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Met Files |
  
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Met Files |
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The AERMOD model uses hourly meteorological data from separate surface and profile data files as one of the basic model inputs.
Model Keyword: SURFFILE and PROFFILE
Surface file: Click on the Browse button to select a surface meteorological data file for use in the model run.
The surface meteorological data file consists of a header record containing information on the meteorological station locations, and one record for each hour of data. These data are delimited by at least one space between each element, i.e., the data may be read as free format. The contents of the surface file are as follows:
Year
Month (1 - 12)
Day (1 -31)
Julian day (1 - 366)
Hour (1 - 24)
Sensible heat flux (W m-2)
Surface friction velocity, u* (ms-1)
Convective velocity scale, w* (ms-1)
Vertical potential temperature gradient in the 500 m layer above the planetary boundary layer
Height of the convectively-generated boundary layer (m)
Height of the mechanically-generated boundary layer (m)
Monin-Obukhov length, L (m)
Surface roughness length, z0 (m)
Bowen ratio
Albedo
Wind speed (ms-1) used in the computations
Wind direction (degrees) corresponding to the wind speed above
Height at which the wind above was measured (m)
Temperature (K) used in the computations
Height at which the temperature above was measured (m)
The sensible heat flux, Bowen ratio and albedo are not used by the AERMOD model, but are passed through by AERMET for information purposes only.
Profile file: Click on the Browse button to select a profile meteorological data file for use in the model run.
The profile meteorological data file consists of one or more records for each hour of data. As with the surface data file, the data are delimited by at least one space between each element and may be read as Fortran free format. The contents of the profile meteorological data file are as follows:
Year
Month (1 - 12)
Day (1 -31)
Hour (1 - 24)
Measurement height (m)
Top flag = 1, if this is the last (highest) level for this hour, 0, otherwise
Wind direction for the current level (degrees)
Wind speed for the current level (ms-1)
Temperature at the current level (K)
Standard deviation of the wind direction, F2 (degrees)
Standard deviation of the vertical wind speed, Fw (ms-1)
Model Keyword: SURFDATA
Station number: Select this field to enter the surface station ID number (e.g., the WBAN number for NWS stations). This information will be read directly from the meteorological data file if it is available. The AERMOD model compares the station number input with the numbers included in the header record of the surface meteorological data file, and issues non-fatal warning messages if there are any mismatches.
Year: Select this field to enter the year that meteorological data were collected. If the correct file format is selected, this information will be read directly from the meteorological data file (this year applies to the upper air station as well).
Name (optional): You can provide an optional name for the station for informational purposes only.
Elevation: Since potential temperature is dependent on the elevation above mean sea level (MSL) you must enter the base elevation of the surface station in meters. The AERMOD model generates a gridded vertical profile of potential temperatures for use in the plume rise calculations. The base elevation should correspond with the base elevation of the primary meteorological tower. The primary tower is usually considered the on-site tower if onsite data is included in the meteorological data. Model Keyword: PROFBASE
Displays the period of hourly meteorological data contained in the Surface data file. This field is for informational purposes only and can not be edited. The date format is:
YYYY/MM/DD/HH
where:
YYYY = four digit year
MM = two digit month
DD = two digit day
HH = hour
Model Keyword: UAIRDATA
Station number: Select this field to enter the upper station ID number (e.g., the WBAN number for NWS stations). This information will be read directly from the surface meteorological data file if it is available. The AERMOD model compares the station number input with the numbers included in the header record of the surface meteorological data file, and issues non-fatal warning messages if there are any mismatches.
Year: Select this field to enter the year that meteorological data were collected. If the correct file format is selected, this information will be read directly from the surface meteorological data file.
Name (optional): You can provide an optional name for the upper air station for informational purposes only.
On-site station information is for informational purposes only.
Model Keyword: SITEDATA
Station number: Select this field to enter the onsite station ID number. This information needs to be entered in manually as it is not read from the surface meteorological file.
Year: Select this field to enter the year that meteorological data were collected. If the correct file format is selected, this information will be read directly from the surface meteorological data file.
Name (optional): You can provide an optional name for the on-site meteorological station for informational purposes only.
Page url: http://www.breeze-software.com/prod/aermod-isc/help/index.html?me_metfiles.htm