CRC Report No. A-34 - Coordinating Research Council

April 2005
Table 4-1. Categories identified by CMB in experiments 1-8 of Round 1
and the way they were matched to A-34 categories actually
present in the “ambient” samples......................................................................... 4-3
Table 4-2. Source category contributions to the sum of PAMS emissions
for 9 cell areas surrounding each receptor in experiment 1 on
August 5, 1997................................................................................................... 4-21
FIGURES
Figure ES-1. Comparison of CMB contributions to actual contributions
for experiment 1 at each receptor averaged over all hours in
(a) Round 2b and (b) Round 4 ...........................................................................ES-2
Figure ES-2. The effects of chemical reaction on concentrations of high,
medium and low reactivity source categories at a downwind
receptor (Crestline). ...........................................................................................ES-4
Figure ES-3. Actual and emissions contributions in experiment 12 -(with no chemical
reactions) by receptor, averaged over all hours .................................................ES-5
Figure 2-1. CAMx photochemical modeling domain showing terrain
height (m) and receptor locations for the CMB analysis ..................................... 2-2
Figure 2-2. Comparison of the sum of PAMS species to Total NMHC
Figure 2-3.
for 24 morning samples from Los Angeles in October 1995............................. 2-12
Average composition (weight percent) and range for
PAMS species in 22 morning samples from Los Angeles in
October 1995. Shown on an absolute scale (top) and log scale (bottom)......... 2-13
Figure 2-4. Spatial/temporal variation in source profiles for three A-34
categories (1, 16 and 21) in experiment 1. The symbols show
the median PAMS fraction and the lines the inter-quartile range
(25 th to 75 th percentiles). .................................................................................... 2-19
Figure 2-5.
Figure 3-1.
Figure 3-2.
Figure 4-1.
Figure 4-2.
Figure 4-3.
Mean source profiles for experiment 1. The profiles are for
55 PAMS species over 22 source categories. These are mean
profiles because each A-34 category may combine several SCCs
that have different speciation profiles................................................................ 2-20
Sensitivity of source attribution to three different gasoline
exhaust profile and inclusion of a regional background profile.
Removing regional background shift attribution to mostly
gasoline exhaust and small amount of diesel exhaust........................................ 3-13
LDV and HDV profiles derived from the virtual tunnel
study in comparison to the default light-duty gasoline and
heavy-duty diesel exhaust profiles used in Round 1.......................................... 3-14
Comparison of CMB contributions to actual contributions
for experiment 1 at each receptor averaged over all hours in
(a) Round 1 (b) Round 2 and (c) Round 4. .......................................................... 4-3
Comparison of CMB contributions to actual contributions
for experiments 1-8 averaged over all receptors and hours in
(a) Round 1 (b) Round 2 and (c) Round 4.. ......................................................... 4-9
Comparison of CMB contributions to actual contributions
for experiment 1 in Round 4 at each receptor averaged over
(a) 6-9 am (b) 1-4 pm and (c) all hours.............................................................. 4-12
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