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SUMMARY:Climate of 79N glacier (Greenland) - Jenny Turton\, Friedrich-Alex
 ander Universität
DTSTART:20180612T090000Z
DTEND:20180612T100000Z
UID:TALK102745@talks.cam.ac.uk
CONTACT:Dr Gillian Young
DESCRIPTION:Nioghalfjerdsforden (also known as 79°N glacier after its loc
 ation) is a tidal-outlet glacier with an 80km long floating tongue\, in th
 e northeast of Greenland. In recent years\, the floating ice tongue has in
 creased in velocity and a number of calving events have displayed the pote
 ntial sensitivity of the glacier to changing conditions. Approximately 8% 
 of the Greenland ice sheet drains into 79N\, prompting belief that any ins
 tabilities may propagate upstream\, and into the interior of the ice sheet
 . Melt ponds are a persistent feature on the surface of the glacier\, and 
 periodically drain to the base. Despite this\, relatively little is known 
 about the past or current meteorological conditions near the surface of 79
 °N. Without adequate knowledge of the climatology\, the response of the g
 lacier to future changes cannot be accurately assessed.\n\nHere\, I presen
 t analysis of the only meteorological observations taken on the floating t
 ongue of the glacier.  Sudden warming events\, on the order of 10-40°C in
  48 hours\, are regularly observed. Using a 3-domain high-resolution setup
  of the Weather Research and Forecasting (WRF) model\, I investigate the m
 echanisms responsible for an event with the largest magnitude of change. \
 n\nFurthermore\, details of the climatology of the region will be presente
 d. From analysis of ERA-Interim reanalysis data\, the annual air temperatu
 re over the last 35 years has increased by ~3°C.  The inter-annual variab
 ility is largest in winter due to the increased variability of MSLP in the
  north Atlantic\, and the high frequency of the sudden warming events. The
  combination of both leads to ‘coreless winters’ or the absence of a t
 ypical sinusoidal temperature signal. The impact of the both the short-ter
 m sudden warming events and the coreless winters on the surface mass balan
 ce of the glacier will be investigated in future work. 
LOCATION:British Antarctic Survey\, Seminar Room 187
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