Volume 1 - The Atmospheric Studies Group at TRC

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Chevron Platform 28A served as the SF 6 tracer release site on seven of the test days, and a 20m boat was used on two of the days due to the prevailing wind direction. Platform 28A is located 6.75 km from shore, and the tracer was released 13m above mean low water. The boat locations used are about four km from shore, and the tracer release was from a mast 13m above the water. Thirty-five (35) samplers placed in a single arc along the coast over a span of about 17 km provide sequential hour-averaged concentrations. Meteorological data were obtained at Platform 28A, at a 10m mast installed on the shore 5m to 20m from the water, and at a 25m tower located 2 km inland. Horizontal and vertical profiles of temperature, dew-point temperature and turbulence were obtained by aircraft. The OCD4 evaluation dataset (DiCristofaro and Hanna, 1989) uses meteorological data from these sources in the following way: Aircraft Platform 28A estimated mixing height and overwater dT/dz water temperature, wind speed (18m), air temperature (18m) 10 m Mast σ θ (10m), RH(10m), wind speed (10m), air temperature (10m) Wind speed and temperature measurements at the 10m mast are used only to replace missing values at Platform 28A. No air temperatures were measured at Platform 28A during the July 1981 experiments, so the air temperature measured at the shoreline 10m mast is used for the air-sea temperature difference in July. Geophysical Processing Gridded land use and terrain elevation data for the CALMET geophysical file are obtained from the United States Geological Survey (USGS). The terrain data are from the one-degree 1:250,000-scale DEM dataset, with an approximate resolution of 90m. Land use data are from the 1:250,000-scale Composite Grid Theme (CTG) dataset, with a resolution of 200m. Because the spatial variation in land use is the primary geophysical property for this application, a modeling grid is chosen that places each land use datapoint in the center of a model grid cell. The modeling grid chosen to cover the area is defined by: Map Projection: UTM (Zone 15N) Datum: NAS-C (North American 1927) SW Corner Coordinates (km): (464.9,3285.7) Number of cells (nx,ny): (135,65) Cell Size (km): 0.200 Final Report Vol.1 26
The CALMET preprocessors TERREL, CTGPROC, and MAKEGEO are applied to convert the geophysical datasets to this modeling grid, creating the CALMET GEO.DAT file. Coordinate transformations are applied to the source and receptor locations listed in the OCD4 model runs in order to register these features to land use and terrain data in the GEO.DAT file. The OCD4 dataset references all of these locations to Platform 28A, which is located at approximately (29˚43' N and 93˚14' W). This location is transformed to UTM Zone 15 (NAS-C) and all sampler locations are translated accordingly. The model grid of land use, an aerial photograph of the Louisiana coast in the Cameron area in the same map projection and datum, the coastline data points contained in the World Vector Shoreline dataset, and the release and sampler positions are plotted and compared to the map of sampler positions to refine the coordinate transformations needed to place the samplers along the coast. This process places Platform 28A at (477.850, 3287.225) in UTM zone 15 (NAS-C). A difference in the shape of the coastline from that shown on the experiment layout diagram requires an additional nonlinear adjustment of the samplers in the northsouth direction of 330m or less in the center of the arc. The resulting map of the experiment region is shown in Figure 4-1. The moist character of much of this region is reflected in the “wetland” classification that is assigned to over half of the land area in the grid. The sampler locations follow the coastline well, both as resolved by the gridded land use and as contained in the World Vector Shoreline dataset. Source & Receptor Characterization Three source locations are used in this experiment. These are characterized as modeled in the OCD4 evaluation. Platform 28A is modeled without downwash due to the lack of significant structures on the platform. The boat releases are modeled with downwash, using the boat dimensions as a solid building with the length perpendicular to the wind. A minimal exit velocity is used to remove any momentum rise. Table 4-1 Source Characterization for Cameron, LA Tracer Releases Source X* (km) Y* (km) Ht. (m) Elev. (m) Diam. (m) W (m/s) T (ºK) Hb (m) Lb (m) Platform 28A 477.85 3287.225 13.0 0.0 .2 0.01 270.0 0.0 0.0 Boat 2/15/1982 482.557 3290.166 13.0 0.0 .2 0.01 270.0 7.0 20.0 Boat 2/24/1982 482.524 3289.505 13.0 0.0 .2 0.01 270.0 7.0 20.0 * Locations are in the UTM (Zone 15N) map projection with datum NAS-C Final Report Vol.1 27
Page 1 and 2: Development of the Next Generation
Page 3 and 4: 1. INTRODUCTION The purpose of this
Page 5 and 6: • Prognostic Meteorological Model
Page 7 and 8: o 1: Maul (1980)-Carson (1973) o 2:
Page 9 and 10: into 50 tiles (90 RUC grid-points/t
Page 11 and 12: y H ( 1− 34.15z / L) 1/ 3 = (3-9)
Page 13 and 14: During execution, the bulk algorith
Page 15 and 16: Anemometer Height Adjustment for La
Page 17 and 18: T (ºK) g (m/s 2 ) temperature grav
Page 19 and 20: adjusted to account for the effect
Page 21 and 22: Two methods of supplying the timesc
Page 23 and 24: cell is the cell that determines th
Page 25 and 26: June 4 (1130-1230 CET) L. Turbulenc
Page 27: 4. MODEL PERFORMANCE EVALUATION 4.1
Page 31 and 32: All sampler locations are used as r
Page 33 and 34: Table 4-2b Over-water Meteorologica
Page 35 and 36: Meteorological data used in the OCD
Page 37 and 38: . . CARPINTERIA, CA 3814 . UTM Nort
Page 39 and 40: Year Month Day Table 4-4 Over-water
Page 41 and 42: Datum: NAS-C (North American 1927)
Page 43 and 44: Table 4-5 Source Characterization f
Page 45 and 46: Table 4-6a Over-water Meteorologica
Page 47 and 48: Geophysical Processing Gridded land
Page 49 and 50: Table 4-7 Source Characterization f
Page 51 and 52: tape format called GF-3. These data
Page 53 and 54: . . Strait of Oresund 6230 6220 UTM
Page 55 and 56: . . Strait of Oresund 6230 6220 UTM
Page 57 and 58: Table 4-10 SEA.DAT Meteorological D
Page 59 and 60: the numbers refer to ICOARE values,
Page 61 and 62: that are simulated during the one-h
Page 63 and 64: 4.3 Evaluation Results Cameron, Car
Page 65 and 66: improve model performance relative
Page 67 and 68: Figure 4-7. Graphical depiction of
Page 75 and 76: Table 4-15 Performance Statistics f
Page 77 and 78: Performance of CALPUFF Configuratio
Page 79 and 80:
Table 4-16 Performance Statistics f
Page 81 and 82:
Table 4-16 (continued) Performance
Page 83 and 84:
Figure 4-12. Graphical depiction of
Page 85 and 86:
into CALPUFF, and the simulations a
Page 87 and 88:
Table 4-18 Oresund Results with Min
Page 89 and 90:
Table 4-20 Oresund Results with Min
Page 91 and 92:
Table 4-21 Performance Statistics f
Page 93 and 94:
4.4 Recommendations A minimum σ v
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SEA.DAT and OZONE.DAT files are pro
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36 34 32 30 Latitude 28 26 24 22 -1
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WMO Number WBAN Number Station Iden
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36 72363 72340 34 72249 72248 72235
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36 34 32 41008 30 42035 42007 42040
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36 34 32 30 Latitude 28 26 24 22 -1
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COOP State Station Name Table 5-4.
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COOP State Station Name Table 5-4.
Page 115 and 116:
Table 5-4. (Concluded) Hourly NWS P
Page 117 and 118:
Table 5-5. Ozone Stations Station I
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Table 5-5. (Continued) Ozone Statio
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Table 5-5. (Continued) Ozone Statio
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36 317 339 361 383 405 427 449 471
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- Figure 5-8. “Inputs/Outputs & R
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6. REFERENCES Batchvarova, E. and S
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Maat, N., C. Kraan, and W.A. Oost,
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APPENDIX: COMPILATION OF A HIGH RES
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Volume 1 - The Atmospheric Studies Group at TRC

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