D-1 

APPENDIX D – CALPOST SCREENING CONFIGURATION

The tables below identify the recommended CALPOST processor screening configurations for 

CENRAP BART modeling. 

Table D-1. Input Groups in the CALPOST Processor Control File. 

Group Description 

Applicable to 

CENRAP BART 

0 Input and output file names Yes 

1 General Run Control Parameters Yes 

2 Visibility Parameters Yes 

3 Output Options Yes 

Table D-2. CALPOST Processor Input Group 1: General Run Control Parameters. 

 

Parameter DEFAULT CENRAP Comments 

ISYR -- 2001 Starting year 

ISMO -- 1 Starting month 

ISDY -- 1 Starting day 

ISHR -- 0 Starting hour 

NPER -- 8760 Number of periods to process 

NREP 1 1 Process every hour of data? Yes = 1 

ASPEC -- VISIB Process species for visibility 

ILAYER 1 1 Layer/deposition code; 1 for CALPUFF 

concentrations 

A 0.0 0.0 Scaling factor, slope 

B 0.0 0.0 Scaling factor, intercept 

LBACK F F Add hourly background concentrations or 

fluxes? 

LG F F Process gridded receptors? 

LD F T Process discrete receptors? 

LCT F F Process complex terrain receptors? 

LDRING F F Report receptor ring results? 

NDRECP -1 -1 Select all discrete receptors 

IBGRID -1 -1 X index of LL corner of receptor grid 

JBGRID -1 -1 Y index of LL corner of receptor grid

IEGRID -1 -1 X index of UR corner of receptor grid
 

D-2 

JEGRID -1 -1 X index of UR corner of receptor grid

NGONOFF 0 0 Number of gridded receptor rows 

NGXRECP 1 0 Exclude specific gridded receptors, Yes = 0 

Table D-3. CALPOST Processor Input Group 2: Species Processing Information. 

 

Parameter DEFAULT CENRAP Comments 

RHMAX 98 95 Maximum RH (%) used in particle growth curve 

LVSO4 T T Compute light extinction for sulfate? 

LVNO3 T T Compute light extinction for nitrate?

LVOC T T Compute light extinction for organic carbon?

LVMPC T T Compute light extinction for coarse particles?

LVMPF T T Compute light extinction for fine particles?

LVEC T T Compute light extinction for elemental carbon?

LVBK T T Include background in extinction calculation? 

SPECPMC PMC PMC Coarse particulate species 

SPECPMF PMF PM10 Fine particulate species 

EEPMC 0.6 0.6 Extinction efficiency for coarse particulates 

EEPMF 1.0 1.0 Extinction efficiency for fine particulates

EEPMCBK 0.6 0.6 Extinction efficiency for coarse part. background

EESO4 3.0 3.0 Extinction efficiency for ammonium sulfate

EENO3 3.0 3.0 Extinction efficiency for ammonium nitrate

EEOC 4.0 4.0 Extinction efficiency for organic carbon

EESOIL 1.0 1.0 Extinction efficiency for soil

EEEC 10.0 10.0 Extinction efficiency for elemental carbon

MVISBK 2 6 Method 6 for background light extinction: 

Compute extinction from speciated PM 

measurements. FLAG RH adjustment factor 

applied to observed & modeled sulfate and nitrate

BEXTBTBK -- 12 Background extinction for MVISBK=1 (1/Mm) 

RHFRAC -- 10 Percentage of particles affected by RH 

RHFAC 12*value Depends 

on Class 

I Area 

Extinction coefficients for modeled and 

background hygroscopic species computed using 

EPA (2003) monthly RH adjustment factors 

BKSO4 0.12 0.12 Background sulfate extinction coeff – west 

BKNO3 0.10 0.10 Background nitrate extinction coeff – west 

BKPMC 3.00 3.00 Background coarse part. extinction coeff – west 

BKSOC 0.47 0.47 Background organic carbon extinct. coeff – west 
 

D-3 

BKSSOIL 0.50 0.50 Background soil extinction coeff – west 

BKSEC 0.02 0.02 Background elem. carbon extinct. coeff – east 

BKSO4 0.23 0.23 Background sulfate extinction coeff – east 

BKNO3 0.10 0.10 Background nitrate extinction coeff – east 

BKPMC 3.00 3.00 Background coarse part. extinction coeff – east 

BKSOC 1.40 1.40 Background organic carbon extinct. coeff – east 

BKSSOIL 0.50 0.50 Background soil extinction coeff – east 

BKSEC 0.02 0.02 Background elem. carbon extinct. coeff – east 

BEXTRAY 10.0 10.0 Extinction due to Rayleigh scattering (1/Mm) 

Table D-4. CALPOST Processor Input Group 3: Output Options. 

 

Parameter DEFAULT CENRAP Comments 

LDOC F F Print documentation image? 

IPRTU 1 3 Print output units (μg/m3

) for concentrations and 

(μg/m2/sec) for deposition 

L1HR T F Report 1 hr averaging times 

L3HR T F Report 3 hr averaging times 

L24HR T T Report 24 hr averaging times 

LRUNL T F Report run-length (annual) averaging times 

LT50 T F Top 50 table 

LTOPN F F Top ‘N’ table 

NTOP 4 4 Number of ‘Top-N’ values at each receptor 

ITOP 1,2,3,4 1,2,3,4 Ranks of ‘Top-N’ values at each receptor 

LEXCD F F Threshold exceedances counts 

THRESH1 -1.0 -1.0 Averaging time threshold for 1 hr averages 

THRESH3 -1.0 -1.0 Averaging time threshold for 3 hr averages 

THRESH24 -1.0 -1.0 Averaging time threshold for 24 hr averages 

THRESHN -1.0 -1.0 Averaging time threshold for NAVG-hr averages 

NDAY 0 0 Accumulation period, days 

NCOUNT 1 1 Number of exceedances allowed 

LECHO F F Echo option 

LTIME F F Time series option 

LPLT F F Plot file option 

LGRD F F Use grid format instead of DATA format 

LDEBUG F F Output information for debugging?