Results 31 to 40 of about 546 (164)

Intercomparison of surface meltwater routing models for the Greenland ice sheet and influence on subglacial effective pressures [PDF]

The Cryosphere, 2020
Each summer, large volumes of surface meltwater drain off the Greenland ice sheet (GrIS) surface through moulins to the bed, impacting subglacial hydrology and ice flow dynamics.
K. Yang, K. Yang, A. Sommers, L. C. Andrews, L. C. Smith, L. C. Smith, X. Lu, X. Lu, X. Fettweis, M. Li, M. Li   +10 more
doaj   +1 more source

Tidal Grounding‐Line Migration Modulated by Subglacial Hydrology [PDF]

Geophysical Research Letters, 2020
AbstractWe present a mathematical model of the hydrology of grounding‐line migration on tidal timescales, in which the ice acts elastically, overlying a connected hydrological network, with the ocean tides modeled by an oscillating far‐field fluid height. The upstream grounding‐line migration is driven by a fluid pressure gradient through the grounding
Warburton, KLP, Hewitt, DR, Neufeld, JA
openaire   +3 more sources

Near-margin ice thickness and subglacial water routing, Leverett Glacier, Greenland

Arctic, Antarctic, and Alpine Research, 2018
Ice thickness measurements near the margin of the Greenland Ice Sheet (GrIS) are relatively sparse, presenting issues for modeling ice-flow dynamics, ice-sheet change, and subglacial hydrology.
Neil Ross, Andrew J. Sole, Stephen J. Livingstone, Ádam Igneczi, Mathieu Morlighem   +4 more
doaj   +1 more source

Two-way coupling between ice flow and channelized subglacial drainage enhances modeled marine-ice-sheet retreat [PDF]

The Cryosphere
Ice-sheet models used to predict sea-level rise often neglect subglacial hydrology. However, theory and observations suggest that ice flow and subglacial water flow are bidirectionally coupled: ice geometry affects hydraulic potential, hydraulic ...
G. Lu, J. Kingslake
doaj   +1 more source

Modeling Antarctic subglacial lake filling and drainage cycles [PDF]

The Cryosphere, 2016
The growth and drainage of active subglacial lakes in Antarctica has previously been inferred from analysis of ice surface altimetry data. We use a subglacial hydrology model applied to a synthetic Antarctic ice stream to examine internal controls on the
C. F. Dow, M. A. Werder, S. Nowicki, R. T. Walker   +3 more
doaj   +1 more source

Subglacial hydrology modeling predicts high winter water pressure and spatially variable transmissivity at Helheim Glacier, Greenland

Journal of Glaciology, 2023
Water pressure beneath glaciers influences ice velocity. Subglacial hydrology models are helpful for gaining insight into basal conditions, but models depend on unconstrained parameters, and a current challenge is reproducing elevated water pressures in ...
Aleah Sommers, Colin Meyer, Mathieu Morlighem, Harihar Rajaram, Kristin Poinar, Winnie Chu, Jessica Mejia   +6 more
doaj   +1 more source

Observed and modeled moulin heads in the Pâkitsoq region of Greenland suggest subglacial channel network effects [PDF]

The Cryosphere, 2023
In the ablation zone of land-terminating areas of the Greenland Ice Sheet, water pressures at the bed control seasonal and daily ice motion variability.
C. Trunz, C. Trunz, K. Poinar, L. C. Andrews, M. D. Covington, J. Mejia, J. Mejia, J. Gulley, V. Siegel   +8 more
doaj   +1 more source

SUHMO: an AMR SUbglacial Hydrology MOdel v1.0

, 2022
Abstract. Water flowing under ice sheets and glaciers can have a strong influence on ice dynamics, particularly through pressure changes, suggesting that a comprehensive ice sheet model should include the effect of basal hydrology. Modeling subglacial hydrology remains a challenge however, mainly due to the range of spatial and temporal scales involved -
Anne M. Felden, Daniel F. Martin, Esmond G. Ng   +2 more
openaire   +1 more source

Drainage and refill of an Antarctic Peninsula subglacial lake reveal an active subglacial hydrological network

The Cryosphere, 2022
Abstract. The presence of subglacial lakes and subglacial hydrological networks under the East and West Antarctic ice sheets is now relatively well understood, whilst their influence on ice dynamics is the subject of ongoing research. In contrast, little is known about subglacial lakes and hydrological networks under the Antarctic Peninsula Ice Sheet ...
Hodgson, Dominic A., Jordan, Tom A., Ross, Neil, Riley, Teal R., Fretwell, Peter   +4 more
openaire   +5 more sources

The Importance of Solving Subglaciar Hydrology in Modeling Glacier Retreat: A Case Study of Hansbreen, Svalbard

Hydrology
Arctic tidewater glaciers are retreating, serving as key indicators of global warming. This study aims to assess how subglacial hydrology affects glacier front retreat by comparing two glacier–fjord models of the Hansbreen glacier: one incorporating a ...
Eva De Andrés, José M. Muñoz-Hermosilla, Kaian Shahateet, Jaime Otero   +3 more
doaj   +1 more source