Postdoctoral Fellow in Physical Oceanography, University of Tasmania.
ice sheet can be hard to comprehend. Two kilometres thick on average and covering nearly twice the area of Australia, the ice sheet holds enough freshwater to raise global sea levels by 58 metres.from this sheet is projected to be the leading driver of sea level rise by 2100, yet its contribution remains highly uncertain.
The boundary layer between the ice shelf and the ocean is cold, miles from anywhere, and beneath very thick ice, so it’s no wonder it has hardly been measured at all. But only recently have simulations of the ice-ocean boundary layer become feasible, as computing resources grow and the cost of using them shrinks.
For steeply sloping ice, the insulating effect is much less. The energetic flow of meltwater as it rises under steep ice leads to mixing with the warmer ocean waters. This increases melting.Using sonar and cameras, these robots have revealed a weird and wonderful"icescape" on the underside of ice shelves.
For instance, in the warm, calm eastern part of the Dotson ice shelf in west Antarctica, an autonomous robot observed basal terraces. In the west of Dotson — which experiences cold, fast currents — large mussel-shaped scoops were discovered.that allow the ice-water boundary to move in time show the"self-sculpting" behaviour of ice melt. This is similar to how dunes form and move in a desert.
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