solar elevation angle


fraction of plume mass below Hc (dimensionless)

Qdj total height of the direct source plume (i.e. release height + buoyancy +

convection) (m)

Qrj total height of the indirect source plume (m)

Rm similarity function for momentum (stability correction) - eq. (7) for the

CBL and eq. (29) for the SBL (dimensionless)

7 APPENDIX: Input / Output Needs and Data Usage

7.1 AERMET Input Data Needs

Besides defining surface characteristics, the user provides several files of hourly

meteorological data for processing by AERMET. At the present time AERMET is designed to

accept data from any for the following sources: 1) standard hourly National Weather Service

(NWS) data from the most representative site; 2) morning soundings of winds, temperature, and

dew point from the nearest NWS upper air station; and 3) on-site wind, temperature, turbulence,

pressure, and radiation measurements (if available).

The minimum measured and/or derived data needed to run the AERMOD modeling system

are as follows:


wind speed (u); wind direction; cloud cover - opaque first then total (n); ambient temperature

(t); morning sounding

Cloud cover is also used in dry deposition calculations in the AERMOD model. Therefore, if

cloud cover is missing and the Bulk Richardson Number Scheme is being used (see 3.3.1) then an

equivalent could cover is calculated as follows, based on van Ulden and Holtslag (van Ulden and

Holtslag 1985):



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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