Description du projet
Prévoir les points de basculement des glaciers: des simulations numériques de l’océan intégrant la turbulence
Les glaciers, grandes nappes de glace et de neige liées à la terre, sont des sentinelles du changement climatique, qui rétrécissent ou disparaissent rapidement. Leurs plateaux de glace, des langues glacées qui s’étendent dans l’océan, protègent la glace terrestre de la fonte. Avec le réchauffement des océans, les plateaux de glace fondent et s’effondrent plus rapidement, supprimant ainsi cette protection. La compréhension des interactions dynamiques qui sous-tendent ces processus est limitée, mais il est urgent d’aider à prévoir si des points de basculement seront franchis au cours de ce siècle, et à quel moment. Avec le soutien du programme Actions Marie Skłodowska-Curie, le projet GLmelt comblera cette lacune en élaborant des simulations de grand tourbillon à haute résolution axées sur les régions océaniques proches de la ligne d’ancrage entre le glacier et son plateau de glace.
Objectif
Ice shelf melting and retreat are accelerating in polar regions because the warm off-shore waters are gaining greater access to the base of ice shelves. Warm waters have the potential of reaching the grounding line and thereby melting it causing the retreat of the full ice shelf, resulting in elevated rates of ice discharge into polar seas and sea level rise. The interconnection between ocean conditions, warming, and ice melting in ice-shelf cavities is poorly understood due to the paucity of observations and turbulence-resolving simulations. This knowledge gap hinders future projections of ice changes and makes it impossible to predict if and when tipping points will be crossed within the 21st century, as their timing critically depends on the details of ice-ocean interactions. GLmelt aims to fill the critical knowledge gap pertaining to the relationship between ice melting rate and ocean conditions by running numerical simulations capable of resolving turbulence. They focus on near-grounding-line regions where ice sheet sensitivity to ice melting is greatest. GLmelt objectives are:
1. Developing an open-source numerical model capable of resolving under-ice ocean dynamics near grounding lines
2. Investigating melt rate distributions considering a range of ice-shelf cavity configurations found in nature
3. Investigating how the characteristic melt rate distributions vary with problem parameters in quiescent ocean conditions
4. Quantifying the effect of long-shore currents
5. Organizing a workshop reviewing state-of-the-art knowledge in dynamical processes controlling basal ice melting and guiding practices in choosing melting parameterizations
GLmelt will enable the candidate fellow to deliver high-impact research outcomes to the research community, environmental policymakers, and the public while receiving high-quality training from world-leading institutes in hydrodynamic turbulence and polar sciences, which will help him secure a permanent research position.
Mots‑clés
Programme(s)
- HORIZON.1.2 - Marie Skłodowska-Curie Actions (MSCA) Main Programme
Appel à propositions
(s’ouvre dans une nouvelle fenêtre) HORIZON-MSCA-2022-PF-01
Voir d’autres projets de cet appelRégime de financement
HORIZON-TMA-MSCA-PF-EF - HORIZON TMA MSCA Postdoctoral Fellowships - European FellowshipsCoordinateur
69342 Lyon
France