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SUMMARY:Closing the Gap on Missing Sources of Organic Aerosol in the Atmos
 phere
DTSTART:20110721T111500
DTSTAMP:20260506T144104Z
UID:f1965c8d3b2051a99a867e9fb69c71065c24e68a4b8ad20a91c20d7b
CATEGORIES:Conferences - Seminars
DESCRIPTION:Christopher Hennigan\nAerosols  or particulate matter  are ubi
 quitous components of the atmosphere that exert important impacts on human
  health and global climate  though our understanding of these effects is f
 ar from clear.  A better characterization of aerosol physical and chemical
  properties  including their sources and fate  is vital in obtaining a mor
 e accurate assessment of their contribution to climate change and in devis
 ing mitigation strategies with public health in mind.  Extensive ambient m
 easurements have demonstrated that organic compounds comprise a significan
 t fraction of aerosol mass in many locations globally.  Our knowledge of t
 his organic aerosol (OA)  however  is incomplete  as evidenced by the syst
 ematic underprediction of OA concentrations by state-of-the-art computer m
 odels.  Recent research efforts have intensified to identify this “missi
 ng” source of OA  with many hypotheses emerging.  Measurements conducted
  in Atlanta  Georgia point to liquid water associated with aerosols as an 
 important OA source that has not been considered previously.  This mechani
 sm involves the dissolution and subsequent reaction of soluble organic gas
 es in the aerosol aqueous phase.  It is likely different from processes oc
 curring in cloud and fog water due to extreme concentration differences.  
 Previous studies have ignored this possibility due to the relatively small
  amount of water associated with fine particles\; however  our results pro
 vide strong evidence that this pathway contributes significantly to ambien
 t OA concentrations.  This mechanism is likely to be important in other lo
 cations  as well  and may represent the dominant source of OA missing from
  current models.
LOCATION:CM 1 1 https://plan.epfl.ch/?room==CM%201%201
STATUS:CONFIRMED
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