The URBANOPT keyword on the CO pathway in AERMOD (EPA, 2004b) includes an optional

parameter to specify the urban surface roughness length. The urban surface roughness parameter

is used to define a reference height for purposes of adjusting dispersion for surface and low-level

releases to account for the enhanced turbulence associated with the nighttime urban heat island.

This optional urban roughness length is not used to adjust for differences in roughness length

between the meteorological measurement site, used in processing the meteorological data, and

the urban application site. Details regarding the adjustments in AERMOD for the urban

boundary layer, including the use of the urban roughness length parameter, are provided in

Section 5. 8 of the AERMOD model formulation document (Cimorelli, et al., 2004).



n201 - n202 - n203 - n204 - n205 - n206 - n207 - n208 - n209 - n210 - n211 - n212 - n213 - n214 - n215 - n216 - n217 - n218 - n219 - n220 - n221 - n222 - n223 - n224 - n225 - n226 - n227 - n228 - n229 - n230 - n231 - n232 - n233 - n234 - n235 - n236 - n237 - n238 - n239 - n240 - n241 - n242 - n243 - n244 - n245 - n246 - n247 - n248 - n249 - n250


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