Generating and Using Meteorological Data in AERMOD

Transcription

1 Generating and Using Meteorological Data in AERMOD June 26, 2012 Prepared by: George J. Schewe, CCM, QEP BREEZE Software Merit Drive Suite 900 Dallas, TX (972) breeze-software.com

2 Meteorology in Transportation ti Hot Spot Modeling AERMOD mentioned in Section 3.6 Focus here on AERMOD input files Section Incorporating Meteorological Data From where do the data come?

3 What is AERMOD? A steady-state plume model that incorporates air dispersion based on planetary boundary layer turbulence structure and scaling concepts, including treatment of both surface and elevated sources, and both simple and complex terrain. Support Center for Regulatory Air Models -

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5 Hot-Spot t Modeling Process 1. Determine need for analysis 2. Determine approach, models, data 3. Estimate on-road motor vehicle emissions 4. Estimate emissions from road dust, construction, other sources 5. Select AQ model, meteorology, roadway configurations, receptors, background concentrations 6. Calculate l design values, compare to NAAQS, and determine conformity 7. Consider mitigation or control measures and repeat

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7 Meteorological Data for AERMOD Finding representative meteorological data NWS, FAA, SCRAM, onsite Surface and upper air data AERSURFACE for albedo, Bowen ratio, surface roughness AERMET preprocessor

8 Selecting Meteorology for Project-Level Hot-Spot Analysis Surface met data NWS, Onsite, other Offsite met data minimum five years Onsite met data minimum one year Upper air met data Surface characteristics, land use Population data used for urban-rural Representative of the project area?

9 Representativeness ti of Meteorology for Hot-Spot Analysis Proximity of project to met data site Similarity of land use and surface characteristics Time period of data Similarity of terrain features Climate similarities

10 Airport vs Site LULC

11 Surface Data National Weather Service Data is typical TD-3505 format (Integrated Hourly Surface Data) obtained from National Climatic Data Center in Asheville or ftp://ftp3.ncdc.noaa.gov/pub/data/noaa Minute data obtained from NOAA at ftp://ftp.ncdc.noaa.gov/pub/data/asos-onemin noaa Verify station location at

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14 Station ti Location

15 Station Location Google Earth Bing

16 Upper Air Data National Weather Service Data is typical FSL Format (Forecast Systems Laboratory) obtained from NOAA online at Verify station location at

17 Upper Air Observation sites

18 Upper Air Station Location Google Earth Bing

19 Land Use From the USGS Seamless Server at Currently only NLCD92 format

20 R i f L d U Review of Land Use Facility Landuse

21 AERSURFACE Output t Season Sect Alb Bo Zo SITE_CHAR SITE_CHAR SITE_CHAR SITE_CHAR SITE_CHAR SITE_CHAR SITE_CHAR SITE_CHAR SITE_CHAR SITE_CHAR SITE_CHAR SITE_CHAR SITE_CHAR SITE_CHAR SITE_CHAR SITE_CHAR SITE_CHAR SITE_CHAR Alb albedo is the amount of solar radiation reflected by the surface Bo Bowen ratio is the ratio of sensible to latent heat Zo surface roughness length is related to the land use which interrupts smooth-flowing winds at the surface

22 AERMET Processing Stage 1 and Raw Sounding File AERMET QA Raw Surface File AERMET QA MERGE Raw Manual/AERMET On-site File QA Stage 3 Surface Upper 1-min data AERMINUTE Explicit Land Use Analysis Bowen ratio, roughness, albedo

23 Features of AERMET Processes one minute and hourly surface observations, twice-daily upper air soundings, and on-site measurements: AERMINUTE processes one minute u and AERMET processes in three stages Stage 1: Extracts/processes data a from AERMINUTE, archived data files and performs quality assessment (QA) Stage 2: Merges all data from Stage 1 and stores these data together in a single file Stage 3: Reads merged meteorological data and estimates boundary layer parameters for use by AERMOD

24 Surface Turbulence Parameters AERMET computes turbulence parameters for use in AERMOD Sensible heat flux Surface friction velocity Convective velocity scale Convective boundary layer height Vertical potential temperature gradient Stable boundary layer height Monin-Obukhov length

25 Processed Met Data Met Data File using PCRAMMET Surface Met Data File using AERMET

26 Questions/Discussion? George J. Schewe, CCM, QEP (859) com