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SUMMARY:Hydrological networks and flow of the Greenland ice sheets - Dr Po
 ul Christoffersen\, Scott Polar Institute (University of Cambridge)
DTSTART:20191107T113000Z
DTEND:20191107T123000Z
UID:TALK132301@talks.cam.ac.uk
CONTACT:Catherine Pearson
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\, focusing on Store Glacier (www.erc-responder.eu). Using 
 GPS-assisted drones with high accuracy\, the team tracked meltwater pathwa
 ys and found surface water to descend rapidly to the bed when supraglacial
  lakes are intercepted by extensional fractures forming along pre-existing
  structural weaknesses. We used a hot-water drill to gain access to the be
 d at specific targets\, which included the shore of a rapidly draining lak
 e\, and the drained lake floor where a hydrological connection supplied a 
 significant\, but varying amount of surface water to the basal drainage sy
 stem\, which modulates the ice sheet flow.
LOCATION:Open Plan Area\, BP Institute\, Madingley Rise CB3 0EZ
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