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Le manteau neigeux situé en surface de la calotte du Groenland est d’une importance majeure en ce qui concerne le sort des eaux de fonte générées en surface. Celui-ci a en effet la capacité de retenir une partie de cette eau, limitant ainsi l’augmentation du niveau global des mers. À la lumière des récents évènements de fonte ayant atteint les zones les plus hautes de la calotte du Groenland, se pose la question de la durée pendant laquelle le manteau pourra encore jouer ce rôle. Allons-nous, dans un horizon plus ou moins proche assister à une saturation de ce manteau même aux plus hautes altitudes, ce qui limiterait la capacité de rétention de ce dernier ? Pour réaliser des projections et répondre à cette question, les modèles climatiques régionaux comme le MAR peuvent être utilisés. Cependant, avant toute chose, il est intéressant de voir dans quelle mesure ces modèles peuvent être sensibles à différents paramètres qui régissent la capacité de rétention du manteau neigeux de la calotte du Groenland. Ainsi, ce mémoire propose une discussion de l’impact qu’ont différents paramètres sur la façon dont est projetée la capacité de rétention du manteau.
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Melt takes place where the surface of glaciers or ice sheets interacts with the atmosphere. While the processes governing surface melt are fairly well understood, the pathways of the meltwater, from its origin to the moment it leaves a glacier system, remain enigmatic. It is not even guaranteed that meltwater leaves a glacier or ice sheet. On Greenland, for example, only slightly more than 50% of the meltwater runs off. The remainder mostly refreezes within the so-called firn cover of the ice sheet. This eBook contains 11 studies which tackle the challenge of understanding meltwater retention in snow and firn from various angles. The studies focus both on mountain glaciers and on the Greenland ice sheet and address challenges such as measuring firn properties, quantifying their influence on meltwater retention, modelling firn processes and meltwater refreezing as well as unravelling the mechanisms within the recently discovered Greenland firn aquifers.
firn --- regional climate model --- expert elicitation --- refreezing --- mass balance --- Meltwater retention --- snow --- Greenland firn aquifer --- glacier and ice sheet --- sea level rise
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Melt takes place where the surface of glaciers or ice sheets interacts with the atmosphere. While the processes governing surface melt are fairly well understood, the pathways of the meltwater, from its origin to the moment it leaves a glacier system, remain enigmatic. It is not even guaranteed that meltwater leaves a glacier or ice sheet. On Greenland, for example, only slightly more than 50% of the meltwater runs off. The remainder mostly refreezes within the so-called firn cover of the ice sheet. This eBook contains 11 studies which tackle the challenge of understanding meltwater retention in snow and firn from various angles. The studies focus both on mountain glaciers and on the Greenland ice sheet and address challenges such as measuring firn properties, quantifying their influence on meltwater retention, modelling firn processes and meltwater refreezing as well as unravelling the mechanisms within the recently discovered Greenland firn aquifers.
firn --- regional climate model --- expert elicitation --- refreezing --- mass balance --- Meltwater retention --- snow --- Greenland firn aquifer --- glacier and ice sheet --- sea level rise
Choose an application
Melt takes place where the surface of glaciers or ice sheets interacts with the atmosphere. While the processes governing surface melt are fairly well understood, the pathways of the meltwater, from its origin to the moment it leaves a glacier system, remain enigmatic. It is not even guaranteed that meltwater leaves a glacier or ice sheet. On Greenland, for example, only slightly more than 50% of the meltwater runs off. The remainder mostly refreezes within the so-called firn cover of the ice sheet. This eBook contains 11 studies which tackle the challenge of understanding meltwater retention in snow and firn from various angles. The studies focus both on mountain glaciers and on the Greenland ice sheet and address challenges such as measuring firn properties, quantifying their influence on meltwater retention, modelling firn processes and meltwater refreezing as well as unravelling the mechanisms within the recently discovered Greenland firn aquifers.
firn --- regional climate model --- expert elicitation --- refreezing --- mass balance --- Meltwater retention --- snow --- Greenland firn aquifer --- glacier and ice sheet --- sea level rise
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