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Use directly gradient of PhiSurf as argument (instead of grad.eta)
remove "include CG2D.h"
implement a Crank-Nickelson barotropic time-stepping
Made sure each .F and .h file had the CVS keywords Header and Name at its start. Most had header but very few currently have Name, so lots of changes!
Merged changes from branch "branch-atmos-merge" into MAIN (checkpoint34) - substantial modifications to algorithm sequence (dynamics.F) - packaged OBCS, Shapiro filter, Zonal filter, Atmospheric Physics
Cosmetic.
Modifications for non-hydrostatic ability + updates for open-boundaries.
Changes to allow for atmospheric integration builds of the code
Isomorphism consistency changes
Isomorphism consistency changes
Changes for consistent pressure | height isomorphism
Various changes including time-dependant forcing: o logic for controlling external forcing fields now allows for time-dependant forcing: load_external_fields.F o genmake.dec needed a special line for the above file. o theta* and salt* time-stepping algorithm were re-implemented. The 4x4 global configuration has been "double-checked" against CNH's version. However, we do not assume any responsibility for the correctness of this code ... 8-)
Tidied up some stray AB-II variables that are no longer used.
E-implemented the theta* and salt* time-stepping scheme. We did this so that theta/salt/u/v would all be at the same time-level at the end of dynamics() to make I/O easier.
Changes to support topography, hydrography and forcing from files
Implemented implicit vertical diffusion (tracers only). Involved introducing a "total" diffusivity array (local 3D) calculated by calc_diffusivity(). Made some small changes to time-stepping algorithm. Switched on by setting implicitZdiffusion. (note: *Not* fully tested with topography. But when switched off this does produce identical results)
Swapped the time-stepping algorithm around (just a little bit). We now officially use the predictor-corrector terminology. We make the prediction step at the end of the dynamics() section and store the result in the gUNm1, gVNm1, gTNm1 arrays. The "tricky" part is that at the beginning of the dynamics section, where the "correction" is made, theses arrays must be initialised at the beginning of any run. A new routine init_predictor() does this. This is "all" in preparation for implicit diffusion. Let's hope it's enough...
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