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SUMMARY:Hydrological networks and flow of the Greenland ice sheet - Poul C
 hristoffersen\, Scott Polar Research Institute\, University of Cambridge
DTSTART:20200309T130000Z
DTEND:20200309T140000Z
UID:TALK138337@talks.cam.ac.uk
CONTACT:Prof. Jerome Neufeld
DESCRIPTION:Glaciers drain ice sheets by transporting ice from the interio
 r to the coast where ice is discharged into the sea as icebergs. In Greenl
 and\, glaciers are flowing faster\, posing a global risk of accelerated se
 a level rise. In this talk I report outcomes from the interdisciplinary RE
 SPONDER project (www.erc-responder.eu)\, which is investigating hydrologic
 al networks and flow of the Greenland ice sheet. Using GPS-assisted drones
  with high accuracy\, the team tracked meltwater pathways and found surfac
 e water to descend rapidly to the bed when supraglacial lakes are intercep
 ted by extensional fractures forming along pre-existing structural weaknes
 ses. We used a hot-water drill to gain access to the bed at specific targe
 ts\, which included the shore of a rapidly draining lake\, and the drained
  lake floor where a hydrological connection supplied a significant\, but v
 arying amount of surface water directly to the basal drainage system. With
  sensors deployed at the bed and within the ice\, we observed the basal co
 nditions that drive fast glacier flow.
LOCATION:MR5\, Centre for Mathematical Sciences
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