air quality assessment & management
Reference and User Manual
Roughness LengthLand use surface characteristics and associated roughness (length) as well as UV albedo are important inputs for CAMx.
CAMx landuse categories and the default surface roughness values (m) assigned to each category by season. Winter is defined for conditions where there is snow present; winter months with no snow are assigned to the Fall category. Roughness for water is taken as the maximum of the baseline value given in the table, and the function Z0 = 0.000002 w**2.5 , where w is surface wind speed (m/s).
The listed UV albedo values can be used to assign UV albedo from landuse data in preparing the albedo/haze/ozone (AHO) input file.
Surface Roughness (in meters) and UV Albedo by land cover and season