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SUMMARY:Progress towards understanding the glacier debris cover anomaly in
  High Mountain Asia - Dr Evan Miles\, Swiss Federal Institute for Forest\,
  Snow and Landscape Research WSL
DTSTART:20221014T151500Z
DTEND:20221014T160000Z
UID:TALK208108@talks.cam.ac.uk
CONTACT:Geography/SPRI Webmaster
DESCRIPTION:Rocky debris covers 30% of glacier ablation areas in High Moun
 tain Asia and generally suppresses melt. However\, remote sensing observat
 ions have shown no statistical difference in glacier thinning rates betwee
 n areas with and without debris cover\; the ‘debris cover anomaly’. Th
 is pattern is apparent at subregional and regional scales\, even after con
 trolling for the elevation differences between debris-covered and clean ic
 e. \n\nTwo primary hypotheses to explain this behaviour have interpreted 
 the thinning patterns in terms of melt or ice supply differences. First\, 
 rapid melt at supraglacial ponds and ice cliffs could enhance ablation in 
 debris-covered areas\, and therefore thinning as well. These features cann
 ot entirely compensate for the melt reduction under debris\, so a second h
 ypothesis interprets the anomaly to indicate differences in emergence velo
 city between debris-covered and clean ice. However\, complete understandin
 g of the problem is challenged by a scale gap: the prior process studies h
 ave focused on single glaciers\, whereas the anomaly has been identified f
 or subregional- to regional spatial scales. Furthermore\, these hypotheses
  neglect numerous other differences between debris-covered and clean glaci
 ers (e.g. topo-climatic situation\, accumulation mechanisms)\, which could
  bias this comparison.\n\nWe overcome these limitations and investigate wh
 ich\, if any hypothesis\, explains the observed behaviour through a direct
  assessment leveraging diverse large datasets and modelling.
LOCATION:Lecture Theatre\, Scott Polar Research Institute
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