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SUMMARY:Impacts of tropical UTLS ozone feedback on surface climate change 
 projections - Dr Peer Nowack\, Cambridge University
DTSTART:20161128T141500Z
DTEND:20161128T151500Z
UID:TALK67843@talks.cam.ac.uk
CONTACT:Paul Griffiths
DESCRIPTION:I will present two central results from my PhD thesis. Using a
 n atmosphere-ocean coupled climate model\, I investigated links between th
 e model representation of the atmospheric trace gas ozone and surface clim
 ate change projections for a standard climate sensitivity experiment. I fo
 und that:\n\n1) circulation-driven ozone changes in the tropical upper tro
 posphere and lower stratosphere (UTLS) can have a highly significant influ
 ence on climate sensitivity estimates.\n\n2) the representation of ozone i
 n the UTLS can also have a major impact on the response of the Walker circ
 ulation and the El Niño Southern Oscillation to carbon dioxide forcing.\n
 \nThese (surprising) results are explained mechanistically\, with an empha
 sis on how future modelling studies could address similar research questio
 ns effectively. Time allowing\, I will further discuss modelling results o
 n how solar and sulphate geoengineering schemes might affect human exposur
 e to ultra-violet radiation and air quality.\n
LOCATION:Pfizer Lecture Theatre\, Department of Chemistry
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