Preprints
https://doi.org/10.5194/tc-2022-180
https://doi.org/10.5194/tc-2022-180
 
27 Oct 2022
27 Oct 2022
Status: this preprint is currently under review for the journal TC.

Brief communication: The Impact of Interannual Melt Supply Variability on Greenland Ice Sheet Moulin Inputs

Tim Hill1,a and Christine F. Dow1,2 Tim Hill and Christine F. Dow
  • 1Department of Applied Mathematics, University of Waterloo, Waterloo, Canada
  • 2Department of Geography and Environmental Management, University of Waterloo, Waterloo, Canada
  • acurrent address: Department of Earth Sciences, Simon Fraser University, Burnaby, Canada

Abstract. The supraglacial drainage system of the Greenland Ice Sheet, in combination with surface melt rate, controls the rate of water flow into moulins, driving subglacial water pressure. We apply a physically-based surface meltwater flow model to a ∼20 × 27 km2 catchment on the southwestern Greenland Ice Sheet in high and low melt years to examine the impact of surface melt rate and variability on moulin inputs. The model outputs predict important differences in moulin inputs between high and low melt years. These dynamic model outputs will be important in driving future process-scale subglacial hydrology models.

Tim Hill and Christine F. Dow

Status: open (until 22 Dec 2022)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on tc-2022-180', Anonymous Referee #1, 22 Nov 2022 reply
  • RC2: 'Comment on tc-2022-180', Anonymous Referee #2, 28 Nov 2022 reply

Tim Hill and Christine F. Dow

Tim Hill and Christine F. Dow

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Short summary
Water flow across the surface of the Greenland Ice Sheet controls the rate of water flow to the glacier bed. Here, we simulate surface water flow for a small catchment on the southwestern Greenland Ice Sheet. Our simulations predict significant differences in the form of surface water flow in high and low melt years depending on the rate and intensity of surface melt. These model outputs will be important in future work assessing the impact of surface water flow on subglacial water pressure.