1) all levels,

2) mandatory and significant levels, or

3) mandatory levels only.

Options 1 and 2 are both acceptable and should provide equivalent results when processed

through AERMET. The use of mandatory levels only, Option 3, will not provide an adequate

characterization of the potential temperature profile, and is not acceptable for AERMOD

modeling applications.

3.3 PROCESSING SITE-SPECIFIC METEOROLOGICAL DATA FOR URBAN

APPLICATIONS (01/09/08)

The use of site-specific meteorological data obtained from an urban setting may require some

special processing if the measurement site is located within the influence of the urban heat island

and site-specific turbulence measurements are available (e.g., σθ and/or σw). As discussed in

Section 5.4, the urban algorithms in AERMOD are designed to enhance the turbulence levels

relative to the nearby rural setting during nighttime stable conditions to account for the urban

heat island effect. Since the site-specific turbulence measurements will reflect the enhanced

turbulence associated with the heat island, site-specific turbulence measurements should not be

used when applying AERMOD’s urban option, in order to avoid double counting the effects of

enhanced turbulence due to the urban heat island.

 

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