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Denis CALLENS


coordonnées


Denis CALLENS
tel +32-2-650.22.15, fax +32-2-650.22.26, Denis.Callens@ulb.ac.be
http://dev.ulb.ac.be/glaciol/denis.html
Campus du Solbosch
CP160/03, avenue F.D. Roosevelt 50, 1050 Bruxelles




unités de recherche


Glaciologie (DSTE-Glaciologie)



projets


IDyRA - Ice Dynamics derived from englacial Radar reflection Architecture [IDyRA - Ice Dynamics derived from englacial Radar reflection Architecture]
IDyRA aims at improving our knowledge of the interaction between the ice sheet and the ice shelf (Antarctic grounding zones). It specifically aims at understanding the processes of subglacial melting and basal sliding by combining englacial information obtained from radio-echo sounding surveys withstate-of-the-art higher-order ice sheet models. This way, numerical ice-sheet models can be validated by reconstructing the internal layer architecture.Grounding lines are key areas in ice sheets and at present subject to much attention. IDyRA will improve the understanding of grounding line migration, ocean interaction, and the role of buttressing in east Dronning Maud Land, Antarctica, where the marine ice sheet is buttressed by numerous ice rises. Results of the project will contribute to a quantitative interpretation ofmelting under the ice shelf, its effect on ice sheet behavior and the effectof a thermohaline circulation under the ice shelf. [IDyRA aims at improving our knowledge of the interaction between the ice sheet and the ice shelf (Antarctic grounding zones). It specifically aims at understanding the processes of subglacial melting and basal sliding by combining englacial information obtained from radio-echo sounding surveys withstate-of-the-art higher-order ice sheet models. This way, numerical ice-sheet models can be validated by reconstructing the internal layer architecture.Grounding lines are key areas in ice sheets and at present subject to much attention. IDyRA will improve the understanding of grounding line migration, ocean interaction, and the role of buttressing in east Dronning Maud Land, Antarctica, where the marine ice sheet is buttressed by numerous ice rises. Results of the project will contribute to a quantitative interpretation ofmelting under the ice shelf, its effect on ice sheet behavior and the effectof a thermohaline circulation under the ice shelf.]

BELISSIMA (Mesures Belges sur les Ice Sheet et Ice Shelves en Antarctique) [BELISSIMA (Belgian Ice Sheet-Ice Shelves Measurements in Antarctica)]
Le projet BELISSIMA (Belgian Ice Sheet-Ice Shelves Measurements in Antarctica)cherche à améliorer notre perception et capacité de prédiction de la contribution cryosphérique au relèvement du niveau marin. les objectifs sont doubles: i) analyser l'histoire de la déglaciation et la stabilité des ''ice rises'' (ilots océaniques où les plateformes de glace flottantes sont contraintes dans leurs déplacements), et ii)mieux comprendre le rôle des interactions glace-océan dans la stabilité du système ice-sheet/ice shelf. Le projet s'insère dans le contexte de la nouvelle Base belge Princesse Elisabeth (Antarctica),et la zone d'étude est localisée dans la zone côtière qui s'étend 180 km au Nord de la station (Princess Ragnhild Coast, Dronning Maud Land, où un nombre d'ice rises ont été dénombrés. les mesures de terrain combinent mesures radar au travers de la glace, au sol (Radio échosondage),GPS différentiel et carottages glaciaires. Une analyse multi-paramétrique des caractéristiques physico-chimiques de la glace est réalisée sur les échantillons. Par ailleurs, les données radar et GPS sont analysées en utilisant les techniques les plus récentes et des outils de modélisation. [The BELISSIMA (Belgian Ice Sheet ' Shelf Ice Measurements in Antarctica) project aims at improving our understanding and prediction of the cryospheric contribution to future sea level rise. The objectives are twofold: i) to investigate the deglaciation history and stability of ice rises (points where the ice shelf gets buttressed), and (ii) to investigate the role of ice-ocean interactions in the stability of the ice sheet ' ice shelf system. The project is within the framework of the newly established Princess Elisabeth Station (Antarctica) and the studied area is situated on the coastal stretch (Princess Ragnhild Coast, Dronning Maud Land), 180 km north from the research station, where a number of distinct ice rises have been identified. Field investigations are based on ground based ice-penetrating radar (Radio-echo sounding), differential GPS and ice core drilling. A multi-parametric analysis of the physical and chemical properties of the ice is carried out on the acquired samples. RES and D-GPS data are analysed using state-of-the-art techniques and modelling tools.]



disciplines et mots clés déclarés


Glaciologie Sciences de la terre et du cosmos

antarctica base princesse elisabeth calottes glaciaires dynamique glaciaire ice rise marine ice modélisation modélisation glaciaire plateformes de glace flottantes radio echo sondages