Model
Description
OLD NEW
Meteorology AVN -
Aviation RSM - Relocatable
Spectral
H-Grid 180 km 40
km
V-Grid 1000, 925, 850, ... .99, .98, .96, .94, .92, .88, .85
Time 6 hour 3 hour
Dispersion HYSPLIT3 HYSPLIT4
Type Lagrangian Puff Lagrangian Particle / Puff
V-Mix K-th K-th
H-Mix Top-hat K-th / Gaussian / Top-hat
H-Grid Same as Meteo Independent and variable
V-Grid Same as Meteo Independent and variable
MASS
BALANCE
(Release
= 340 kg)
|
Contour (ng/m3) |
+24h |
+36h |
+48h |
|
0.05 - 0.10 |
1.0
x 1011 m2 |
2.6
x 1011 m2 |
3.8
x 1011 m2 |
|
|
1.0
x 1010 ng/m |
2.6
x 1010 ng/m |
3.8
x 1010 ng/m |
|
0.10 - 0.20 |
5.5
x 1010 m2 |
1.4
x 1011 m2 |
2.5
x 1011 m2 |
|
|
1.1
x 1010 ng/m |
2.8
x 1010 ng/m |
5.0
x 1010 ng/m |
|
0.20 - 0.50 |
|
|
1.0
x 1011 m2 |
|
|
|
|
5.0
x 1010 ng/m |
|
Total |
2.1
x 1010 ng/m |
5.4
x 1010 ng/m |
1.4
x 1011 ng/m |
|
Depth = 1000 m |
21
kg |
54
kg |
140
kg |
|
Aircraft |
+24h |
|
Area |
1.0 x 1011 m2 |
|
Concentration |
3.5 ng/m3 |
|
Total |
3.5 x 1011 ng/m |
|
Depth = 1000 m |
350 kg |
SUMMARY
1)
Model shows similiar horizontal and vertical plume dimensions to measurements
2)
Model shows substantial overprediction of ground-level concentrations
3)
Model prediction of elevated concentrations comparable to aircraft measurements
4)
Therefore the majority of ground-level measurements must be isolated from
tracer plume aloft.
5)
Most models do not account for this decoupling, but mix tracer to the ground
6)
Apparently greater vertical resolution is required to simulate these data
correctly