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Table of Contents - The Atmospheric Studies Group at TRC

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Section 10: POSTPROCESSORS<br />

<strong>Table</strong> 10-15 (Continued)<br />

Sample CALPOST Control File (CALPOST.INP)<br />

Method used for background light extinction<br />

(MVISBK) -- Default: 2 ! MVISBK = 2 !<br />

1 = Supply single light extinction and hygroscopic fraction<br />

- IWAQM (1993) RH adjustment applied to hygroscopic background<br />

and modeled sulf<strong>at</strong>e and nitr<strong>at</strong>e<br />

2 = Compute extinction from speci<strong>at</strong>ed PM measurements (A)<br />

- Hourly RH adjustment applied to observed and modeled sulf<strong>at</strong>e<br />

and nitr<strong>at</strong>e<br />

- RH factor is capped <strong>at</strong> RHMAX<br />

3 = Compute extinction from speci<strong>at</strong>ed PM measurements (B)<br />

- Hourly RH adjustment applied to observed and modeled sulf<strong>at</strong>e<br />

and nitr<strong>at</strong>e<br />

- Receptor-hour excluded if RH>RHMAX<br />

- Receptor-day excluded if fewer than 6 valid receptor-hours<br />

4 = Read hourly transmissometer background extinction measurements<br />

- Hourly RH adjustment applied to modeled sulf<strong>at</strong>e and nitr<strong>at</strong>e<br />

- Hour excluded if measurement invalid (missing, interference,<br />

or large RH)<br />

- Receptor-hour excluded if RH>RHMAX<br />

- Receptor-day excluded if fewer than 6 valid receptor-hours<br />

5 = Read hourly nephelometer background extinction measurements<br />

- Rayleigh extinction value (BEXTRAY) added to measurement<br />

- Hourly RH adjustment applied to modeled sulf<strong>at</strong>e and nitr<strong>at</strong>e<br />

- Hour excluded if measurement invalid (missing, interference,<br />

or large RH)<br />

- Receptor-hour excluded if RH>RHMAX<br />

- Receptor-day excluded if fewer than 6 valid receptor-hours<br />

6 = Compute extinction from speci<strong>at</strong>ed PM measurements<br />

- FLAG RH adjustment factor applied to observed and<br />

modeled sulf<strong>at</strong>e and nitr<strong>at</strong>e<br />

7 = Compute extinction from speci<strong>at</strong>ed PM measurements as in [2]<br />

for 'unobstructed' conditions; replace with extinction from<br />

observed visual range for fog/precipit<strong>at</strong>ion conditions<br />

- Hourly RH adjustment applied to observed and modeled sulf<strong>at</strong>e<br />

and nitr<strong>at</strong>e<br />

- RH factor is capped <strong>at</strong> RHMAX<br />

- When fog/precip is observed, replace computed Bext with:<br />

Bext(1/Mm) = 3912/VR(km)<br />

Additional inputs used for MVISBK = 1:<br />

--------------------------------------<br />

Background light extinction (1/Mm)<br />

(BEXTBK) -- No default ! BEXTBK = 12.0 !<br />

Percentage <strong>of</strong> particles affected by rel<strong>at</strong>ive humidity<br />

(RHFRAC) -- No default ! RHFRAC = 10.0 !<br />

Additional inputs used for MVISBK = 6:<br />

--------------------------------------<br />

Extinction coefficients for hygroscopic species (modeled and<br />

background) are computed using a monthly RH adjustment factor<br />

in place <strong>of</strong> an hourly RH factor (VISB.DAT file is NOT needed).<br />

Enter the 12 monthly factors here (RHFAC). Month 1 is January.<br />

(RHFAC) -- No default ! RHFAC = 0.0, 0.0, 0.0, 0.0,<br />

0.0, 0.0, 0.0, 0.0,<br />

0.0, 0.0, 0.0, 0.0 !<br />

10-71

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