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SUMMARY:In Situ Measurements Of Factors Controlling Atmospheric Particle De
 position
LOCATION:Chemistry A101
TZID:America/Denver
DTSTART:20194101T000000
UID:2026-04-22-22-20-08@natsci.colostate.edu
DTSTAMP:20260422T222008
Description:Research Seminar Abstract\n\nCondensed phase matter in the atmo
 sphere perturbs the earth’s radiative balance\, impacts climate\, advers
 ely affects human and biological health\, degrades visibility\, affects cl
 oud formation\, and alters atmospheric chemistry. The residence time of co
 ndensed phase matter in the atmosphere is a function of its sources and si
 nks. Black carbon (BC) is one form of condensed phase matter in the atmosp
 here that impacts atmospheric temperature\, cloud formation and properties
 \, the albedo of snow and ice surfaces\, and the timing of snowmelt. Param
 eterization of BC dry deposition is particularly limited due to the lack o
 f available instrumentation for measuring the process\, and thus there is 
 a lack of observational datasets with which to evaluate existing models. W
 e present observations of dry and wet deposition rates of size-resolved re
 fractory black carbon (rBC)\, coated rBC\, and total aerosol number by edd
 y covariance technique using a single particle soot photometer (SP2\; Drop
 let Measurement Technologies Inc.) and ultra high sensitivity aerosol spec
 trometer (UHSAS\; Droplet Measurement Technologies Inc.). Using these dat
 a\, we show that wet deposition dominates the removal of rBC from the atmo
 sphere and that a size-dependent loss rate exists for these particles and 
 that the size-dependent loss of rBC is influenced by the chemistry occurri
 ng at the surface of the particle. These observational data allow for a mo
 re complete evaluation of existing climate models and the development of a
  tractable parametrization for use in global climate models.   4:00 pm
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