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SUMMARY:The upper troposphere/lower stratosphere and its role in chemistry
 -climate coupling - Dr Michaela Hegglin\, University of Reading
DTSTART:20121112T141500Z
DTEND:20121112T153000Z
UID:TALK40518@talks.cam.ac.uk
CONTACT:Dr Alex Archibald
DESCRIPTION:The upper troposphere/lower stratosphere (UTLS) is believed to
  exhibit a very high potential for significant chemistry-climate feedbacks
 . In this talk I will review the UTLS characteristics that make this regio
 n important for chemistry-climate coupling and summarize what is known abo
 ut potential feedback mechanisms. The most prominent UTLS characteristics 
 have been discovered in studies using aircraft\, balloon\, and satellite m
 easurements\, which were challenging due to prevailing local conditions su
 ch as low temperatures and pressures but also high dynamical variability a
 nd occurrence of clouds. Using the example of the Earth-Explorer 7 mission
  candidate PREMIER\, I will illustrate that further advances in our knowle
 dge can still be expected. The investigation of feedback mechanisms on the
  other hand heavily relies on the use of chemistry-climate models\, which 
 in recent years have greatly increased our knowledge of the role of the UT
 LS in chemistry-climate coupling. Examples shown will include the impact o
 f a changing climate on the distributions of radiatively active gases and 
 its consequences for the troposphere.\n\n
LOCATION:Unilever Lecture Theatre\, Department of Chemistry
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