Cooperative Institute for Research in Environmental Sciences at the University of Colorado Boulder

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Atmospheric Chemistry Program Seminar

Atmospheric Chemistry Program Seminar

Photochemical and Dark Ageing of Organic Aerosols by Prof. Sergey Nizkorodov, Department of Chemistry, University of California, Irvine

"Atmospheric aerosols significantly affect air quality, visibility, and global climate. Organic compounds make up a significant, and often dominant, fraction of the atmospheric particulate matter. Primary organic aerosol is emitted in the atmosphere by various sources, and secondary organic aerosol is produced directly in the atmosphere as a result of a complex sequence of reactions that start with the oxidation of volatile organic compounds and end with the condensation of the low-volatility products into particles. What makes the representation of organic aerosols in climate and air quality models challenging is their astonishingly high degree of chemical complexity. Furthermore, the chemical composition of organic aerosols continuously changes as a result of various “ageing” processes, such as photolysis, hydrolysis, oligomerization, oxidation, and other reactions involving aerosol constituents and atmospheric gases. This presentation will examine the role of condensed-phase photochemical processes in the aerosol ageing, i.e., processes initiated by absorption of solar radiation by an organic compound within a particle or cloud/fog droplet. If time permits, we will also discuss “dark” ageing processes, which occur without any involvement of solar radiation and free radicals, and result in the formation of compounds with unusual properties, such as organic compounds capable of absorbing visible radiation (so called “brown carbon”)."

date

Monday, September 17, 2018
12:00pm to 1:00pm

location

Ekeley S274

contact

Anne.Handschy@Colorado.EDU
2018-09-17
 
NCAR Chemistry Seminar

NCAR Chemistry Seminar

A Tale of Two (Plus) Cities: Production, Sources, and Associated Deaths from Urban Secondary Organic Aerosol by Benjamin A. Nault, Department of Chemistry and CIRES University of Colorado, Boulder.

 

Abstract here: https://www2.acom.ucar.edu/sites/default/files/seminars/Seminar%20Announcement_Nault.pdf

Refreshments 3:15 p.m

NCAR Foothills Laboratory

3450 Mitchell Lane, Boulder, CO 80301

FL2-1001, small seminar room

Live webcast:

http://ucarconnect.ucar.edu/live

date

Monday, September 17, 2018
3:30pm to 4:30pm
2018-09-17