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UMR 5672

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Subglacial Hydrodynamics and Ice-Water Interactions

Louis-Alexandre Couston (Laboratoire de Physique, ENS de Lyon)
Quand ? Le 18/10/2021,
de 11:00 à 12:00
Où ? Amphi Descartes
Participants Louis-Alexandre Couston
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Ice and liquid water coexist and interact on planets and moons throughout the solar system. Understanding the dynamics and evolution of ice-water systems is important to planetary climates and astrobiology. In this talk, I will discuss two topics related to ice-water interactions: (i) the melting of Earth's cryosphere, and (ii) the dynamics of Antarctic subglacial lakes, which may be considered as terrestrial analogues of subglacial water pockets on icy moons. Using high-resolution simulations of idealized physical models of subglacial hydrodynamics and phase changes, I will present recent results on (i) the topography of ice-water interfaces at the base of ice shelves surrounding the Antarctic peninsula, and (ii) the intensity of turbulent convection in enclosed subglacial lakes. I will discuss the implications of these results on the prediction of ice melt rates and the dispersion of particulates (sediments, microorganisms) in subglacial environments.


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