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Antarctic ice shelf potentially stabilized by exportof meltwater in surface river

Cited 9 time in scopus
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Title
Antarctic ice shelf potentially stabilized by exportof meltwater in surface river
Other Titles
빙붕 상부 활발한 물 배출에 따른 남극 빙붕 안정화
Authors
Robin E. Bell
Lee, Won Sang
Alexandra Boghosian
Massimo Frezzotti
Christopher J. Zappa
Kirsty J. Tinto
Marco Tedesco
Indrani Das
Jonathan Kingslake
Winnie Chu
Subject
Science & Technology - Other Topics
Keywords
Antarctica; Ice shelf stability; Meltwater; Nansen Ice Shelf
Issue Date
2017
Citation
Robin E. Bell, et al. 2017. "Antarctic ice shelf potentially stabilized by exportof meltwater in surface river". NATURE, 544(1): 344-348.
Abstract
Meltwater stored in ponds1 and crevasses can weaken and fracture ice shelves, triggering their rapid disintegration2. This ice-shelf collapse results in an increased flux of ice from adjacent glaciers3 and ice streams, thereby raising sea level globally4. However, surface rivers forming on ice shelves could potentially export stored meltwater and prevent its destructive effects. Here we present evidence for persistent active drainage networks―interconnected streams, ponds and rivers―on the Nansen Ice Shelf in Antarctica. That export a large fraction of the ice shelf’s meltwater into the ocean. We find that active drainage has exported water off the ice surface through waterfalls and dolines for more than a century. The surface river terminates in a 130-metre-wide waterfall that can export the entire annual surface melt over the course of seven days. During warmer melt seasons, these drainage networks adapt to changing environmental conditions by remaining active for longer and exporting more water. Similar networks are present on the ice shelf in front of Petermann Glacier, Greenland, but other systems, such as on the Larsen C and Amery Ice Shelves, retain surface water at present. The underlying reasons for export versus retention remain unclear. Nonetheless our results suggest that, in a future warming climate, surface rivers could export melt off the large ice shelves surrounding Antarctica―contrary to present Antarctic ice-sheet models1, which assume that meltwater is stored on the ice surface where it triggers ice-shelf disintegration. Ponded meltwater on the Larsen B Ice Shelf
URI
http://repository.kopri.re.kr/handle/201206/6007
DOI
http://dx.doi.org/10.1038/nature22048
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