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SUMMARY:Global models for atmospheric new particle formation from the CERN
  CLOUD experiment - Hamish Gordon\, University of Leeds
DTSTART:20190513T131500Z
DTEND:20190513T141500Z
UID:TALK123808@talks.cam.ac.uk
CONTACT:Scott Archer-Nicholls
DESCRIPTION:In this seminar I will introduce the CERN CLOUD chamber experi
 ment studying atmospheric new particle formation and the associated gas-ph
 ase chemistry. About half of cloud-forming aerosol particles ('cloud conde
 nsation nuclei') in the atmosphere originate from new particle formation. 
 The formation process\, and the growth of new nanoparticles to the sizes n
 eeded to seed cloud droplets\, can depend on organic chemistry\, often inv
 olving peroxy radicals\, and this has been a particular focus of the CLOUD
  experiment in recent years.  I will discuss work we have done to paramete
 rize new particle formation and growth rates for atmospheric models. I wil
 l discuss the implementation of the parameterizations into the models and 
 the implications of the results from these models for estimated cloud cond
 ensation nuclei concentrations and indirect aerosol radiative forcing. The
  uncertainties in modelling new particle formation remain large\, and I wi
 ll outline how we are moving forward to try to reduce them.
LOCATION:Pfizer Lecture Theatre\, Department of Chemistry
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