MODTRAN%20Card%20deck/Tape5_Edit%20Tutorial%20Explanation%20of%20Parameters%20

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MODTRAN Card deck/Tape5_Edit TutorialExplanation
of Parameters Options
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Card 1
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Run capabilities MODTRAN MODTRAN Correlated
absorption coefficients (k) This option is most
accurate but runs slow Lowtran (for historical
comparison only)
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Run time parameter used with the correlated K
option Slow used when using 33 k values per
spectral bin and only for upper atmosphere
(gt40km) cooling rates and weighting function
calculations Medium for 17 k values
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Meteorological Data Single-altitude
meteorological data specified (cnst press,
horizontal path only) Tropical Atm 15o N
Latitude Mid-Latitude Summer/Winter 45o N
Latitude (we usually use summer) Sub-Artic
Summer/Winter 60o N Latitude 1976 US Standard
Atm User-specified Model Atm (e.g. radiosonde
data) is to be read in
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Atm Line of Sight (LOS) path Horizontal
(cnst-pressure) path single layer, no
refraction Vertical or slant path between 2
altitudes Vertical or slant path to space or
ground
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Mode of Execution of the Program Transmissive
mode Spectral thermal radiance (no sun/moon)
mode Spectral thermal radiance plus solar/lunar
radiance mode (if IMULT 0 only single
scatter solar radiance is included) Directly
transmitted spectral solar/lunar irradiance
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Multiple Scattering Mode With or Without
Multiple Scattering option
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M1-6 are used to modify or supplement
user-specified altitude profiles for
temperature, pressure, and default molecular
gases as shown
water ozone methane N20 carbon monoxide oxygen
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MDEF is used to modify or supplement
user-specified altitude profiles for
temperature, pressure, and molecular gases such
as NO, SO2, NO2, ammonia, HNO3, 13 heavy
molecules 9 CFCs CIONO2, HNO4, CCL4, and
N2O5
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Input Atmospheric Model Normal Operation
sequentially reuses the previously used
atmospheric model for a series of cases For the
first run or to run MODTRAN once user input data
needs to be read in
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Tape 6 (the output file) Control Normal output
operation Minimize printing of transmittance or
radiance tables and atmospheric
profiles Creates an additional output file
(tape 8) which includes weighting functions in
transmission mode or fluxes in radiation modes
with multiple scattering on
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Boundary Temperature K when greater than zero
In radiation mode at H2 for slants that
intersect the earth or terminate at a grey
boundary (cloud, target, etc.) If apparent
area temperature (AATemp in Card 4) isnt
specified LOS intersects the earth this is
also the lower boundary temperature in
multiple scattering models
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Boundary Temperature K when ? 0 or Blank or
Default No surface emission if H2 is above
ground If the path intersects the earth the
first atmospheric level is used as the
boundary temperature If AATemp is not entered
and the LOS intersects the earth the temperature
of the first atmospheric level the is also
used as the lower bound for the multiple
scattering model
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Surface Albedo one minus the surface
emissivity and spectrally independent constant.
The value can only be between 0 1. If the
parameter is set to something greater than one it
will default to one if the value is left blank it
will default to zero.
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Surface Albedo negative numbers will
correspond to pre-sorted spectrally variable
surface albedos from a spectral library (some
of these are described in the interface as shown,
while there are still other options)