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SUMMARY:Right ozone\, wrong reasons - Mat Evans - University of York
DTSTART:20210301T110000Z
DTEND:20210301T120000Z
UID:TALK157021@talks.cam.ac.uk
CONTACT:76948
DESCRIPTION:Tropospheric ozone is seen as as one of the target molecules f
 or atmospheric chemistry modelling given its direct importance for air pol
 lution and climate change\, but also because we can readily measure its at
 mospheric concentration and its central role in the chemistry of the atmos
 phere. We use a chemistry transport model (GEOS-Chem) run in its regional 
 configuration (0.25x0.3125 degree) over Beijing during the summer-time exp
 lore our ability to simulate O3 during the summer of 2017 taking advantage
  of observations made from the Atmospheric Pollution & Human Health in a C
 hinese Megacity programme. We constrain the emissions of the O3 precursor 
 in the model to the observations and show that this gives a good simulatio
 n of O3 during the campaign\, potentially giving us confidence to use the 
 model to explore policy options to control the concentration of O3 in the 
 city. However\, when we evaluate the model using other observations (HONO\
 , OH\, HO2\, RO2\, OH Reactivity\, Aerosol surface area etc) our faith in 
 the model getting the right O3 for the right reasons drops away. We highli
 ght a number of science questions this comparison raises and suggest that 
 there should be a degree of humility when models are used for evaluating p
 olicy options\, at least in urban environments.
LOCATION:Zoom
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