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SUMMARY:The characteristics of föhn events over the Larsen Ice Shelf\, an
 d their representation in Polar WRF - Jenny Turton\, British Antarctic Sur
 vey
DTSTART:20151023T130000Z
DTEND:20151023T140000Z
UID:TALK62065@talks.cam.ac.uk
CONTACT:Dr. Pranab Deb
DESCRIPTION:The föhn hypothesis describes the link between the Southern A
 nnular Mode (SAM) positive phase\, and the increasing frequency of föhn w
 inds on the leeside of the Antarctic Peninsula. It is theorised that the w
 arm and dry wind conditions prompted surface melting of the Larsen Ice She
 lf (LIS) and subsequently contributed to the destabilisation of large sect
 ions of the ice shelf. This PhD project investigates the spatial distribut
 ion of the föhn events and their impacts over the remainder of the LIS- L
 arsen C\, as part of the NERC funded ‘Orographic Flows and Climate of th
 e Antarctic Peninsula’ (OFCAP) project. \n	Methods have been developed t
 o identify the onset of föhn winds from near-surface observational data a
 nd archived output from the Antarctic Mesoscale Prediction System (AMPS). 
 The AMPS archive holds outputs from the Weather Research and Forecast (WRF
 ) model run operationally over the Antarctic by the National Centre for At
 mospheric Research\, USA. The föhn winds have been identified across the 
 whole of the LIS\, however localised features and patterns are present. Fu
 rthermore\, specific föhn case studies have been run using Polar WRF at 1
 .5km horizontal resolution. Polar WRF is a polar optimised version of WRF.
 \nThe occurrence and characteristics of föhn conditions over the LIS will
  be presented here. Furthermore a comparison of observational and model co
 nditions during the identified föhn conditions will be discussed. A numbe
 r of the specific case studies analysed in greater detail and modelled wit
 h higher resolution Polar WRF will also be presented.  Finally\, the surfa
 ce impacts of the föhn conditions will be highlighted.\n
LOCATION:British Antarctic Survey\, Room 187
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