Central California Ozone Study (CCOS) - Desert Research Institute

CCOS Field Operations Plan Version 2: 5/31/00
sampling plan using statistical methods for the placement of traffic counters for CCOS. Based
on the results of the scoping study, a field sampling plan will be developed to collect and analyze
hourly traffic count information for the CCOS domain. The day-specific data will be
incorporated into the transportation model.
6.3.2 Gridding of Area Source Emissions
Ozone and aerosol formation models require spatially distributed estimates of precursor
emissions resolved over the entire geographic grid system that defines the modeling domain. In
this project, Sonoma Technology, Inc. will develop base year and future year gridding surrogates
for spatially distributing area source and off-road emission source categories. The spatial
allocation factors will be used to geographically distribute emissions throughout the Central
California Ozone Study (CCOS) domain at a spatial resolution of 1 x 1 km covering all of
California from Shasta to Kern County.
Spatial allocation factors for area and off-road mobile sources will be developed for the
years 2000, 2005, 2010, and 2020 using various sources of data that are representative of the
spatial distribution of emissions activity. These data are referred to as surrogates and commonly
include: demographic and socioeconomic data and land cover/land use data. STI will review
existing area and off-road mobile source surrogate assignments and use new and innovative
methodologies similar to those used in the 1997 South Coast Ozone Study (SCOS97) to assign
surrogates to emissions sources.
Additionally, STI will review and recommend improvements to existing temporal
distributions (hourly, daily, seasonal) of emissions activity for all area and off-road sources. In
order to complete this project, local data will be acquired
6.3.3 Integration of Transportation Data for CCOS Domain and Run DTIM for Entire
Modeling Domain
The goals of this project are: 1) create gridded, hourly on-road mobile source emissions
estimates of PM, CO, NOx, and TOG which are representative of an ozone season episode and a
winter episode for the base year 2000; 2) provide a cost and schedule estimate to create more
refined PM estimates (i.e. EC, OC, SO2, SO4, NH3, Na, Ca, K, Mg, and other PM in lieu of a
total PM estimate; and 3) transfer data and estimation software to the ARB and provide
necessary training so that ARB staff can generate additional on-road mobile source emissions
estimates using other data sets. The contractor is Alpine Geophysics.
6.3.4 Biogenic Emission Model Expansion
Biogenic emissions are calculated using BEIGIS, the ARB’s geographic information
system (GIS) model for estimating biogenic hydrocarbon emissions. Although most of the major
input databases needed to run BEIGIS currently exist, several of these databases specific to the
Central California Ozone Study (CCOS) domain require validation. The first database requiring
field validation is the spatial distribution and identification of vegetation species in natural areas,
as defined by the Gap Analysis Project (GAP). The second is a 1 kilometer resolution leaf area
Chapter 6: EMISSION INVENTORY DEVELOPMENT 6-3