Generic Guidance and Optimum Model Settings for the CALPUFF ...

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As part of the model enhancement program, changes were made to both CALMET and CALPUFF based on the literature review. One of these changes was to include the COARE (Coupled Ocean Atmosphere Response Experiment) overwater flux model. It was found that the original mixing height algorithm in the CALMET model, which consisted of only mechanicallyderived mixing over water surfaces, sometimes underestimated the mixing heights in the Gulf of Mexico, especially during light wind conditions over warm water. As a result, convective overwater boundary layer heights are now computed under conditions of positive surface heat flux over water. The mixing height over water is now taken as the maximum of the mechanical and convective mixing heights, as CALMET has always done over land surfaces. Thus in addition to the existing convective mixing height scheme, based on Maul (1980) and Carson (1973), an option for a new land and water parameterization (Batchvarova and Gryning, 1991, 1994) has been incorporated into CALMET. Another change included the explicit adjustment of observed buoy winds to 10m and the application of consistent similarity profile equations used throughout the system. Model evaluation tests were conducted using five experiments: (1) Cameron, Louisiana – an experiment conducted along the coast of Gulf of Mexico, (2) a tracer study in Carpinteria area along California coast, (3) a tracer dispersion study at Pismo Beach, California, (4) a tracer study in the Ventura area along the CA coast and, (5) the tracer dispersion study over the strait of Oresund, between the coasts of Denmark and Sweden. The results of the model evaluations indicate that the COARE overwater flux module improves the modeling results over the previous OCD-based model and it should be used as the default in the CALPUFF model. The standard COARE option (no shallow water adjustment or wave model option) appears suitable to these coastal datasets, and there is little performance sensitivity among the COARE options. The Batchvarova-Gryning convective mixing height option in CALMET shows improved performance over the Maul-Carson option. Turbulence advection is an important modeling option to use in coastal applications with the CALMET/CALPUFF system. Table A-3 gives the recommended switches for the Overwater Surface Fluxes. 14
Table 2-3. Tabulated List of Various Methods for Including Meteorological Data into CALMET. The list is detailed in order of decreasing preference. Run Type Description of Run Type NOOBS Partial NOOBS Prognostic model data 3D.DAT file to drive CALMET. No surface or upper air observations at all. Prognostic model data 3D.DAT to drive CALMET + one or more surface stations and optional overwater. Ease of Use and Representativeness Simple to use Very representative Less Simple to use due to: - data preparation, 7 sitespecific choices to be made, difficulty in dealing with missing data, disagreement between 3D.DAT file and Surface observations. Very representative and considered ‘refined modelling’ Data availability Advantages Disadvantages MM5 TRC (www.src.com) 2006, 2007 and 2008 MM5 data as 3D.DAT files at 12km resolution for entire Eastern Australia. TAPM – (CSIRO DAR – Melbourne) (requires full nested simulation by the user) and CALTAPM to transform data to 3D.DAT format. Same as above + any number of surface stations both on and off the model domain 15 � Simple � full spatial and temporal variability � no overwater data required � cloud cover has spatial distribution � eliminates need for complicated 7 user-input site-specific variables � ideal as screening run as gives very good estimate of refined run � very inexpensive � full spatial and temporal variability � no overwater data required � Can either use real observed cloud cover from observation sites or use 3D.DAT spatially distributed cloud cover. � Refined model run as using combined approach of numerical model and observations. � Ability to incorporate surface representative � sometimes resolution of prognostic data is to coarse to be representative of local conditions � In case of TAPM a full nested 3D model simulation is required in order to generate the 3D.DAT file � Surface data, especially winds may be different to that in the 3D.DAT file. � User must include 7 sitespecific variables � Data preparation and missing data
Page 1 and 2: Generic Guidance and Optimum Model
Page 3 and 4: Contents SCOPE OF WORK AND BACKGROU
Page 5 and 6: LIST OF FIGURES Page Figure 2-1. Fi
Page 7 and 8: SCOPE OF WORK AND BACKGROUND A.1 In
Page 9 and 10: 1. INTRODUCTION The CALPUFF modelin
Page 11 and 12: 2.3 Methodologies for Running CALME
Page 13 and 14: hourly profiles of wind speed, wind
Page 15 and 16: Table 2-2. Model Option Switches fo
Page 17 and 18: 2.3.4 Single Station Meteorology It
Page 19: Note that in no-observations (No-Ob
Page 23 and 24: 3 RECOMMENDED MODEL OPTION SETTINGS
Page 25 and 26: Ridge 1 distance (km) Ridge 2 Figur
Page 27 and 28: Boundary Layer (TIBL) over the land
Page 29 and 30: � algorithms were designed to tre
Page 31 and 32: Figure 3-3. Shows a cross-section o
Page 33 and 34: 3.5.2 Evaluation Studies Figure 3-6
Page 35 and 36: AERMOD BLP 60 70 80 90 95 98 99 Cum
Page 37 and 38: In CALPUFF, by default, a calm peri
Page 39 and 40: UTM Y Coordinate (km) - WGS84 6474.
Page 41 and 42: It is important to note that no eva
Page 43 and 44: 6474.5 6474 6473.5 6473 6472.5 6472
Page 45 and 46: sigma v (CALPUFF calculated) Figure
Page 47 and 48: 4. DISCUSSION ON THE APPROPRIATE PR
Page 49 and 50: 4.3.1 Graphical Evaluation Graphica
Page 51 and 52: (uncorrelated). A line of best fit,
Page 53 and 54: 4.3.3 Other Meteorological Evaluati
Page 55 and 56: Schulman, L.L. and J.S. Scire, 1980
Page 57 and 58: Table A-1. An Explanation of the 7
Page 59 and 60: Table A-1 An Explanation of the 7 C
Page 61 and 62: Table A-2 Explanation and Recommend
Page 67 and 68: Table A-4. Explanation and Recommen
Page 69: Table A-4 Explanation and Recommend

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