Volume 1 - The Atmospheric Studies Group at TRC
Volume 1 - The Atmospheric Studies Group at TRC
Volume 1 - The Atmospheric Studies Group at TRC
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Table 4-5<br />
Source Characteriz<strong>at</strong>ion for Pismo Beach, California Tracer Releases<br />
D<strong>at</strong>e X* (km) Y* (km)<br />
Ht.<br />
(m)<br />
Elev.<br />
(m)<br />
Diam.<br />
(m)<br />
W<br />
(m/s)<br />
T<br />
(ºK)<br />
Hb<br />
(m)<br />
Lb<br />
(m)<br />
12/8/1981 709.633 3880.150 13.1 0.0 .02 0.01 270.0 7.0 20.0<br />
12/11/1981 709.889 3882.651 13.1 0.0 .02 0.01 270.0 7.0 20.0<br />
12/13/1981 709.778 3880.685 13.1 0.0 .02 0.01 270.0 7.0 20.0<br />
12/14/1981 710.065 3881.406 13.1 0.0 .02 0.01 270.0 7.0 20.0<br />
12/15/1981 710.057 3881.759 13.1 0.0 .02 0.01 270.0 7.0 20.0<br />
6/21/1982 709.620 3880.682 13.6 0.0 .02 0.01 270.0 7.0 20.0<br />
6/22/1982 709.415 3876.411 13.6 0.0 .02 0.01 270.0 7.0 20.0<br />
6/24/1982 709.811 3879.268 13.6 0.0 .02 0.01 270.0 7.0 20.0<br />
6/25/1982 709.649 3879.445 13.6 0.0 .02 0.01 270.0 7.0 20.0<br />
6/27/1982 709.754 3881.752 13.6 0.0 .02 0.01 270.0 7.0 20.0<br />
* Loc<strong>at</strong>ions are in the UTM (Zone 10N) map projection with d<strong>at</strong>um NAS-C<br />
Meteorological Processing<br />
Meteorological d<strong>at</strong>a files for applying CALMET/CALPUFF to the Pismo Beach<br />
study are developed primarily from files used to run OCD4, with supplemental cloud<br />
observ<strong>at</strong>ions from the Santa Maria Airport loc<strong>at</strong>ed about 19 km to the ESE. <strong>The</strong><br />
“release” meteorology identified for OCD4 is used to construct represent<strong>at</strong>ive<br />
SEA.DAT (over w<strong>at</strong>er) and SURF.DAT (over land) input files for the tracer-release<br />
days. Temper<strong>at</strong>ures are measured <strong>at</strong> 7m above the w<strong>at</strong>er, and wind speed is measured<br />
<strong>at</strong> 20.5m. Because CALMET accepts a single measurement height for the speed and<br />
temper<strong>at</strong>ure in the SEA.DAT file, the wind speed is profiled from the anemometer<br />
height to 7m for use in the SEA.DAT file. Boundary layer parameters computed by<br />
OCD are used with Monin-Obukhov similarity profiles to compute the wind speed<br />
adjustment. Wind speeds <strong>at</strong> 20.5m are used in the SURF.DAT file.<br />
Wind directions used in the OCD4 d<strong>at</strong>asets are those th<strong>at</strong> align the source and the<br />
sampler with the peak concentr<strong>at</strong>ion each hour. This allows the evalu<strong>at</strong>ion to focus<br />
on processes other than the net transport direction. <strong>The</strong>se directions are used for all<br />
CALMET input files.<br />
<strong>The</strong> SEA.DAT st<strong>at</strong>ion is placed <strong>at</strong> the release loc<strong>at</strong>ion appropri<strong>at</strong>e for the time<br />
period, while the SURF.DAT st<strong>at</strong>ion is placed onshore <strong>at</strong> (719, 3879).<br />
Final Report Vol.1 41