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SUMMARY:Inclusion of mountain wave-induced cooling for the formation of po
 lar stratospheric clouds in a chemistry climate model - Andrew Orr (BAS)
DTSTART:20140630T131500Z
DTEND:20140630T143000Z
UID:TALK52920@talks.cam.ac.uk
CONTACT:Dr Amanda Maycock
DESCRIPTION:To improve the representation of the mountain wave-induced PSC
  formation mechanism in the UM-UKCA chemistry-climate model\, the temperat
 ure fluctuations due to unresolved (sub-grid) mountain waves are parameter
 ised.  For case studies of stratospheric mountain waves over the Antarctic
  Peninsula\, it is demonstrated that the stratospheric temperature fluctua
 tions computed by the parameterisation scheme are in excellent agreement w
 ith high-resolution simulations and satellite measurements.  The parameter
 isation was subsequently used to compute the local mountain wave-induced c
 ooling phases in UM-UKCA.  The increased stratospheric cooling was passed 
 to the PSC scheme of the model\, and caused a 30-50% increase in PSC surfa
 ce area density over the Antarctic Peninsula compared to a 30-year control
  simulation.  The parameterisation offers a method for improving lower str
 atospheric temperatures that satisfy PSC thresholds\, the failure of which
  has been suggested as one of the main reasons for the poor simulation of 
 ozone depletion in models.
LOCATION:Unilever Lecture Theatre\, Department of Chemistry
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