DIRECTIONALLY AND/OR MONTHLY VARYING SURFACE CHARACTERISTICS
Noon time albedo (r ' ); Bowen ratio (Bo ); roughness length (zo ) - For AERMET, the user can specify monthly variations of three surface characteristics for up to 12 upwind direction sectors. These include: the albedo (r), which is the fraction of radiation reflected by the surface; the Bowen ratio (Bo), which is the ratio of the sensible heat flux to the evaporation heat flux; and the surface roughness length (zo) , which is the height above the ground at which the horizontal wind velocity is typically zero. The user will be guided by look-up tables (in the AERMET user's guide) of typical values for these three variables for a variety of seasons and land use types.
8 APPENDIX: Input / Output Needs and Data Usage
8.1
AERMET Input Data Needs
8.1.1
METEOROLOGY
8.1.2
DIRECTIONALLY AND/OR MONTHLY VARYING SURFACE
CHARACTERISTICS
8.1.3
OTHER
8.1.4
OPTIONAL
8.2
Estimation of solar insolation for small solar elevation angles
8.3
Selection and Use of Measured Winds,
Temperature and Turbulence in AERMET
8.3.1
THRESHOLD WIND SPEED
8.3.2
REFERENCE TEMPERATURE AND HEIGHT
8.3.3
REFERENCE WIND SPEED AND HEIGHT
8.3.4
CALCULATING THE POTENTIAL TEMPERATURE GRADIENT
ABOVE THE
MIXING HEIGHT FROM SOUNDING DATA
8.3.5
MEASURED TURBULENCE
8.3.6
DATA SUBSTITUTION FOR MISSING ON-SITE DATA
8.4
Information Passed by AERMET to AERMOD
8.5
Restrictions on the Growth of PBL Height
8.6
Initializing the Mechanical Mixing Height Smoothing Procedure
8.7
Determining The Mixing Height When the Sounding Is Too Shallow
8.8
Input Data Needs for AERMAP
8.9
Information Passed by AERMAP to AERMOD
8.10
Wind Speed & Turbulence Limits Used in Model Calculations
8.11
Using Profiles for Interpolating Between Observations
8.12
Using Measured Mixing Heights
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