is shown and applications to operational models are highlighted.
Research center :
MARE - Centre Interfacultaire de Recherches en Océanologie - ULiège
Disciplines :
Earth sciences & physical geography
Author, co-author :
Barth, Alexander  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Océanographie physique
Language :
English
Title :
Assimilation of sea surface temperature and sea surface height in a two-way nested primitive equation model of the Ligurian Sea
Defense date :
2004
Number of pages :
202
Institution :
ULiège - Université de Liège
Degree :
Docteur en Sciences
Promotor :
Beckers, Jean-Marie  ;  Université de Liège - ULiège > Freshwater and OCeanic science Unit of reSearch (FOCUS)
President :
Donnay, Jean-Paul ;  Université de Liège - ULiège > Département de géographie
Jury member :
Delhez, Eric ;  Université de Liège - ULiège > Aérospatiale et Mécanique (A&M)
Weisberg, Robert H.
Tintoré, Joaquin
Brasseur, Pierre
De Mey, Pierre
Rixen, Michel
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since 23 October 2009

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