Direct observations of submarine melt and subsurface geometry at a tidewater glacier
Sutherland, D.A.; Jackson, R.H.; Kienholz, C.; Amundson, J.M.; Dryer, W.P.; Duncan, D.; Eidam, E.F.; Motyka, R.J.; Nash, J.D. (2019). Direct observations of submarine melt and subsurface geometry at a tidewater glacier. Science (Wash.) 365(6451): 369-374. https://dx.doi.org/10.1126/science.aax3528
In: Science (Washington). American Association for the Advancement of Science: New York, N.Y. ISSN 0036-8075; e-ISSN 1095-9203, more
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| Authors | | Top |
- Sutherland, D.A.
- Jackson, R.H.
- Kienholz, C.
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- Amundson, J.M.
- Dryer, W.P.
- Duncan, D.
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- Eidam, E.F.
- Motyka, R.J.
- Nash, J.D.
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| Abstract |
Ice loss from the world’s glaciers and ice sheets contributes to sea level rise, influences ocean circulation, and affects ecosystem productivity. Ongoing changes in glaciers and ice sheets are driven by submarine melting and iceberg calving from tidewater glacier margins. However, predictions of glacier change largely rest on unconstrained theory for submarine melting. Here, we use repeat multibeam sonar surveys to image a subsurface tidewater glacier face and document a time-variable, three-dimensional geometry linked to melting and calving patterns. Submarine melt rates are high across the entire ice face over both seasons surveyed and increase from spring to summer.The observed melt rates are up to two orders ofmagnitude greater than predicted by theory, challenging current simulations of ice loss from tidewater glaciers. |
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