Some of the basic conventions used in the code have been previously described. We describe a few more of the conventions used in naming variables below:
Generally, variables used to describe
the barotropic mode have ``0'' attached to the end
(e.g. u0
, v0
). Generally, variables used to
describe the baroclinic mode have the suffix
``1'' attached (e.g. u1
, v1
).
rhs
:
The designation ``rhs'' refers to ``right-hand side.''
A variable with this
designation (e.g. rhsu1
, which is the right-hand side of the
differential equation)
as part of its name lumps together all the non-time-dependent
terms of a particular equation.
This makes it easier to increment the system a time step.
im1
and ip1
The variable im1
means ``variable i
minus one.''
The variable ip1
means ``variable i
plus one.''
These are useful for handling the periodic boundary conditions.
Net longwave radiation flux (FLW) into an atmospheric column is defined such that if , then the whole column absorbs energy. Thus:
where ``us'' means upwards, at the surface; ``ds'' means downwards, at the surface; and ``ut'' means upwards, at the top-of-atmosphere.
dayofmodel
variable versus function:
The label dayofmodel
is the name of the variable.
With underscores, i.e. day_of_model
, the term
refers to the function.
Besides the prognostic and diagnostic permanent grid variables, the model also uses some temporary local variables in its computations. Below is an explanation of the names of some of these temporary variables:
u
.
Variable u0atC
represents
`` calculated at a `grid center' position.'' Temperature
(T1
) is located at this location.
Variable u0atC
is computed as the mean
of the two values one half-steps in ``front''
and in ``back'' of the ``grid center.'' Thus,
.
u
.
Variable vatu
represents
``v calculated at the u position,'' and is computed as
the mean
of the meridional velocity v
at the ``four corners''
surrounding the u
point location.
u
.
Variable fu
represents
the Coriolis parameter evaluated at the latitudinal circle
u
is located at.
v
.
Variable fv
represents
the Coriolis parameter evaluated at the latitudinal circle
v
is located at.
Below is a table explaining the meaning of some variables who's function may not be obvious from the variable name and from the conventions described above. These are relatively ``minor'' variables (e.g. not a ``main'' variable like advection) that is specific only to the code, having no direct counterparts in the QTCM1 papers Neelin and Zeng [1] or Zeng et al. [2]. See Section 2.4.2 for a table relating code variables with the notation in the QTCM1 papers.