Changes between Version 5 and Version 6 of 2010WP/2010Action_institutions_NOCS

Timestamp:

2009-11-25T15:31:02+01:00 (14 years ago)

Author:

gm

Comment:

--

2010WP/2010Action_institutions_NOCS

@@ -66 +66 @@
    '''Motivation:'''  Griffies's implementation of the Gent and  McWilliams eddy transport as a skew flux is being implemented. This has the advantage that  its numerical discretization can be written in terms of contributions  from quarter cells – ‘triads’. This gives a tighter stencil,  disallowing 2-gridpoint numerical noise that is permitted by the  advective discretization. [[BR]]
    '''Status: ''' A working prototype code for the iso-neutral and skew-flux operator was carefully reviewed in 2009. Considerable care has been taken in the formulation to ensure the tensorial representation is consistent with the variable volume layers (s-coordinate/z* representation). This has been documented and will be provided with the release.   [[BR]]
-     '''Main task:'''  (4 wk) [[BR]]
+   '''Main task:'''  (4 wk) [[BR]]
    (1) Discretise Isopycnal diffusion in terms of these triads. This will obviate the need to smooth  isopycnal slopes horizontally with a Shapiro filter (as currently  implemented in NEMO), or to apply a background horizontal diffusivity  that mixes diapycnally (done). [[BR]]
    (2) Implement Visbeck et al.'s formulation of spatially varying  diffusivities as an alternative to the current formulation based on the Held and Larichev timescale and the Rossby radius as a  lengthscale (done). [[BR]]