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SUMMARY:Erebus volcano\, Antarctica: eruption dynamics and atmospheric imp
 acts - Clive Oppenheimer\, Department of Geography\, University of Cambrid
 ge
DTSTART:20090218T163000Z
DTEND:20090218T173000Z
UID:TALK17096@talks.cam.ac.uk
CONTACT:Poul Christoffersen
DESCRIPTION:Erebus is an exceptional volcano. It rises nearly 4 km above s
 ea-level\, dominating Ross Island\, and continuously erupts an unusual mag
 ma (phonolite) via a persistent lava lake in the summit crater. But it als
 o goes through phases\, lasting months\, in which this peaceful behaviour 
 is punctuated by violent explosive eruptions that occur a few times a day.
  Erebus also represents the largest point source of several reactive gases
  and particles to the Antarctic troposphere. The volcano is monitored more
  or less year-round by a network of seismometers and other instruments\, a
 nd is subject to intense field campaigns each year during the austral summ
 er. Drawing on the results of measurements of gas and heat emissions from 
 the volcano\, I will review progress in the development of conceptual mode
 ls for the evolution\, transport and degassing of magma beneath Erebus\, d
 iscuss the origins of the explosive activity\, and examine the evidence fo
 r impacts of the emissions of NOx\, halogens and sulfur on the atmospheric
  environment.
LOCATION:Scott Polar Research Institute\, main lecture theatre
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