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UID:20250812T161208EDT-1744v3zIRe@132.216.98.100
DTSTAMP:20250812T201208Z
DESCRIPTION:Please join us as we welcome Dr. Ulrich Krieger\, a Senior Scie
 ntist from the Institute for Atmospheric and Climate Science in the  Depar
 tment of Environmental Systems Science at ETH Zurich\, for a seminar title
 d 'Effect of particle morphology on the absorption cross section of aeroso
 l particles containing brown or black carbon'. Coffee will be served.\nAbs
 tract\n\nWhile it is well known that absorption by light absorbing carbon 
 increases when the carbon is internally mixed with other material (e.g. Bo
 nd et al. 2013)\, the magnitude of this enhancement is still under debate 
 (Cappa et al.\, 2013). Attributing the large variability of measured absor
 ption enhancement relies on an appropriate representation of carbon morpho
 logy and mixing with other materials (Scarnato et al.\, 2013).\nHere we in
 vestigate in particular how liquid-liquid phase separation (LLPS) influenc
 es the absorption cross section of particles containing absorbing\, molecu
 lar carbon (“brown carbon”) as well as black carbon aggregates.\nI will fi
 rst discuss the molecular absorber case. I will show experimental evidence
  that a core shell morphology is the most prevalent morphology for phase s
 eparated atmospheric aerosol and that the molecular absorbers are in the o
 rganic phase after LLPS. I will compare calculated absorption efficiencies
  for homogeneous particles and phase separated particles for different sce
 narios\, i.e. different volume mixing ratios and concentrations of the mol
 ecular absorber.\nRecently\, we showed that also black carbon (BC) prefere
 ntially segregates into the organic phase upon LLPS in micron size particl
 es (Brunamonti et al. 2015)\, resulting in an “inverted core-shell structu
 re”\, in which a transparent aqueous core is surrounded by a BC-containing
  absorbing shell. In the Brunamonti et al. study\, the radiative effect fo
 r accumulation size particles was estimated assuming the BC-absorption to 
 be volume mixed within the shell. I will compare this with a more realisti
 c treatment of the black carbon as fractal aggregate and also study config
 urations in which the black carbon is only partially embedded in the organ
 ic liquid phase.\n
DTSTART:20161017T193000Z
DTEND:20161017T203000Z
LOCATION:Room 934\, Burnside Hall\, CA\, QC\, Montreal\, H3A 0B9\, 805 rue 
 Sherbrooke Ouest
SUMMARY:Seminar: Dr. Ulrich Krieger
URL:/meteo/channels/event/seminar-dr-ulrich-krieger-26
 2572
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