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Dive into the research topics where S. Ponsar is active.

Publication


Featured researches published by S. Ponsar.


Ocean Dynamics | 2016

Data assimilation with the ensemble Kalman filter in a numerical model of the North Sea

S. Ponsar; Patrick Luyten; Valérie Dulière

Coastal management and maritime safety strongly rely on accurate representations of the sea state. Both dynamical models and observations provide abundant pieces of information. However, none of them provides the complete picture. The assimilation of observations into models is one way to improve our knowledge of the ocean state. Its application in coastal models remains challenging because of the wide range of temporal and spatial variabilities of the processes involved. This study investigates the assimilation of temperature profiles with the ensemble Kalman filter in 3-D North Sea simulations. The model error is represented by the standard deviation of an ensemble of model states. Parameters’ values for the ensemble generation are first computed from the misfit between the data and the model results without assimilation. Then, two square root algorithms are applied to assimilate the data. The impact of data assimilation on the simulated temperature is assessed. Results show that the ensemble Kalman filter is adequate for improving temperature forecasts in coastal areas, under adequate model error specification.


Ocean Dynamics | 2009

Data assimilation with the EnKF in a 1-D numerical model of a North Sea station

S. Ponsar; Patrick Luyten


Climate Services | 2018

The CORDEX.be initiative as a foundation for climate services in Belgium

Piet Termonia; Bert Van Schaeybroeck; Lesley De Cruz; Rozemien De Troch; Steven Caluwaerts; Olivier Giot; Rafiq Hamdi; Stéphane Vannitsem; François Duchêne; Patrick Willems; Hossein Tabari; Els Van Uytven; Parisa Hosseinzadehtalaei; Nicole Van Lipzig; Hendrik Wouters; Sam Vanden Broucke; Jean-Pascall Van Ypersele; Philippe Marbaix; Cecille Villanueva-Birriel; Xavier Fettweis; Coraline Wyard; Chloé Scholzen; Sébastien Doutreloup; Koen De Ridder; Anne Gobin; Dirk Lauwaet; Trissevgeni Stavrakou; Maite Bauwens; Jean-François Müller; Patrick Luyten


Ocean Dynamics | 2011

Combined model state and parameter estimation with an ensemble Kalman filter in a North Sea station 1-D numerical model

S. Ponsar; Patrick Luyten; Jose Ozer


Archive | 2009

Evaluation of climate change impacts and adaptation responses for marine activities CLIMAR: final report phase 1

D. Van den Eynde; R. De Sutter; L. De Smet; F. Francken; J. Haelters; Frank Maes; Elke Malfait; J. Ozer; Hans Polet; S. Ponsar; J. Reyns; K. Van der Biest; Els Vanderperren; T. Verwaest; A.M. Volckaert; Marian Willekens


Archive | 2017

CORDEX.be - Combining regional downscaling expertise in Belgium: CORDEX and beyond

Piet Termonia; Bert Van Schaeybroeck; Lesley De Cruz; Rozemien De Troch; Olivier Giot; Rafiq Hamdi; Stéphane Vannitsem; Patrick Willems; Hossein Tabari; Els Van Uytven; Parisa Hosseinzadehtalaei; Nicole Van Lipzig; Hendrik Wouters; Sam Vanden Broucke; Jean-Pascal van Ypersele; Philippe Marbaix; Cecille Villanueva-Birriel; Xavier Fettweis; Coraline Wyard; Chloé Scholzen; Sébastien Doutreloup; K. De Ridder; Anne Gobin; D. Lauwaet; Trissevgeni Stavrakou; Maite Bauwens; J-F. Müller; P. Luyten; S. Ponsar; D. Van den Eynde


Archive | 2016

Estimation of model error prior to long term simulations of climate change impact on storm surges and waves at the Belgian Continental Shelf

S. Ponsar; P. Luyten; D. Van den Eynde


Archive | 2015

Combining the regional downscaling expertise in Belgium: CORDEX and beyond

Piet Termonia; Bert Van Schaeybroeck; Lesley De Cruz; Rozemien De Troch; Olivier Giot; Rafiq Hamdi; Stéphane Vannitsem; François Duchêne; Patrick Willems; Hossein Tabari; Els Van Uytven; Parisa Hosseinzadehtalaei; Nicole Van Lipzig; Hendrik Wouters; Sam Vanden Broucke; Matthias Demuzere; Jean-Pascal van Ypersele; Philippe Marbaix; Cecille Villanueva-Birriel; Xavier Fettweis; Coraline Wyard; Chloé Scholzen; Sébastien Doutreloup; Koen De Ridder; Dirk Lauwaet; Anne Gobin; Trissevgeni Stavrakou; Maite Bauwens; Jean-François Müller; P. Luyten


VLIZ Special Publication | 2011

Assessment of primary impacts of global climate changes at the Belgian part of the North Sea

D. Van den Eynde; J. Ozer; S. Ponsar


Archive | 2008

CLIMAR - Evaluatie van de impacts van klimaatverandering en aanpassingsmaatregelen voor mariene activiteiten

D. Van den Eynde; R. De Sutter; Frank Maes; J. Ozer; Hans Polet; S. Ponsar; K. Van der Biest; Els Vanderperren; T. Verwaest; A.M. Volckaert

Collaboration


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Bert Van Schaeybroeck

Royal Meteorological Institute

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Cecille Villanueva-Birriel

Université catholique de Louvain

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D. Van den Eynde

Royal Belgian Institute of Natural Sciences

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Els Van Uytven

Katholieke Universiteit Leuven

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Hendrik Wouters

Katholieke Universiteit Leuven

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Hossein Tabari

Katholieke Universiteit Leuven

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