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PRODID:-//Memento EPFL//
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SUMMARY:Aerosol production and transformation: from sources to impacts
DTSTART:20110722T101500
DTSTAMP:20260924T085416Z
UID:953db6dc869d080e460e6e188921e1d26bb675f781f323f2cbd6bdd0
CATEGORIES:Conferences - Seminars
DESCRIPTION:Julie Cozic\nThe atmosphere is known to consist of a gas mixtu
 re but it is also composed of a large quantity of micron-size and smaller 
 particles in suspension. These are called aerosol particles. They originat
 e from a wide variety of sources. They can be natural (sea salt  dust  vol
 canic ashes…) or anthropogenic (fossil fuel powered engines  industry  b
 iomass burning  etc.). They can be emitted by primary processes or can be 
 formed secondary by the photochemical processing of gaseous precursors of 
 either natural or anthropogenic origin into condensable material. They are
  composed of a wide variety of chemical compounds  inorganic (e.g. SO42-  
 NH4+  Cl-  Mg2+  Fe  Al) and organic (e.g. PAHs  organic acids  alkanes). 
 Atmospheric aerosols have an important role in human health problems. They
  also play a major role in climate change by absorbing and scattering sola
 r and infrared radiation  referred to as the direct forcing. They can also
  indirectly influence climate by altering the microphysical properties of 
 clouds. The quantitative impacts nevertheless are still highly uncertain.\
 n\nStudying the chemical composition of aerosol particles is of major inte
 rest to provide information on the sources and processes that influence th
 eir behavior. Results obtained are essential in decision makings of air qu
 ality control strategies as well as on the understanding of the climate sy
 stem. For instance  the research program Particul’air (LGGE  FR  http://
 particulair.free.fr/) was conducted to study the chemical composition and 
 specific tracers in nine rural sites in France  and allow identifying the 
 strong influence of biomass burning particularly in Alpine valleys. Anothe
 r example that can illustrate the importance of studying aerosol  is the r
 esearch program CLACE (PSI  CH  http://aerosolforschung.web.psi.ch/Clace3_
 Page/Clace3_Page.htm) that have been conducted to study the formation of w
 ater droplets and thus the formation of clouds  which have a strong impact
  on radiation climate budget. This presentation will show details of those
  studies to demonstrate how important it is to understand the evolution of
  aerosol particles from the time of emission through transport and transfo
 rmations in order to assess the impacts they can have.
LOCATION:CM 1 1 https://plan.epfl.ch/?room==CM%201%201
STATUS:CONFIRMED
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