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SUMMARY:Subglacial landscapes in Greenland: Obscure(d) insights into past 
 climates\, environments\, and ice sheets - Guy Paxman\, Lamont-Doherty Ear
 th Observatory
DTSTART:20220215T140000Z
DTEND:20220215T150000Z
UID:TALK167459@talks.cam.ac.uk
CONTACT:Dr Alex Bradley
DESCRIPTION:The landscape hidden beneath the Greenland Ice Sheet remains o
 ne of the most sparsely mapped regions on Earth\, but offers a unique reco
 rd of environmental conditions prior to and during widespread glaciation\,
  and of the ice sheet’s response to changing climates. In particular\, t
 he bed topography bears the signatures of past processes of landscape evol
 ution\, which can in turn be used to build an understanding of the geologi
 cal\, glaciological\, and climatological history of Greenland.\nIn this ta
 lk I will present radar\, gravity\, and magnetic data from northern Greenl
 and\, acquired during a decade of Operation IceBridge geophysical surveys 
 over the Greenland Ice Sheet. Radar data are used to map an enclosed subgl
 acial basin and a network of subglacial valleys\, and geomorphological ana
 lysis is used to infer that these features represent a palaeo-lake basin a
 nd palaeo-fluvial channels that formed prior to widespread glaciation. Mod
 elling of gravity and magnetic anomalies indicates that the morphology and
  spatial organisation of these topographic features is influenced by the r
 egional-scale geological structure\, implying a long-lived and well-establ
 ished hydrological system. I will also outline geophysical evidence that i
 ndicates that the palaeo-lake basin contains a sedimentary infill approxim
 ately one kilometre thick. Based on these findings and recent analysis of 
 subglacial material from the nearby Camp Century ice core\, this newly ide
 ntified palaeo-lake basin may contain palaeoclimatically valuable sediment
 ary records of ice sheet extent and environmental conditions in northwest 
 Greenland during (e.g.) interglacial periods of the Pliocene / Pleistocene
 . This region may therefore represent a promising target for future acquis
 ition of ground-based active source seismic data and potential recovery of
  subglacial material by sub-ice drilling programs.
LOCATION:Online (contact organiser for Zoom link)
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