Air Quality Management in California: Sensitivity to Changing Climate
This page finalized June 26, 2007
Chair’s Air Pollution Seminar
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Tuesday, July 17, 2007
1:30 p.m. - 3:30 p.m.
Sierra Hearing Room, Second Floor
1001 I Street, Sacramento
This
event is being Webcast, click here to view
Webcast viewers: Please send your
questions during broadcast to: sierrarm@calepa.ca.gov
Presentation is available at this link
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Air Quality Management
in California:
Sensitivity to Changing Climate
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Robert Harley, Ph.D.,
Department of Civil and Environmental Engineering
University of California Berkeley
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Using a chemical transport model to simulate ozone concentrations in Central California, scientists at Berkeley
evaluate the effects of variables associated with future changes in climate and ozone precursor emissions, including:
(1) increasing temperature; (2) increasing atmospheric water vapor; (3) increasing biogenic volatile organic compound
(VOC) emissions due to temperature change; (4) changing pollutant concentrations in Pacific Ocean inflow; and (5)
projected decreases in anthropogenic emissions in California by 2050. The combined effect of changes (1)-(4) is
to offset some of the benefits of reducing anthropogenic emissions (5); the offsetting effects are greatest in
coastal areas.
Scientists also studied the effects of day-to-day temperature variability on motor vehicle-related VOC emissions
using a chemical mass balance method applied to an 8-week summer season time series of speciated VOC measurements
at Granite Bay (near Sacramento, California). The proportion of gasoline headspace vapors (relative to total vehicle-related
VOC) in ambient air increases on hotter days as expected, though emission inventories may contain more vapor-type
emissions than are reflected in atmospheric measurements. This analysis is relevant to understanding the effects
of day-to-day meteorological variability and climate change on anthropogenic VOC emissions. |
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| Robert Harley, Ph.D., is a professor in the Department of Civil and Environmental
Engineering at the University of California, Berkeley, where he has been on the faculty since 1993. He holds a
bachelor's degree in Engineering Science (Chemical Engineering option) from the University of Toronto, and both
M.S. and Ph.D. in Environmental Engineering Science from the California Institute of Technology (Caltech). In addition
to air quality modeling research, Dr. Harley has led a series of field measurement studies at the Caldecott tunnel
that describe downward trends in California motor vehicle emissions and the effects of fuel changes on emissions. |
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For more information on this
Seminar please contact:
Jim Pederson at (916) 322-7221 or send email to: jrpeders@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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version of this page please click on the "Print Friendly" option at the very top of this page.
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Main Seminar Series Page
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Research
Activities
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