PMMH’s weekly seminar is held every Friday at 11 am (map)
Sylvain Patinet
Stéphane Perrard
Etienne Reyssat
Virgile Thiévenaz
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PMMH
BARRE CASSAN
BAT A 1ER ETAGE CASE 18
7 QUAI SAINT BERNARD
75005 PARIS
France
Tel : (33) 1 40 79 45 22
Séminaire PMMH - Louis-Alexandre Couston (ENS Lyon)
What we know and don't know about the ocean circulation and ice melting around Antarctica
The Antarctic ice sheet is losing mass increasingly rapidly and could
contribute several tens of centimetres of sea-level rise by 2100. In
this presentation I will review our understanding of the southern ocean
circulation, which (we know) is controlling ice melting around
Antarctica and driving the retreat of the ice sheet. I will describe the
ocean dynamics at both large and small scales. Notably, I will explain
why the ocean circulation below ice shelves (floating extensions of the
ice sheet, hundreds of kilometres long) may tip from cold to warm
conditions abruptly. Then, I will review the different (turbulent)
regimes of ice-ocean boundary layers (only few meters thick), which
control heat exchanges between warm deep-water masses and the overlying
ice shelves and icebergs. Throughout the presentation I will highlight
knowledge gaps and discuss recent works from our group, including
laboratory experiments and turbulence-resolving phase change
simulations, aiming to improve our understanding and modelling
capabilities of ocean flows around Antarctica.
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The audience is composed of people with rather heterogeneous backgrounds including specialists in solids, fluids, granular flows, statistical physics... so the idea is to keep your talk understandable by people not necessarily working in your field... The seminar time slot runs from 11am to noon so the best is to make the talk last around 45 minutes to leave some time for discussion.
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- Séminaire de Mécanique des Fluides de l’Institut Jean le Rond d’Alembert
- Séminaires du laboratoire MSC, Paris VII
- Séminaires Gulliver
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