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SUMMARY:Multiphase Dimethyl Sulfide Reactions Away from H2SO4(g): Modeling 
 the Depth of Methanesulfinate + O3 in Atmospheric Microdroplets
LOCATION:Chemistry A101
TZID:America/Denver
DTSTART:20251105T160000
UID:2026-05-06-18-51-58@natsci.colostate.edu
DTSTAMP:20260506T185158
Description:About the seminar:\n\nAtmospheric gaseous sulfuric acid\, an im
 portant aerosol precursor\, and other S(VI) compounds affect cloud radiati
 ve properties and thus Earth’s climate. Dimethyl sulfide (DMS) produced 
 by marine microbes\, especially in sea ice habitats\, is the largest bioge
 nic source of atmospheric sulfur and oxidizes through gas-phase reactions 
 to H2SO4(g) or multiphase reactions to other S(VI) compounds that grow pre
 existing atmospheric particles. Methanesulfinic acid (CH3SOOH\; MSIA) is a
  key intermediate in DMS oxidation at low temperatures. However\, large-sc
 ale models disagree on whether reaction with OH(g)\, OH(aq)\, or O3(aq) is
  the main chemical sink of MSIA. Moreover\, these results are based on ins
 ufficient measurements of k_(MSIA/MSI-(aq) + O3(aq)) across atmosphericall
 y relevant conditions. The most recent kinetics measurements observed the 
 rate of reaction in microdroplets\, in which kinetics depend on interfacia
 l transport timescales and surface reactions whereas well-mixed\, beaker-s
 cale kinetics depend only on the bulk reaction rate coefficient. In this p
 resentation\, we motivate significance and uncertainties in DMS multiphase
  oxidative fate over polar oceans. To constrain these atmospheric multipha
 se kinetics based on laboratory bulk kinetics and multiphase experiments\,
  we motivate the use of multiphase kinetic models which explicitly represe
 nt physical transport and chemical elementary steps in surface and bulk vo
 lumes of microdroplets. 4:00 pm
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