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Table of Contents - The Atmospheric Studies Group at TRC

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Section 10: POSTPROCESSORS<br />

<strong>Table</strong> 10-14 (Continued)<br />

CALPOST Control File Inputs - Input <strong>Group</strong> 2<br />

Visibility Parameters<br />

Variable Type Description Default<br />

LAVER logical Method used for the 24h-average <strong>of</strong> percent change <strong>of</strong> light<br />

extinction: Hourly r<strong>at</strong>io <strong>of</strong> source light extinction / background light<br />

extinction is averaged<br />

MVISBK integer Method used to obtain background extinction:<br />

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

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

background 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 d<strong>at</strong>a<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 />

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

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

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 />

F<br />

2<br />

10-56

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