Development of the SAPRC-07 Chemical Mechanism
and Updated Ozone Reactivity Scales
This page finalized July 18, 2007.
Chair’s Air Pollution Seminar
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Tuesday, August 28, 2007
10:00 a.m. - 12:00 Noon
Byron Sher Auditorium, Second Floor
1001 I Street, Sacramento
This
event is being Webcast, click here to view.
Webcast viewers: Please send your
questions during broadcast to: auditorium@calepa.ca.gov.
Presentation is available at this link.
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Development of the
SAPRC-07 Chemical Mechanism
and Updated Ozone Reactivity Scales
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William P. L. Carter, Ph.D.
Air Pollution Research Center and
College of Engineering Center for Environmental Research and Technology
University of California Riverside
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| An updated version of the SAPRC-99 chemical mechanism, designated SAPRC-07, has been developed. This includes a
complete update of the rate constants and reactions based on current data and evaluations, reformulated aromatics
mechanisms, a representation of chlorine chemistry, a reformulated method to represent peroxy reactions that is
more appropriate for modeling secondary organic aerosol formation, and improved representations for many types
of VOCs. This mechanism was evaluated against the result of ~2400 environmental chamber experiments carried out
in 11 different environmental chambers, including experiments to test mechanisms for over 120 types of VOCs. The
performance of the mechanism in simulating the chamber data was comparable to SAPRC-99, with generally satisfactory
results for most types of VOCs but some increases in biases in simulations of some mixture experiments. The mechanism
was used to derive an update to the MIR and other ozone reactivity scales for almost 1100 types of VOCs. The average
changes in relative MIR values was about 10%, with >90% of the VOCs having changes less than 30%, but with larger
changes for some types of VOCs, including halogenated compounds. Recommendations are given for future mechanism
development research. |
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| William P. L. Carter, Ph.D., holds a joint emeritus appointment at the Air Pollution
Research Center and the College of Engineering Center for Environmental Research and Technology (CE-CERT) at University
of California, Riverside. His research concerns the gas-phase atmospheric reactions of volatile organic compounds
(VOCs) and the assessment of ozone and other impacts of VOCs in the atmosphere. This includes developing chemical
mechanisms for airshed models, conducting environmental chamber experiments to evaluate and improve these mechanisms,
and utilizing them in airshed models to develop ozone reactivity scales for VOCs. Chemical mechanisms he has developed
are being used in airshed models for a number of research and regulatory applications. Ozone reactivity scales
he developed have been incorporated several VOC emissions regulations in California. |
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For more information on this
Seminar, please contact Dongmin Luo
at (916) 324-8496 or send email to dluo@arb.ca.gov.
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For a complete listing of
the ARB Chairman's Series and the related documentation
for each one of the series, please check this page.
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