Melting is pervasive along the ice surrounding Antarctica. On the surface of the grounded ice sheet and floating ice shelves, extensive networks of lakes, streams and rivers both store and transport water. As melting increases with a warming climate, the surface hydrology of Antarctica in some regions could resemble Greenland’s present-day ablation and percolation zones. Drawing on observations of widespread surface water in Antarctica and decades of study in Greenland, we consider three modes by which meltwater could impact Antarctic mass balance: increased runoff, meltwater injection to the bed and meltwater-induced ice-shelf fracture — all of which may contribute to future ice-sheet mass loss from Antarctica.
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A.F.B. acknowledges support from a Leverhulme/Newton Trust Early Career Fellowship (grant no. ECF-2014-412). We thank X. Fettweis for producing and making Greenland MAR model output available and M. Tedesco for discussion on their usage. The authors thank O. Sergienko for useful discussions. The authors acknowledge the participants in the February 2018 NSF-funded workshop on Antarctic Surface Hydrology and Future Ice Shelf Stability (grant no. 1743326) for their lively, thoughtful discussion. L.D.T. acknowledges support from NSF Antarctic Glaciology Program award no. 1643733.
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Nature Communications (2019)