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• W2337266923 endingPage "938" @default.
• W2337266923 startingPage "925" @default.
• W2337266923 abstract "Investigations of the Greenland ice sheet's subglacial hydrological system show that the connectivity of different regions of the system influences how the glacier velocity responds to variations in surface melting. Here we examine whether subglacial water flow paths can be rerouted beneath three outlet glaciers in the ablation zone of western Greenland. We use Lamont-Doherty and Center for Remote Sensing of Ice Sheets of University of Kansas (CReSIS) ice-penetrating radar data to create a new ice thickness map. We then use a simple subglacial water flow model to examine whether flow paths can be rerouted and identify the topographic conditions that are sensitive to subglacial rerouting. By varying water pressures within an observationally constrained range, we show that moderate changes in pressure can cause flow paths to reroute and exchange water from one subglacial catchment to another. Flow across subglacial overdeepenings is particularly sensitive to rerouting. These areas have low hydraulic gradients driving flow, so subtle water pressure variations have a strong influence on water flow direction. Based on correlations between water flow paths and ice velocity changes, we infer that water piracy between neighboring catchments can result in a different spatial pattern of hydrologically induced ice velocity speedup depending on the amount and timing of surface melt. The potential for subglacial water to reroute across different catchments suggests that multiple hydrographs from neighboring glaciers are likely necessary to accurately ascertain melt budgets from proglacial point measurements. The relationship between surface runoff, ice dynamics, and proglacial discharge can be altered by rerouting of subglacial water flow within and across outlet glaciers." @default.
• W2337266923 created "2016-06-24" @default.
• W2337266923 creator A5008636658 @default.
• W2337266923 creator A5060538862 @default.
• W2337266923 creator A5075212195 @default.
• W2337266923 date "2016-05-01" @default.
• W2337266923 modified "2023-10-11" @default.
• W2337266923 title "Rerouting of subglacial water flow between neighboring glaciers in West Greenland" @default.
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• W2337266923 doi "https://doi.org/10.1002/2015jf003705" @default.
• W2337266923 hasPublicationYear "2016" @default.
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