Download 12 Deliverable A05.1

PM3 Deliverable: A05.1
ESS GmbH
internally calculated from the three precipitation water content forms
provided on the cloud/rain file.
6. Vertical Diffusivity File: The Fortran binary vertical diffusivity file
contains three-dimensional gridded fields of layer interface vertical
diffusivity (i.e., turbulent exchange or diffusion coefficients).
7.
CAMx can use the (optional)MM5 meteorological pre-processor to
generate all necessary meteorological input files. If no MM5
meteorological pre-processor output is available, meteorological data
are derived in the following way:
1. Height/Pressure File:
Layer interface heights are fixed at
25 m, 50 m, 100 m, 200 m, 500 m, 1000 m, 2000 m and 4000 m.
Pressure (mb) [time variant 3-dim matrix]
calculated from ground atmosheric pressure and temperature and
elevation
M = 0.028964; [kgmol-1] molweight of air
g = 9.81; [ms-2] acceleration due to gravity
R = 8.314; [JK-1mol-1] Gas Constant
h: height
t[i][j] temperature of grid cell i,j, h=0
pres[i][j] pressure of grid cell i,j, h=0
p[(i,j,h) pressure of grid cell i,j, h
p[(i,j,h) = pres[i][j] * exp((-M*g*h/(R*t[i][j])));
Since most monitoring stations do not contain values for pressure,
pres[i][j] = 1001 mb at h = 0 m is assumed for all i, j of the domain
2. Wind File
The 3D wind dynamic field is calculated using the Diagnostic Wind
Field Model DWM and a synthetic geostrophic wind (assumed to be
homogeneous over the domain) estimated from the (vector average)
of anemometric wind data, using an exponential vertical profile for
speed and a Coriolis induced rotation.
This is based on the DEM ( 1 km resolution) for the domain, and the
anemometric wind speed and wind direction of one or more
monitoring stations the user can select interactively for the meteo
scenarios for scenario analysis (AERMOD and CAMx). The station
selection for nowcast and forecast runs are configurable but not
interactively to better maintain consistency.
3. Temperature File
Temperature [time variant 3-dim matrix] is
calculated from ground temperature [2-dim matrix] and height,
assuming adiabatic lapse rate alr =0.003 K/m
h: height (elevation + layer height)
T(x,y,h)* = T(x,y,h=0) - alr*h
Page 82 of 95