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SUMMARY:Supraglacial lake drainage and ice flow acceleration in Greenland 
 - Sam Doyle (University of Aberystwyth)
DTSTART:20141029T163000Z
DTEND:20141029T173000Z
UID:TALK55357@talks.cam.ac.uk
CONTACT:Poul Christoffersen
DESCRIPTION:The rapid in situ drainage of supraglacial lakes drives transi
 ent accelerations in ice flow on the Greenland Ice Sheet and creates the s
 urface-to-bed hydraulic pathways that deliver surface melt water to the ic
 e-bed interface throughout the remainder of the melt season. Records of la
 ke discharge\, ice motion and passive seismicity capture the rapid drainag
 e of a ∼ 4 km2 supraglacial lake through 1.1-km-thick ice in West Greenl
 and.  These observations allow detailed insight into the opening and closu
 re of hydraulically-driven fractures and the transient acceleration in ice
  flow caused by the delivery of large volumes of water to the bed. Further
 more\, the observed expansion of surface melt and supraglacial lakes to hi
 gher elevations in recent warm summers correlates with an acceleration in 
 annually-averaged ice flow in the Greenland ice sheet's interior.  These o
 bservations contrast with the prevailing hypothesis that annually-averaged
  flow in the ablation area is regulated by slower winter flow following wa
 rmer\, faster summers.
LOCATION:Scott Polar Research Institute\, main lecture theatre
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