Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 42, Issue 20, Pages 8471-8480Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2015GL065782
Keywords
ice flow modeling; basal processes; subglacial hydrology; West Antarctic ice sheet; mass balance; thermodynamics
Categories
Funding
- Isaac Newton trust
- Cecil H., and Ida M. Green Foundation
- Natural Environment Research Council [NE/E005950/1, NE/J005800/1]
- U.S. Department of Energy Office of Science, Biological and Environmental Research program
- National Science Foundation [0338295, ANT-0838885 (Fricker)]
- Cryospheric Sciences program of NASA
- Natural Environment Research Council [NE/J005754/1, NE/J005800/1, NE/E005950/1] Funding Source: researchfish
- NERC [NE/J005800/1, NE/E005950/1, NE/J005754/1] Funding Source: UKRI
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Ongoing, centennial-scale flow variability within the Ross ice streams of West Antarctica suggests that the present-day positive mass balance in this region may reverse in the future. Here we use a three-dimensional ice sheet model to simulate ice flow in this region over 250years. The flow responds to changing basal properties, as a subglacial till layer interacts with water transported in an active subglacial hydrological system. We show that a persistent weak bed beneath the tributaries of the dormant Kamb Ice Stream is a source of internal ice flow instability, which reorganizes all ice streams in this region, leading to a reduced (positive) mass balance within decades and a net loss of ice within two centuries. This hitherto unaccounted for flow variability could raise sea level by 5mm this century. Better constraints on future sea level change from this region will require improved estimates of geothermal heat flux and subglacial water transport.
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