can be obtained from the Radiosonde Data of North A1 merica CD for the period 1946-1997.
2Upper air soundings for 1994 through the present are also available for free download from the
3Radiosonde Database Access website. Users should choose all levels or mandatory and
4significant pressure levels29 when selecting upper air data. Selecting mandatory levels only
5would not be adequate for input into AERMET as the use of just mandatory levels would not
6provide an adequate characterization of the potential temperature profile.
84. Running AERMOD and implications for design value calculations
10Recent enhancements to AERMOD include options to aid in the calculation of design
11values for comparison with the PM2.5 NAAQS and to aid in determining whether emissions from
12the project source contributed significantly to any modeled violations. These enhancements
14• The MAXDCONT option, which shows the contribution of each user-specified source
15group to the high ranked values for a specified target source group paired in time and
16space. The user can specify a range of ranks to analyze or specify an upper bound rank,
17i.e. 8th highest, corresponding to the 98th percentile for the 24-hour PM2.5 NAAQS, and a
18lower threshold concentration value, such as the NAAQS for the target source group.
19The model will process each rank within the range specified, but will stop after the first
20rank (in descending order of concentration) that is below the threshold value if specified
21by the user. A warning message will be generated if the threshold is not reached within
22the range of ranks analyzed (based on the range of ranks specified on the RECTABLE
23keyword). This option may be needed to aid in determining which sources should be
24considered for controls.
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castellano: DISPER CUSTIC DESCAR RADIA italiano:
deutsch: DIS CUS DES RAD
castellano: DIS CUS DES RAD english: DIS CUS DES RAD
português: DIS CUS DES RAD italiano: DIS CUS DES RAD
français: DIS CUS DES RAD