Environmental Engineering Reference
In-Depth Information
•
The CAMx modeling was performed using the most recent draft emission
inventory available at the time the study was initiated. However, several issues
were noted with that inventory and it has been revised significantly since
then. Studies to reconcile emission inventories with measurements in the
CCOS region indicate an underestimation of total non-methane organic com-
pound to oxides of nitrogen (TNMOC:NO
x
) emission ratios in southern SJV.
Biogenic emissions were significantly different between the July-August and
September episodes.
Based on these findings, we recommend that (1) an updated emission inventory
be implemented and used in the CCOS air quality modeling; (2) the CCOS modeling
domain be nested within a larger regional 12-km domain; (3) research on wildfire
emissions from the fire science community be monitored for improvements in
emission rates, temporalization, spatial allocation, speciation, and plume rise; and
(4) temperature biases in the SJV during the September 2000 episode should be
investigated further.
Acknowledgments and Disclaimer
The work described in this paper was funded by the San
Joaquin Valleywide Air Pollution Study Agency (SJVAPSA) and managed by Dr. Ajith
Kaduwela of the California Air Resources Board (CARB). The authors would like to thank
Dr. Kaduwela and the members of the CCOS Technical Committee for their suggestions and
guidance over the course of the project. The statements and conclusions in this paper are those of
the authors at Sonoma Technology, Inc. and not necessarily those of the CARB, the SJVAPSA,
its Policy Committee, their employees, or their members. The mention of commercial products,
their source, or their use in connection with the material reported herein is not to be construed as
actual or implied endorsement of such products.
References
evaluation of SAQM in Central California and attainment demonstration for the August 3-6,
1990 ozone episode. Report prepared by Technical Support Division, California Air Resources
Board, Sacramento, CA, February.
ENVIRON International Corporation (2004)
User's guide to the Comprehensive Air Quality
Model with Extensions (CAMx). Version 4.00. Prepared by ENVIRON International
Corporation, Novato, CA, January.
National Exposure Research Laboratory (1999) S
cience algorithms of the EPA Models-3
Community Multiscale Air Quality (CMAQ) modeling system. Report prepared by the
National Exposure Research Laboratory, Research Triangle Park, NC, EPA/600/R-99/030
(peer reviewed), March.
San Joaquin Valley Air Pollution Control District (2004)
San Joaquin Valley Air Basin plan
demonstrating attainment of federal 1-hour ozone standards. October.
and Souten D.R. (2004) Evaluation of the 16-20 September 2000 ozone episode for use in
1-hr SIP development in the California Central Valley. Draft final report prepared by Alpine
Geophysics, LLC, Ft. Wright, KY, February.
