Document ID: EPA-HQ-OAR-2003-0053-1719
Agency: epa
Document Type: Supporting & Related Material
Title: 
Posted Date: 2004-07-24T04:00Z

­
1
­
CMAQ
Model
Configuration
for
the
CAIR
Modeling
Platform
1.
CMAQ
Modeling
Platform
Model
version:
CMAQ
version
4.3
(
also
referred
as
PAR5
version)
Model
dimensions:
148
*
112
*
14
(
x
*
y
*
z)
Model
resolution:
36
x
36
km
horizontal
grid,
14
logarithmic
structure
vertical
layers
(
See
Below)
Model
domain:
Nationwide
domain
centered
at
97
degrees
with
transects
at
33
and
45
degrees
on
a
Lambert
conformal
map
projection
Model
vertical
layer
structure:

14
layers
Sigma
Height
(
m)
Pressure
(
mb)
0
1.00
0
1000
1
0.995
38
995.5
2
0.990
77
991
3
0.980
154
982
4
0.960
310
964
5
0.940
469
946
6
0.910
712
919
7
0.860
1130
874
8
0.800
1657
820
9
0.740
2212
766
10
0.650
3108
685
11
0.550
4212
595
12
0.400
6154
460
13
0.200
9626
280
14
0.000
15676
100
Model
dates:
1/
1/
2001
­
12/
31/
2001
Model
initialization:
­
CMAQ
was
run
as
quarterly
simulations
each
with
a
10
days
ramp­
up
(
e.
g.
the
model
run
for
the
1st
quarter:
January,
February
and
March
2001
started
on
December
22,
2000)

2.
CMAQ
Model
Configuration
Gas­
Phase
Chemical
Mechanism:
CB­
IV
with
updated
Isoprene
chemistry
Chemical
Solver:
Euler
Backward
Iterative
(
EBI)
scheme
PM
Module:
Three­
mode
approach:
One
coarse
mode,
two
fine
modes
with
variable
standard
deviations
Inorganic
PM
module:
ISORROPIA
Organic
PM
module:
SOA
module
based
on
Odum/
Griffin
et
al.,
(
1997,
1999)
Advection
Scheme
(
vertical
and
Horizontal):
Piecewise
Parabolic
Method
(
PPM)
scheme
Vertical
Diffusion:
K­
Theory
Eddy
diffusivity
scheme
Dry
Deposition:
M3DRY
module,
modified
RADM
scheme
with
Pleim­
Xiu
land
surface
model
Aqueous
Chemistry:
RADM
Bulk
scheme
Cloud
Scheme:
RADM
Cloud
scheme
Vertical
Coordinate:
Terrain­
following
Sigma
coordinate