where 2

* is the temperature scale as calculated from eq. (18).

7.1.2 DIRECTIONALLY AND/OR MONTHLY VARYING SURFACE CHARACTERISTICS

Noon time albedo (rN ); 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. The

information presented in the user’s guide is not be considered regulatory guidance. The user is

encouraged to research the literature to determine the most appropriate values for surface

characteristics, for a specific application.

7.1.3 OTHER

Latitude; longitude; time zone; wind speed instrument threshold for each data set ( uth ).

7.1.4 OPTIONAL

Solar radiation; net radiation (Rn); profile of vertical turbulence (Fw); profile of lateral

turbulence ( F

v)

7.2 Selection and Use of Measured Winds, Temperature and Turbulence in AERMET

7.2.1 THRESHOLD WIND SPEED

The user is required to define a threshold wind speed (uth) for on-site data sets. Although the

current version of AERMOD cannot accept a separate uth for NWS data, a separate uth should be

selected for each on-site data set being used.

7.2.2 REFERENCE TEMPERATURE AND HEIGHT

The reference height for temperature (zTref), and thus the reference temperature, is selected as

the lowest level of data which is available between zo & 100 m.

7.2.3 REFERENCE WIND SPEED AND HEIGHT

The reference height for winds (zref), and thus the reference wind speed (uref), is selected as the

lowest level of data which is available between 7 zo & 100m. Although the current version of

AERMOD cannot accept a separate zref for offsite data, we believe that a separate zref should be

selected for each data set being used.

 

n1001 - n1002 - n1003 - n1004 - n1005 - n1006 - n1007 - n1008 - n1009 - n1010 - n1011 - n1012 - n1013 - n1014 - n1015 - n1016 - n1017 - n1018 - n1019 - n1020 - n1021 - n1022 - n1023 - n1024 - n1025 - n1026 - n1027 - n1028 - n1029 - n1030 - n1031 - n1032 - n1033 - n1034 - n1035 - n1036 - n1037 - n1038 - n1039 - n1040 - n1041 - n1042 - n1043 - n1044 - n1045 - n1046 - n1047 - n1048 - n1049 - n1050

 

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