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SUMMARY:Laboratory Studies of the Formation of Atmospheric Aerosol Under Di
 fferent Chemical Regimes
LOCATION:Chemistry, A101
TZID:America/Denver
DTSTART:20231011T160000
UID:2026-04-23-16-46-49@natsci.colostate.edu
DTSTAMP:20260423T164649
Description:Abstract:\n\nA large fraction of fine particulate matter (aeros
 ol) in the atmosphere is secondary in nature\, formed from the atmospheric
  oxidation of gas-phase compounds. This oxidation chemistry can govern the
  amount and properties of aerosol particles\, and hence their impacts on c
 limate and health. Much of our understanding of aerosol formation derives 
 from laboratory studies\, which to be most useful for atmospheric modeling
  should cover the range of atmospheric oxidation conditions as well as pos
 sible. One particular challenge is matching the chemistry of organic perox
 y (RO2) radicals\; these key intermediates can react via a number of chann
 els – bimolecular reactions with different radical species (NO\, HO2\, R
 O2…) as well as unimolecular (isomerization) reactions – each of which
  may have its own reaction product distribution and aerosol yields. This t
 alk will describe our group’s efforts to measure aerosol formation in an
  environmental (“smog”) chamber\, across the full range of RO2 conditi
 ons found in the atmosphere. For the oxidation of a given aerosol precurso
 r\, we vary RO2 chemistry in the chamber by changing concentrations of var
 ious reactants\, and estimate RO2 fate using chemical ionization mass spec
 trometry (CIMS) of gas-phase products as well as mechanistic modeling of t
 he oxidation chemistry. Chemical systems examined include the oxidation of
  dimethyl sulfide (CH3SCH3\, emitted to the atmosphere by phytoplankton) t
 o form sulfate aerosol\, and the oxidation of isoprene and alpha-pinene (C
 5H8 and C10H16\, emitted by plants) to form organic aerosol.\n\n&nbsp\;\n\
 nAbout the Speaker:\n\nJesse Kroll is a professor at MIT’s Departments o
 f Civil and Environmental Engineering and Chemical Engineering\, and is th
 e Director of MIT’s Ralph M. Parsons Laboratory for Environmental Scienc
 e and Engineering. He received his Ph.D. in Chemistry from Harvard Univers
 ity in 2003\, and was a postdoc at Caltech and then a Research Scientist a
 t Aerodyne Research\, Inc. Jesse’s research group studies atmospheric or
 ganic chemistry\, focusing on laboratory studies of oxidation reactions\, 
 organic aerosol formation and evolution\, and the use of low-cost sensors 
 to measure gas-phase and particulate pollutants. 4:00 pm
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