Following are the MM5 horizontal grid and vertical layer structures used in the Houston-Galveston-Brazoria ozone SIP Mid-Course Review (MCR) modeling.
Horizontal Grid Structure
The MM5 modeling domain is defined with the Lambert Conformal Conic map projection:
| First True Latitude (Alpha): |
30°N |
| Second True Latitude (Beta): |
60°N |
| Central Longitude (Gamma): |
100°W |
| Projection Origin: |
(100°W, 40°N) |
| Spheroid: |
Perfect Sphere, Radius = 6370 km |
The horizontal modeling domain grid structure consists a coarse grid continental domain and four nested subdomains: Regional Domain, East Texas Domain, Houston/Galveston/Brazoria-Beaumont/Port Arthur (HGBPA) Domain, and optional Houston/Galveston Bay (HG) Domain.
| Domain Name |
Range (km) |
Number of Grid Points |
Cell Size (km) |
|---|
| Easting |
Northing |
Easting |
Northing |
Easting |
Northing |
|---|
| Continental Domain |
(-2808,2808) |
(-2268,2268) |
53 |
43 |
108 |
108 |
|---|
| Regional Domain |
(-324,1620) |
(-1728,216) |
55 |
55 |
36 |
36 |
|---|
| East Texas Domain |
(-72,1116) |
(-1548,-360) |
100 |
100 |
12 |
12 |
|---|
| HGBPA Domain |
(216,816) |
(-1356,-816) |
151 |
136 |
4 |
4 |
|---|
| HG Domain |
(424,520) |
(-1156,-1076) |
97 |
81 |
1 |
1 |
|---|
HGB SIP MCR MM5 Modeling Domain
 |
Vertical Layer Structure
| Layer | Sigma | Layer Top
(m AGL) | Center
(m AGL) | Thickness
(m) | | 43 | 0.000 | 20806.8 | 20362.1 | 889.6 | | 42 | 0.010 | 19917.3 | 19341.4 | 1151.7 | | 41 | 0.025 | 18765.6 | 18117.9 | 1295.3 | | 40 | 0.045 | 17470.3 | 16918.8 | 1103.1 | | 39 | 0.065 | 16367.2 | 15773.2 | 1188.1 | | 38 | 0.090 | 15179.1 | 14662.7 | 1032.8 | | 37 | 0.115 | 14146.3 | 13602.4 | 1087.8 | | 36 | 0.145 | 13058.5 | 12577.6 | 961.9 | | 35 | 0.175 | 12096.6 | 11596.6 | 1000.0 | | 34 | 0.210 | 11096.7 | 10587.9 | 1017.5 | | 33 | 0.250 | 10079.1 | 9622.9 | 912.6 | | 32 | 0.290 | 9166.6 | 8752.3 | 828.6 | | 31 | 0.330 | 8338.0 | 7958.1 | 759.8 | | 30 | 0.370 | 7578.2 | 7269.5 | 617.3 | | 29 | 0.405 | 6960.9 | 6671.3 | 579.2 | | 28 | 0.440 | 6381.7 | 6108.8 | 545.8 | | 27 | 0.475 | 5835.9 | 5577.7 | 516.3 | | 26 | 0.510 | 5319.5 | 5108.7 | 421.6 | | 25 | 0.540 | 4898.0 | 4695.9 | 404.0 | | 24 | 0.570 | 4493.9 | 4299.9 | 388.0 | | 23 | 0.600 | 4105.9 | 3919.3 | 373.3 | | 22 | 0.630 | 3732.7 | 3552.8 | 359.7 | | 21 | 0.660 | 3373.0 | 3199.5 | 347.1 | | 20 | 0.690 | 3025.9 | 2858.2 | 335.5 | | 19 | 0.720 | 2690.4 | 2528.1 | 324.6 | | 18 | 0.750 | 2365.8 | 2234.4 | 262.8 | | 17 | 0.775 | 2103.0 | 1974.9 | 256.1 | | 16 | 0.800 | 1846.9 | 1721.9 | 249.8 | | 15 | 0.825 | 1597.0 | 1475.1 | 243.9 | | 14 | 0.850 | 1353.2 | 1281.4 | 143.6 | | 13 | 0.865 | 1209.6 | 1138.8 | 141.6 | | 12 | 0.880 | 1068.0 | 998.1 | 139.7 | | 11 | 0.895 | 928.3 | 859.4 | 137.8 | | 10 | 0.910 | 790.5 | 745.0 | 90.9 | | 9 | 0.920 | 699.6 | 654.6 | 90.1 | | 8 | 0.930 | 609.5 | 564.9 | 89.3 | | 7 | 0.940 | 520.2 | 476.0 | 88.5 | | 6 | 0.950 | 431.7 | 387.8 | 87.8 | | 5 | 0.960 | 343.9 | 300.4 | 87.0 | | 4 | 0.970 | 256.9 | 213.7 | 86.3 | | 3 | 0.980 | 170.5 | 127.7 | 85.6 | | 2 | 0.990 | 84.9 | 59.4 | 51.0 | | 1 | 0.996 | 33.9 | 16.9 | 33.9 | | 0 | 1.000 | 0.0 | 0.0 | 0.0 |
Note: AGL - Above ground level.
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