Documentation of the Evaluation of CALPUFF and Other Long ...

Table 4‐6. CALPUFF dispersion options examined in the CALPUFF sensitivity tests.
Experiment MDISP MCTURB Comment
CAL 2 1 Dispersion coefficients from internally calculated sigma‐v and
sigma‐w using micrometeorological variables and CALPUFF
algorithms
AER 2 2 Dispersion coefficients from internally calculated sigma‐v and
sigma‐w using micrometeorological variables and AERMOD
algorithms
PG 3 ‐‐ PG dispersion coefficients for rural areas and MP coefficients
for urban areas
The CALMET and CALPUFF simulations used for the sensitivity analyses were updated from the
BASE case model configuration that was designed to be consistent with the 1998 EPA study by
using recommended settings for many variables from the August 2009 EPA Clarification
Memorandum. A summary of CALMET parameters that changed from the BASE case scenarios
for the CALPUFF sensitivity tests are presented in Table 4‐7.
Table 4‐7. CALMET wind field parameters for the SRL75 tracer experiment.
CALMET
Option
2009
EPA‐FLM
Default BASE EXP1A EXP1B EXP1C
NOOBS 0 0 0 1 2
ICLOUD 0 0 0 0 3
IEXTRP ‐4 4 ‐4 ‐4 1
IPROG 14 0 14 14 14
ITPROG 0 0 0 1 2
ZIMIN 50 100 50 50 50
ZIMAX 3000 3200 3000 3000 3000
RMAX1 100 20 100 100 50
RMAX2 200 50 200 200 100
4.2.4 CALPUFF/MMIF Sensitivity Tests
With the MMIF software tool designed to reformat the MM5/WRF meteorological model
output data for input into CALPUFF, there are much less options available and hence much
fewer sensitivity tests as shown in Table 4‐8.
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