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- W2574246221 abstract "ABSTRACT Understanding the drivers of recent change at Greenlandic tidewater glaciers is of great importance if we are to predict how these glaciers will respond to climatic warming. A poorly constrained component of tidewater glacier processes is the near-terminus subglacial hydrology. Here we present a novel method for constraining near-terminus subglacial hydrology with application to marine-terminating Kangiata Nunata Sermia in South-west Greenland. By simulating proglacial plume dynamics using buoyant plume theory and a general circulation model, we assess the critical subglacial discharge, if delivered through a single compact channel, required to generate a plume that reaches the fjord surface. We then compare catchment runoff to a time series of plume visibility acquired from a time-lapse camera. We identify extended periods throughout the 2009 melt season where catchment runoff significantly exceeds the discharge required for a plume to reach the fjord surface, yet we observe no plume. We attribute these observations to spatial spreading of runoff across the grounding line. Persistent distributed drainage near the terminus would lead to more spatially homogeneous submarine melting and may promote more rapid basal sliding during warmer summers, potentially providing a mechanism independent of ocean forcing for increases in atmospheric temperature to drive tidewater glacier acceleration." @default.
- W2574246221 created "2017-01-26" @default.
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- W2574246221 date "2017-01-19" @default.
- W2574246221 modified "2023-10-13" @default.
- W2574246221 title "Spatially distributed runoff at the grounding line of a large Greenlandic tidewater glacier inferred from plume modelling" @default.
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- W2574246221 doi "https://doi.org/10.1017/jog.2016.139" @default.
- W2574246221 hasPublicationYear "2017" @default.
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