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SUMMARY:Changes in tropospheric ozone: anthropogenic emissions\, meteorolo
 gy and long-range transport - Dr Oliver Wild\, Lancaster Environment Centr
 e\, Lancaster University
DTSTART:20091123T141500Z
DTEND:20091123T151500Z
UID:TALK19759@talks.cam.ac.uk
CONTACT:Dr Francis Pope
DESCRIPTION:Long-term observations in different parts of the world indicat
 e that\nthe abundance of ozone in the troposphere is increasing. As ozone 
 is\na strong oxidant and a greenhouse gas\, this has important implication
 s\nfor surface air quality\, for the oxidative environment of the troposph
 ere\,\nand for climate. Reproducing these trends in chemistry-transport mo
 dels has\nproved difficult\, reflecting uncertainties in our understanding
  of emissions\,\nchemical processing and important transport and mixing pr
 ocesses. While\nit is clear that increased anthropogenic emissions of ozon
 e precursors\nare largely responsible for the observed changes in ozone\, 
 current models\ncannot represent the different regional trends in ozone\, 
 suggesting that\nnatural dynamical processes (transport and stratosphere-t
 roposphere\nexchange) and biospheric interactions (biogenic hydrocarbon em
 issions\,\nbiomass burning and land-use change) also have important roles 
 to play.\nWhile a full assessment of the interactions between the atmosphe
 re\,\nbiosphere and climate system awaits the upcoming generation of Earth
 \nSystem models capable of resolving these feedbacks\, this talk describes
 \nrecent studies exploring the strengths and weaknesses in our current\nun
 derstanding of how emissions and meteorological processes control\ntroposp
 heric composition.\n
LOCATION:Unilever Lecture Theatre\, Department of Chemistry
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