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ORGANIZER;CN=Natalie Leung:mailto:[log in to unmask]
ATTENDEE;ROLE=REQ-PARTICIPANT;PARTSTAT=NEEDS-ACTION;RSVP=TRUE;CN=LISTSERV.s
ocaar-l:mailto:[log in to unmask]
ATTENDEE;ROLE=REQ-PARTICIPANT;PARTSTAT=NEEDS-ACTION;RSVP=TRUE;CN=Alex.Lee@e
c.gc.ca:mailto:[log in to unmask]
ATTACH:CID:[log in to unmask]
DESCRIPTION;LANGUAGE=en-US:Hi Everyone\,\nSOCAAR is pleased to announce our
next SOCAAR Seminar:\n\nWednesday\, March 1\, 2023\n3:00PM - 4:00PM EDT\n
\nDr. Alex Lee\nResearch Scientist\nAir Quality Research Division a\nEnvir
onment and Climate Change Canada (ECCC)\n\n\n\n\nFormation and sources of
atmospheric brown carbon: Field observations from tropical urban environme
nt and laboratory studies for aqueous-phase processing\n\nAbstract:\nAtmos
pheric carbonaceous aerosols can have significant impacts on both air qual
ity and climate. However\, impacts of atmospheric brown carbon (BrC)\, the
light absorbing fraction of organic aerosols (OAs) that can heat up the a
tmosphere\, on global and regional climate are subject to large uncertaint
ies due to the lack of understanding on their sources\, formation processe
s and atmospheric evolution. While biomass burning has been recognized as
the major sources of atmospheric BrC in global scale\, the contributions o
f other primary sources and secondary processes to atmospheric BrC remain
less understood. The first part of this talk will focus on the field obser
vations in Singapore\, a well-developed coastal city in warm and humid tro
pical region\, based on a novel combination of high resolution aerosol mas
s spectrometry and aethalometer measurements. The results provide evidence
that local combustion emissions and fresh secondary OA (SOA) formed with
industrial influence can be important sources of BrC in urban environments
\, and biomass burning-derived BrC observed during the haze episode in the
Southeast Asian region are susceptible to significant degradation in ligh
t absorptivity during regional transport. The second part will present lab
oratory observations that shows the dynamic impacts of relative humidity o
n secondary BrC formation in aqueous-phase upon fast droplet evaporation t
hat is relevant to atmospheric cloud processing. The potential effects of
anthropogenic-biogenic interactions on secondary BrC formation via aqueous
-phase processing will be also discussed.\n_______________________________
_________________________________________________\nJoin us\nIn Person: 20
0 College Street - Wallberg Building - Room 407\nOr\nOnline: Microsoft Te
ams meeting\nJoin on your computer\, mobile app or room device\nClick here
to join the meeting\nMeeting ID: 254 546 422 904\n
Passcode: edCowE\nDownload Teams | Join on the web\nOr call in (audio only)\n+1 647-794-1609\,\,403430
913# Canada\, Toronto\nPhone Conference
ID: 403 430 913#\nFind a local number | Reset PIN\nLearn More | Meeting options[log in to unmask]&messageId=0&language=en-US>\n_______________
_________________________________________________________________\n\n
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SUMMARY;LANGUAGE=en-US:SOCAAR Seminar - Dr. Alex Lee
DTSTART;TZID=Eastern Standard Time:20230301T150000
DTEND;TZID=Eastern Standard Time:20230301T160000
CLASS:PUBLIC
PRIORITY:5
DTSTAMP:20230224T141316Z
TRANSP:OPAQUE
STATUS:CONFIRMED
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