TY - JOUR
T1 - Sensitive response of the Greenland Ice Sheet to surface melt drainage over a soft bed
AU - Bougamont, M.
AU - Christoffersen, Poul
AU - Hubbard, Alun
AU - Fitzpatrick, Andrew Alexander William
AU - Doyle, Samuel Huckerby
AU - Carter, Sasha P.
N1 - Bougamont, M., Christoffersen, P., Hubbard, A., Fitzpatrick, A. A. W., Doyle, S. H., Carter, S. P. (2014). Sensitive response of the Greenland Ice Sheet to surface melt drainage over a soft bed. Nature Communications, 5, [5052]
PY - 2014/9/29
Y1 - 2014/9/29
N2 - The dynamic response of the Greenland Ice Sheet (GrIS) depends on feedbacks between surface meltwater delivery to the subglacial environment and ice flow. Recent work has highlighted an important role of hydrological processes in regulating the ice flow, but models have so far overlooked the mechanical effect of soft basal sediment. Here we use a three-dimensional model to investigate hydrological controls on a GrIS soft-bedded region. Our results demonstrate that weakening and strengthening of subglacial sediment, associated with the seasonal delivery of surface meltwater to the bed, modulates ice flow consistent with observations. We propose that sedimentary control on ice flow is a viable alternative to existing models of evolving hydrological systems, and find a strong link between the annual flow stability, and the frequency of high meltwater discharge events. Consequently, the observed GrIS resilience to enhanced melt could be compromised if runoff variability increases further with future climate warming.
AB - The dynamic response of the Greenland Ice Sheet (GrIS) depends on feedbacks between surface meltwater delivery to the subglacial environment and ice flow. Recent work has highlighted an important role of hydrological processes in regulating the ice flow, but models have so far overlooked the mechanical effect of soft basal sediment. Here we use a three-dimensional model to investigate hydrological controls on a GrIS soft-bedded region. Our results demonstrate that weakening and strengthening of subglacial sediment, associated with the seasonal delivery of surface meltwater to the bed, modulates ice flow consistent with observations. We propose that sedimentary control on ice flow is a viable alternative to existing models of evolving hydrological systems, and find a strong link between the annual flow stability, and the frequency of high meltwater discharge events. Consequently, the observed GrIS resilience to enhanced melt could be compromised if runoff variability increases further with future climate warming.
UR - http://hdl.handle.net/2160/27721
U2 - 10.1038/ncomms6052
DO - 10.1038/ncomms6052
M3 - Article
C2 - 25262753
SN - 2041-1723
VL - 5
JO - Nature Communications
JF - Nature Communications
M1 - 5052
ER -
