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SUMMARY:The South Georgia Gravity Wave Experiment (SG-WEX): investigating 
 the small island problem - Tracy Moffat-Griffin\, British Antarctic Survey
DTSTART:20151111T140000Z
DTEND:20151111T150000Z
UID:TALK62348@talks.cam.ac.uk
CONTACT:Dr. Pranab Deb
DESCRIPTION:Gravity waves are an important type of atmospheric wave. They 
 play a key role in many atmospheric processes\, ranging from convection to
  the mixing of chemical species to influencing the global-scale circulatio
 n of the stratosphere and mesosphere. Because of this\, it is essential to
  represent their effects in numerical weather prediction and climate model
 s.\n\nGravity waves are generated by sources including winds blowing over 
 mountains\, jet-stream instabilities and strong convection. The waves can 
 transport energy and momentum away from these sources and deposit them at 
 greater heights\, thus exerting a significant "drag" on the circulation an
 d so coupling together different layers of the atmosphere. \n\nRecent stud
 ies have shown that isolated mountainous islands in regions of strong wind
 s can be intense sources of gravity waves that can have climatologically-s
 ignificant effects on atmospheric circulation. However\, most climate and 
 numerical weather prediction models cannot accurately model waves from suc
 h small\, intense island sources because the islands are too small compare
 d to the resolution of the models - this is the "small island problem". \n
 \nThe South Georgia Gravity Wave Experiment (SG-WEX) is a NERC funded obse
 rvational and modelling experiment to determine the nature and impacts of 
 gravity waves generated by South Georgia (a small\, mountainous island in 
 the Southern Ocean).  It is a collaboration between Bath University\, BAS\
 , Leeds University and the Met Office.\n\nEarlier this year two month-long
  radiosonde campaigns were conducted from South Georgia to examine the gra
 vity wave field in the troposphere and lower stratosphere.  The results fr
 om these two campaigns are presented in this talk alongside preliminary sa
 tellite and model results.\n
LOCATION:British Antarctic Survey\, Room 307
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