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SUMMARY:Stratospheric dynamics in a geoengineered world - Angus Ferraro (U
 niversity of Reading)
DTSTART:20131121T141500Z
DTEND:20131121T151500Z
UID:TALK47168@talks.cam.ac.uk
CONTACT:Dr Amanda Maycock
DESCRIPTION:Geoengineering by injection of aerosol into the stratosphere h
 as been proposed as a countermeasure to anthropogenic global warming. Alth
 ough global cooling should result\, a geoengineered climate will not be th
 e same as the preindustrial climate. In this presentation I will focus on 
 the impacts of stratospheric aerosol geoengineering on the dynamics of the
  stratosphere. Geoengineering aerosols produce tropical radiative heating\
 , which increases the stratospheric pole-Equator temperature gradient in t
 he lower stratosphere\, intensifying the stratospheric polar vortex. Simil
 ar intensifications are seen following volcanic eruptions. However\, using
  geoengineering to counterbalance a substantial greenhouse gas radiative f
 orcing has a larger and more persistent effect on the stratosphere than a 
 transient volcanic aerosol layer. Here\, I describe the effect of geoengin
 eering on the frequency and dynamics of stratospheric sudden warming event
 s. There are also related changes in the latitude of the tropospheric jets
  which act to amplify\, not minimise\, the response to greenhouse warming.
  I will also discuss the effect of geoengineering on the Brewer-Dobson cir
 culation and the potential for formation of polar stratospheric clouds.
LOCATION:Unilever Lecture Theatre\, Department of Chemistry
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