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With global warming, supra-glacial lakes (SGLs) are increasingly widespread on the Greenland Ice Sheet (GrIS) due to enhanced meltwater runoff and ablation zone extension. However, SGLs as well as all associated hydrology are currently neglected by models simulating the evolution of the Surface Mass Balance (SMB) of the ice sheets. These models assume that meltwater runoff is directly transferred to the ocean as soon as the snowpack is liquid water-saturated, regardless of the location of this meltwater on the ice sheet or topography. Nevertheless, the presence of SGLs on the surface of the ice influences the SMB. Notably by its predisposition to retain liquid water (that could refreeze in winter) or to generate extra evaporation in summer or by its low surface albedo, locally increasing the absorption of solar energy.
To evaluate the importance of SGLs as a potentially significant SMB component, we ran MARv3.14 at high resolution (5km×5km) over South-West Greenland for the 2018-2019 hydrological year. We conducted sensitivity experiments to examine the effects of this surface water on bare ice albedo, evaporation, meltwater retention, and atmospheric feedback. Surface meltwater in the ablation zone was allowed to remain liquid or solid in bare ice areas where SGLs were detected by satellite. Additionally, we carried out a quantitative study of SGLs in Greenland
using primarily LANDSAT 8 data.
We conclude that modifying the runoff parameters in the Modèle Atmosphérique Régional (MAR) model can significantly alter the modelled SMB. Also, improving the treatment of runoff in the model is essential for better quantifying the impact of supraglacial hydrology on the SMB.

MAR --- SMB --- Greenland Ice Sheet --- Supra-glacial Lakes --- Physique, chimie, mathématiques & sciences de la terre > Sciences de la terre & géographie physique

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An eminent philosopher explains why we owe it to future generations to take immediate action on global warmingClimate change is the supreme challenge of our time. Yet despite growing international recognition of the unfolding catastrophe, global carbon emissions continue to rise, hitting an all-time high in 2019. Unless humanity rapidly transitions to renewable energy, it may be too late to stop irreversible ecological damage. In The Pivotal Generation, renowned political philosopher Henry Shue makes an impassioned case for taking immediate, radical action to combat global warming.Shue grounds his argument in a rigorous philosophical analysis of climate change’s moral implications. Unlike previous generations, which didn’t fully understand the danger of burning carbon, we have the knowledge to comprehend and control rising carbon dioxide levels. And unlike future generations, we still have time to mitigate the worst effects of global warming. This generation has the power, and thus the responsibility, to save the planet. Shirking that responsibility only leaves the next generation with an even heavier burden—one they may find impossible to bear.Written in direct, accessible language, The Pivotal Generation approaches the latest scientific research with a singular moral clarity. It’s an urgently needed call to action for anyone concerned about the planet’s future.

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