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ORGANIZER;CN=Natalie Leung:mailto:[log in to unmask]
ATTENDEE;ROLE=REQ-PARTICIPANT;PARTSTAT=NEEDS-ACTION;RSVP=TRUE;CN="SOCAAR-l:
Southern Ontario Centre for Atmospheric Aerosol Research":mailto:SOCAAR-L@l
istserv.utoronto.ca
ATTENDEE;ROLE=REQ-PARTICIPANT;PARTSTAT=NEEDS-ACTION;RSVP=TRUE;CN=reobrien@w
m.edu:mailto:[log in to unmask]
ATTENDEE;ROLE=REQ-PARTICIPANT;PARTSTAT=NEEDS-ACTION;RSVP=TRUE;CN=Jennifer M
urphy:mailto:[log in to unmask]
ATTACH:CID:[log in to unmask]
DESCRIPTION;LANGUAGE=en-US:Hi Everyone\,\n\nSOCAAR is pleased to announce o
ur first SOCAAR Seminar for 2021-2022.\n\n\n\n\n\n\nWednesday\, November 3
\, 2021\n\n3:00 - 4:00PM\n\n\n\nRachel O'Brien\n\nAssistant Professor\n\nC
hemistry Department\nCollege of William and Mary\n\n\n\n\nPhotolysis of at
mospheric organic aerosol: chemical transformations and photo bleaching\n\
n\n\nBrown carbon (BrC) in aerosol particles and cloud droplets can contri
bute to climate warming by absorbing radiation in the visible region of th
e solar spectrum. Large uncertainties remain in our parameterization of th
is warming\, in part due to a lack of knowledge about atmospheric lifetime
s for the chromophores (the light absorbing structures in BrC molecules).
An important removal pathway involves chemical transformations that fragme
nt the chromophore\, thus removing its ability to absorb visible light. Ho
wever\, the rates measured for this removal pathway in the laboratory are
much shorter than what is observed in ambient measurements. There also can
be different amounts of photo-resistant BrC\, which is a fraction of the
mixture that does not rapidly bleach and therefore affects the practical l
ifetime of the BrC. An important BrC source in the atmosphere is biomass b
urning and the overall photochemical decay rates for these emissions are i
mportant to quantify to improve our parameterizations for their radiative
effects. In this talk\, I will be combining results from work in our lab\,
along with a broader review of prior literature of photochemical bleachin
g\, to evaluate gaps in our ability to predict the observed ambient remova
l rates using laboratory measurements. By probing complex mixtures from re
cent biomass burning experiments (e.g. FIREX samples)\, I will demonstrate
that our current measured rates in the laboratory are overestimated and t
hat a slower photolysis rate\, as well as a potential gas-phase oxidation
rate\, should be included to better predict BrC lifetimes in the atmospher
e.\n\n\n\n\n\n____________________________________________________________
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nguage=en-US>\n___________________________________________________________
_____________________\n\n
UID:040000008200E00074C5B7101A82E00800000000A09BFE591CCBD701000000000000000
0100000007B64214A0CB91E44899E29B65C647DC1
SUMMARY;LANGUAGE=en-US:SOCAAR Seminar - Rachel O’Brien
DTSTART;TZID=Eastern Standard Time:20211103T150000
DTEND;TZID=Eastern Standard Time:20211103T160000
CLASS:PUBLIC
PRIORITY:5
DTSTAMP:20211027T143902Z
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