| 34 | | === S1.5-a - Review of new documentation === |
| 35 | | '''Motivation:''' The exchange and proof-reading of new documentation between system team sites before release should ensure consistency of style, readability and accuracy.[[BR]] |
| 36 | | '''Status :''' Carried over from 2009 but expected to start as soon as new documentation is submitted.[[BR]] |
| 37 | | '''Principal Investigator :''' Steven Alderson (sga@noc.soton.ac.uk) [[BR]] |
| 38 | | [[BR]] |
| 39 | | === S3.2-a — Revisit of mass and salt fluxes between ice, ocean and air === |
| 40 | | '''Motivation:''' As a consequence of the embedding of sea-ice into the ocean (see S3.2-b), the total mass of salt of the combined sea-ice/ocean system is |
| 41 | | conserved by removing a volume of water from the ocean when ice forms or adding a volume of water when it melts. When ice forms, salt contained |
| 42 | | in the water is returned to the ocean, less the salt retained in the ice itself. When ice melts, the salt contained is added back to the ocean. (NOCS team, 3wk)[[BR]] |
| 43 | | '''Status :''' Carried over from 2009 but work is well advanced. Full testing and documentation will be complete for 3.3 release [[BR]] |
| 44 | | '''Principal Investigator :''' Yevgeny Aksenov (yka@noc.soton.ac.uk) [[BR]] |
| 45 | | |
| 46 | | === S3.2-b — Embedding sea-ice inside the ocean === |
| 47 | | '''Motivation:''' Replace the unrealistic 'levitating' ice[[BR]] |
| 48 | | '''Main task:''' [[BR]] |
| 49 | | (1) To improve the coupling between the sea-ice and ocean models, we embed the sea-ice into the ocean by changing the volume of |
| 50 | | the ocean and depressing the ocean interface by a depth equal to the mean ice draft. |
| 51 | | The latter is calculated as the water equivalent of the total ice and snow mass in the model grid box using in-situ local densities of seawater. |
| 52 | | The pressure gradient that takes into account the total weight of sea ice and snow in the top model grid box is added to the ocean momentum budget. |
| 53 | | The vertical coordinate is redefined for the whole water column. (v3.3) (NOCS team, 4wk)[[BR]] |
| 54 | | '''Status :''' During 2009 the above scheme was implemented and tested at NOCS in a 100-year long integration of an ORCA2-LIM2 configuration using both |
| 55 | | linear and non-linear free surface options. |
| 56 | | It was also tested for short runs in the ORCA2-LIM3 configurations. |
| 57 | | A longer run in ORCA2-LIM3 will take place early in 2010 and the code committed for the NEMO 3.3 release.[[BR]] |
| 58 | | '''Principal Investigator :''' Yevgeny Aksenov (yka@noc.soton.ac.uk) [[BR]] |
| 59 | | === S3.2-c — Embedding sea-ice inside the ocean for CICE === |
| 60 | | '''Motivation:''' Similar changes will have to be made in order to fully embed CICE-modelled sea-ice. Subtle differences and problems may arise because of the B-grid basis of CICE. This work is listed separately to ensure that possible delays will not impact on the delivery of an embedded solution for LIM (v3.3) (NOCS team, 3wk)[[BR]] |
| 61 | | '''Principal Investigator :''' Yevgeny Aksenov (yka@noc.soton.ac.uk) [[BR]] |
| 62 | | |
| 63 | | === S3.2-d — Lateral ocean physics === |
| 64 | | '''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]] |
| 65 | | '''Main task:''' [[BR]] |
| 66 | | (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. [[BR]] |
| 67 | | (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. [[BR]] |
| 68 | | (3) Add a slope limiting algorithm (mixed-layer depth is sensitive to the slope limiting that is employed) that behaves satisfactorily within and immediately below the mixed layer. (v3.3) (NOCS team, 4wk)[[BR]] |
| 69 | | '''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]] |
| 70 | | '''Principal Investigator :''' George Nurser (agn@noc.soton.ac.uk) [[BR]] |
| 71 | | |
| 72 | | === S3.2-e — Improved thermodynamics for LIM3 === |
| 73 | | '''Motivation:''' Enhancement of lateral melting paramerisations[[BR]] |
| 74 | | '''Main task:''' [[BR]] |
| 75 | | (1) New parameterisations for lateral melting processes will be incorporated including parameterisations for the effects of waves on fragmentation and melting. (NOCS team, 8wk) [[BR]] |
| 76 | | '''Principal Investigator :''' Yevgeny Aksenov (yka@noc.soton.ac.uk) [[BR]] |
| 77 | | |
| 78 | | === S3.2-f — Rationalisation of support for ORCA configurations === |
| 79 | | '''Motivation:''' A cleaning and enhancement of code support for global (ORCA) configurations is required to introduce configurations in common use across the community. [[BR]] |
| 80 | | '''Main task:''' [[BR]] |
| 81 | | (1) Support will be improved or added for ORCA1, ORCA05, ORCA025 and ORCA_R12 configurations in such a way that multiple vertical resolutions of each can be maintained. [[BR]] |
| 82 | | (2) The use of .h90 files will also be suppressed. (NOCS team, 4wk) [[BR]] |
| 83 | | '''Principal Investigator :''' Andrew Coward (acc@noc.soton.ac.uk) [[BR]] |
| 84 | | |
| 85 | | === S3.2-g — Improvement of numerical treatment for vertical diffusion === |
| 86 | | '''Motivation:''' An improvement in the numerical treatment of vertical diffusion can be achieved by replacing the fully implicit scheme with a Crank-Nicholson scheme. This approach is widely used in other ocean models (e.g. ROMS) and can be implemented relatively simply.[[BR]] |
| 87 | | '''Main task:''' [[BR]] |
| 88 | | (1) The replacement scheme will be implemented and its performance tested. [[BR]] |
| 89 | | (2) A similar scheme will also be implemented for the bottom friction contribution to the barotropic momentum trend in dynspg_ts. (NOCS team, 1wk)[[BR]] |
| 90 | | '''Principal Investigator :''' Andrew Coward (acc@noc.soton.ac.uk) [[BR]] |
| 91 | | |
| 92 | | === S3.2-h — Implementation of the Neptune effect parameterisation === |
| 93 | | '''Motivation:''' The Neptune effect (Holloway 1992) is a well established parameterisation of the interaction of eddies with topography. The parameterisation is often seen as essential in Arctic ocean simulations even in high resolution models. [[BR]] |
| 94 | | '''Main task:''' [[BR]] |
| 95 | | (1) Add the parameterisation to the reference code [[BR]] |
| 96 | | (2) Test, document and report (v3.3) (NOCS team, 5wk)[[BR]] |
| 97 | | '''Principal Investigator :''' Jeff Blundell (jeff@noc.soton.ac.uk) [[BR]] |
| 98 | | |
| 99 | | === S3.2-h — Implementation of spectral nudging === |
| 100 | | '''Motivation:''' Work by our Canadian colleagues has demonstrated the potentail benefits of spectral nudging techniques to restore large scale gradients without suppressing meso-scale activity. [[BR]] |
| 101 | | '''Main task'''[[BR]] |
| 102 | | (1) The v2.3 solution will be obtained and implemented in the reference code (v3.3) (NOCS team, 6wk)[[BR]] |
| 103 | | '''Principal Investigator :''' Jeff Blundell (jeff@noc.soton.ac.uk) [[BR]] |
| 104 | | |
| 105 | | |
| 106 | | ---- |
| 107 | | |
| 108 | | == '''S 3.3 : from MERCATOR-NEMO team''' == |
| 109 | | [[BR]] |
| 110 | | === S3.3-a — ECUME bulk formulation === |
| 111 | | '''Motivation:''' ability for NEMO to use another bulk formulation for heat, humidity and momentum at the air/sea interface based on multi-campaigns in situ measurements [[BR]] |
| 112 | | '''Status :''' development and phasing with nemo3.2_beta ok (done in 2009) [[BR]] |
| 113 | | '''main task:''' doc and nvtk will be done (3w) [[BR]] |
| 114 | | '''Principal Investigator :''' Gilles Garric (ggarric@mercator-ocean.fr)[[BR]] |
| 115 | | |
| 116 | | === S3.3-b — Vertical scheme === |
| 117 | | '''Motivation:''' Mellor Yamada 2,5, generic length scale (Umlauf and burchard 2003) +boundary conditions(Craig and Banner) [[BR]] |
| 118 | | '''Status :''' Running on NEMO_2.3; development on NEMO_3.2[[BR]] |
| 119 | | '''main tasks :'''Phasing, nvtk and doc (5w) [[BR]] |
| 120 | | '''Principal Investigator :''' Guillaume Reffray (greffray@mercator-ocean.fr)[[BR]] |
| 121 | | |
| 122 | | === S3.3-c — Lagrangian Floats Module: Validation, Improvements ( IO in Netcdf) === |
| 123 | | '''Motivation:''' Online monitoring of water particles (position + (T,S) signature), improvements of ascii output + implementation of I/O Ariane (B Blanke) convention: on-mesh initialisation+ netcdf outputs [[BR]] |
| 124 | | '''Status :''' OK for NEMO 2.3 [[BR]] |
| 125 | | '''main tasks :''' Phasing, nvtk and doc (3w) [[BR]] |
| 126 | | '''Principal Investigator :''' stephane LAW CHUNE (slaw@mercator-ocean.fr) [[BR]] |
| 127 | | |
| 128 | | === S3.3-d — resolving the 2 versions of time-stepping === |
| 129 | | '''Motivation:''' Tracer conservation and time splitting. reference: Shchepetkin, A. F., and J. C. McWilliams, 2005 [[BR]] |
| 130 | | '''Status :'''NVTK OK. commit early 2010 [[BR]] |
| 131 | | '''main tasks :''' Documentation is missing (2w)[[BR]] |
| 132 | | '''Principal Investigator :''' Jerome Chanut (jchanut@mercator-ocean.fr) [[BR]] |
| 133 | | |
| 134 | | === S3.3-e — Mixed Implicit/Explicit bottom friction === |
| 135 | | '''Motivation:''' Unconsistent bottom stress in 2d and 3d modes. From BOM code. Explicit bottom stress in barotropic equations/implicit in baroclinic equations ....[[BR]] |
| 136 | | '''Status :'''Ready. Need to iterate with Gurvan with respect to recent implementation of explicit bottom friction. comit: Mid 2010 [[BR]] |
| 137 | | '''main tasks :''' phasing, nvtk and doc(3w)[[BR]] |
| 138 | | '''Principal Investigator :''' Jerome Chanut (jchanut@mercator-ocean.fr)[[BR]] |
| 139 | | |
| 140 | | === S3.3-f — Misceallenous: Log bottom friction === |
| 141 | | '''Motivation:'''Add Logarithmic bottom friction for tidal applications [[BR]] |
| 142 | | '''Status :''' Development OK. comit: Mid 2010. [[BR]] |
| 143 | | '''main tasks :''' phasing, nvtk and doc(3w) [[BR]] |
| 144 | | '''Principal Investigator :''' Jerome Chanut (jchanut@mercator-ocean.fr)[[BR]] |
| 145 | | |
| 146 | | === S3.3-g — two bands solar penetration scheme with climatological KPAR attenuationcoefficient. === |
| 147 | | '''Motivation:''' More simple and cheaper than 4 bands attenuation scheme (Rochford et al, JGR 2001. Uses climatological KPAR, 2 bands attenuation.) [[BR]] |
| 148 | | '''Status :'''Development OK. comit: Mid 2010 [[BR]] |
| 149 | | '''main tasks :''' phasing, nvtk and doc(3w) [[BR]] |
| 150 | | '''Principal Investigator :''' Jerome Chanut (jchanut@mercator-ocean.fr)[[BR]] |
| 151 | | |
| 152 | | |
| 153 | | |
| 154 | | ---- |
| 155 | | |
| 156 | | == '''S 3.4 : from Met Office-NEMO team''' == |
| 157 | | [[BR]] |
| 158 | | |
| 159 | | === S3.4-a — Title === |
| 160 | | '''Motivation:''' ....[[BR]] |
| 161 | | '''Status :''' .... [[BR]] |
| 162 | | '''main tasks :''' .... [[BR]] |
| 163 | | (1) ... [[BR]] |
| 164 | | |
| 165 | | (2) ... [[BR]] |
| 166 | | |
| 167 | | '''Principal Investigator :''' name (email adress) [[BR]] |
| 168 | | ... |
| 169 | | |
| 170 | | |
| 171 | | |
