Environmental Engineering Reference
In-Depth Information
CCOS projects are being coordinated with those sponsored by CRPAQS. Though
the emphases of these two studies are different (i.e., ozone versus particulate matter),
they do share a common study area. Physical and chemical phenomena associated
with ozone formation are also germane to particulate air quality issues. Particular
attention is being given to developing a broad understanding of ozone and particulate
matter air quality phenomena in central California and to identifying appropriate
means for effectively achieving air quality goals.
1. Questions and Answers
Wei Zhou:
How representative was 2000 high ozone and meteorology for the
California air pollution?
Answer:
To determine the representativeness of the CCOS episodic periods, a
number of statistical approaches were taken that included classifying weather
patterns over a medium-length period (13 years), and using CART analyses to
establish relationships between weather types and routinely measured meteoro-
logical parameters, and sub-basin peak ozone levels. With regards to the CCOS
modeling episodes, peak ozone levels in the six Central California sub basins
were, for the most part, historically representative of other periods with similar
meteorology. Further information can be obtained in the report by Lehrman
et al. (2004),
Characterization of the CCOS 2000 Measurement Period
, Final
Report (Contract 01-2CCOS), Technical and Business Systems, Inc., Santa
Rosa, CA, March 1, 2004. This document is available at http://www.arb.ca.gov/
airways/ccos/ccos.htm.
Ron Cohen:
How well does the modeling system perform at describing so-called
non-episode conditions?
Answer:
Model performance for non-episode conditions is being examined in an
ongoing study being conducted by the University of California and Lawrence
Berkeley National Laboratory. Regional model simulations for the CCOS
domain are being made for the entire summer 2000 period. Analysis of these
results will provide insights into how well the modeling system simulates both
episode and non-episode conditions.
Douw Steyn:
Is the data base from this study available for model intercomparison
studies such as AQMETI?
Answer:
The CCOS data base is available for use in model intercomparison
studies. Please contact Ajith Kaduwela at the California Air Resources Board
for further information.
