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SUMMARY:Ice Stream Tides - Hilmar Gudmundsson (British Antarctic Survey)
DTSTART:20101101T163000Z
DTEND:20101101T173000Z
UID:TALK26818@talks.cam.ac.uk
CONTACT:Poul Christoffersen
DESCRIPTION:The ice streams of Antarctica are fast flowing glaciers that m
 ove large amount of ice from the interior of the ice sheet towards the oce
 an. Despite being grounded\, and therefore not directly subjected to ocean
 ic tides\, ice-stream flow is sometimes tidally modulated. These ice-strea
 m tides are caused by oceanic tides\, but the relationship between oceanic
  and ice-streams tides can be complex. As an example\, on Rutford Ice Stre
 am (RIS)\, one of the large ice streams of West Antarctica\,  ice flow spe
 eds increase by 10 % in the course of about one week\, and then decreases 
 again in the following week. Despite being subjected to strong diurnal tid
 es\, there is little or no diurnal modulation in the flow of RIS.   Respon
 se of ice streams to tides is critically affected by the mechanical condit
 ions at the base of the ice stream. Observations and modelling of ice-stre
 am tides can therefore be used establish constrains on basal processes and
  to test theoretical concepts about the flow of large ice masses. 
LOCATION:Scott Polar Research Institute\, main lecture theatre
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