3 Meteorological Preprocessor (AERMET)

The basic purpose of AERMET is to use meteorological measurements, representative of

the modeling domain, to compute certain boundary layer parameters used to estimate profiles of

wind, turbulence and temperature. These profiles are estimated by the AERMOD interface

which is described in Section 4.

While the structure of AERMET is based upon an existing regulatory model preprocessor,

the Meteorological Processor for Regulatory Models (MPRM) (Irwin et al. 1988) the actual

processing of the meteorological data is similar to that done for the CTDMPLUS (Perry 1992)

and HPDM (Hanna and Paine 1989; Hanna and Chang 1993) models. The growth and structure

of the atmospheric boundary layer is driven by the fluxes of heat and momentum which in turn

depend upon surface effects. The depth of this layer and the dispersion of pollutants within it are

influenced on a local scale by surface characteristics such as surface roughness, reflectivity

(albedo), and the availability of surface moisture. The surface parameters provided by AERMET

are the Monin-Obukhov Length (L), surface friction velocity (u*), surface roughness length (zo),

surface heat flux (H), and the convective scaling velocity (w*). AERMET also provides

estimates of the convective and mechanical mixed layer heights, zic and zim, respectively.

AERMET defines the stability of the PBL by the sign of H (convective for H > 0 and stable for

H < 0 ). Although AERMOD is capable of estimating meteorological profiles with data from as

little as one measurement height, it will use as much data as the user can provide for defining the

vertical structure of the boundary layer. In addition to PBL parameters, AERMET passes all

measurements of wind, temperature, and turbulence in a form AERMOD needs.




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