Objectif "The arctic regions are expected to experience the most profound impacts of the ongoing global warming. Some alarming observations have recently been reported by the Arctic Climate Impact Assessment group, such as reduced sea ice cover or freshening of the Arctic Ocean. One of the most striking features is the rapid wastage of glaciers and ice caps. Improved knowledge of the evolution of these glaciers toward the end of this century is crucial as they significantly contribute to water resources, sea level r ise. We propose in this project to use a combined modelling and remote sensing approach to assess the past, present and future evolution of the glaciers and icefields of northwest North America with special emphasis of those in the Yukon (Canada) and Alask a (USA). This goal will be achieved through the development and validation of a new Regional land Ice Dynamics Model (RIDM). A two-step approach is planned:The first step of the project is the development and validation of the RIDM under the well known 20t h century climate forcing and glacier response. Remote sensing measurements will play a major role by providing:1. Boundary conditions for the model. In particular, we will develop a method to retrieve the subglacial topography in regions that are currentl y ice-covered using satellite-derived velocity fields.2. Tight constraints on model performance. We will test the capability of the model to reproduce the present day ice cover and ice flow dynamic.In a second step, we will run the RIDM under different cli mate condition. First, we will force our model with surface temperature and precipitation fields derived from paleoarchives, including ice-core climate records from Mt. Logan (5960 m asl) to study the evolution of the Yukon/Alaska glaciers during the Holo cene (past ~10000 yr). Then, we will use scenarios of greenhouse gas induced global warming to assess the mass loss and associated sea level rise contribution of these glaciers." Champ scientifique natural sciencesearth and related environmental sciencesatmospheric sciencesclimatologyclimatic zonesnatural sciencesearth and related environmental scienceshydrologynatural sciencesphysical sciencesastronomyplanetary sciencesplanetary geologyengineering and technologyenvironmental engineeringremote sensingnatural sciencesearth and related environmental sciencesatmospheric sciencesclimatologyclimatic changes Mots‑clés Glaciology Ice Dynamics Regional modelling Sea Level Rise Programme(s) FP6-MOBILITY - Human resources and Mobility in the specific programme for research, technological development and demonstration "Structuring the European Research Area" under the Sixth Framework Programme 2002-2006 Thème(s) MOBILITY-2.2 - Marie Curie Outgoing International Fellowships (OIF) Appel à propositions FP6-2004-MOBILITY-6 Voir d’autres projets de cet appel Régime de financement IIF - Marie Curie actions-Incoming International Fellowships Coordinateur CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE Contribution de l’UE Aucune donnée Adresse Michel Ange, 3 PARIS France Voir sur la carte Liens Site web Opens in new window Coût total Aucune donnée Participants (1) Trier par ordre alphabétique Trier par contribution de l’UE Tout développer Tout réduire THE UNIVERSITY OF BRITISH COLUMBIA Canada Contribution de l’UE Aucune donnée Adresse 2075 Wesbrook Mall, Attention to: 103-6190 Agronomy Road, VANCOUVER, BRITISH COLUMBIA Voir sur la carte Liens Site web Opens in new window Coût total Aucune donnée