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CIRC:
Continual
Intercomparison
of Radiation Codes
How and what to submit:
Please e-mail your submissions to Lazaros
Oreopoulos
and provide, if applicable, a reference or
short description
of your model. Please create two
files for each case (one for SW and one
for LW). Each file should
be given a filename clearly indicating the
case number (it is best to
follow the CIRC name convention with your
institution name in place of lblrtm or charts)
and
should
contain
the broadband irradiances in (Wm-2) at the
atmospheric column boundary,
again clearly identified (for SW we
request downwelling flux at the
surface, total and direct, upwelling flux
at the surface, and
upwelling
flux at TOA; for LW we request downwelling
flux at the surface and
upwelling flux at TOA), followed by
heating rate profiles (in K/day)
resolved at the same vertical resolution
as the provided atmospheric
profiles and following the convention in
the LW_lblrtm_bb_caseX.txt
reference files. If possible, please
provide the true direct flux at
the surface, i.e., without contributions
of scattered radiation along
the direction of the solar beam; if this
is not possible please
elaborate how you partition total
radiation into direct and diffuse. Please
do
not send
any spectral results,
only broadband flux and heating rate
output (both SW and LW) from your
models is
requested.
Optional
submissions:
In order to run the CIRC cases we
provide
input formation that
is
typically not available in within an
operational GCM environment, for
example, spectral surface albedo. It is also
possible, on the other
side, that we may also not be providing
input
information that some models use,
e.g., a cloud inhomogeneity
scaling
factor, or separate albedos for the ground
and an overlying vegetation
canopy. While we would like the submissions
to primarily come from runs
where the model uses as much of the
information we provide as possible,
something that may require small
modifications to the RT algorithms
that change
operational settings, we would also like
to receive submissions where
the algorithms operate with assumptions
and input that more closely
resemble routine operational conditions.
For example, you may choose to
use an
incident solar irradiance that corresponds
to the total solar
irradiance value of your host GCM instead
of the value we provide; or
you may choose not to deactivate any
parameterizations of LW scattering
even though there is no scattering in the
reference calculations.
Please identify these optional submissions
as such, and provide as much
information as possible about differences
with your primary
submissions. The guidelines above on what
to include in each submission
file still apply.
Questions?
For
questions on submitting the results of
your runs please contact Lazaros
Oreopoulos.
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