The dependence of meteorological measurements and plume dispersion on Bowen ratio and
albedo is very different than the dependence on surface roughness. Effective values for Bowen
ratio and albedo are used to estimate the strength of convective turbulence during unstable
conditions by determining how much of the incoming radiation is converted to sensible heat flux.
These estimates of convective turbulence are not linked as directly with tower measurements as
the linkage between the measured wind speed and the estimation of mechanical turbulence
intensities driven by surface roughness elements. While local surface characteristics
immediately upwind of the measurement site are very important for surface roughness, effective
values of Bowen ratio and albedo determined over a larger domain are more appropriate.
The recommended approach for processing digitized land cover data to determine the effective
Bowen ratio and albedo for input to AERMET is to average the surface characteristics across a
representative domain without any direction or distance dependency. The recommended default
domain is a 10km by 10km region centered on the measurement site. Use of the measurement
location to define the domain is likely to be adequate for most applications. However, a domain
representative of the application site may be more appropriate for some applications, particularly
if the majority of sources are elevated releases. The use of an alternative domain for Bowen
ratio and albedo should be documented and justified in a modeling protocol submitted to the
appropriate reviewing authority prior to conducting the modeling analysis.
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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
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