Version release-3.6

Released 5 years ago (2015-06-30T19:17:39+02:00)

Main new features

  • Coupled interface for next IPCC requirements (multi category sea-ice, calving and iceberg module)
  • Runoff improved and SBC with BGC
  • Solar flux filtering at daily frequency to force BGC component
  • Major evolution of LIM sea-ice model (including LIM3 in mono category, i.e. similar to LIM2)
  • On line coarsening of ocean I/O
  • Ocean and ice allowed to be explicitly coupled through OASIS, using StandAlone Surface module)
  • First steps of wave coupling
  • MPI optimisation
  • XIOS new IO system
  • Standard Fox Kemper parametrisation
  • Atmospheric forcing at land-ocean interface
  • Open boundaries: completion of BDY/OBC merge
  • Solved 2 time stepping issues
  • Faster split-explicit time stepping, Z-tilde ALE coordinates, implicit bottom friction
  • First version of Configuration Manager
  • Standalone OBS component and improvements in OBS & ASM

Features becoming obsolete

  • LIM2 (replaced by LIM3 monocategory)

List of associated branches

Includes all the developments of 3_5 (especially the new XIOS IO system) , and new features:

  • Open boundaries: completion of BDY/OBC merge
  • Solved 2 time stepping issues
  • Faster split-explicit time stepping, Z-tilde ALE coordinates, implicit bottom friction
  • First version of Configuration Manager
  • Major evolution of LIM sea-ice model (including towards LIM2/LIM3 merge)
  • Standalone OBS component and improvements in OBS&ASM
  • Coupled interface for next IPCC requirements (multi category sea-ice, calving and iceberg module)
  • Runoff improved and SBC with BGC
  • MPP assessment and optimisation
  • Standard Fox Kemper parametrisation
  • First steps of wave coupling
  • On line coarsening of ocean I/O
  • Solar flux filtering at daily frequency to force BGC component
  • Atmospheric forcing at land-ocean interface

Brief overview of the v3_5_alpha majors improvements and developments

The new Input/Output server XIOS is a major evolution including a versatile xml interface, the dedicated processors for I/O functionality allowing improved scalability, and a large performance improvement on massively parallel platforms.
This option is now set as the default one. The previous IOIPSL code and interface are kept as backup options at this stage.

Interfaces

  • Ocean/ice/biogeochemistry/atmosphere: revisit heat/salt(tracers)/mass fluxes ; new levitating & embedded sea-ice (for LIM & CICE)
  • AGRIF is now sea-ice (LIM) compatible using a new AGRIF package shared with other GCMs
  • Compilation with external biogeochemistry model
  • Improved CICE-NEMO interface
  • ICB module (Bigg et al 1997, Martin and Adcroft 2010): icebergs as lagrangian floats (~200,000!) allowing improved fresh water input especially in the Southern ocean
  • SAS: Stand Alone Surface module allowing testing of forcing set with bulk formulae, to run sea-ice models without ocean, to run ICB icebergs module alone, and to test AGRIF with sea-ice
  • Biogeochemical component NEMO-TOP: PISCES will now include the LOBSTER functionalities, becoming more general and allowing a simplification and reduction of code size
  • Open boundaries module: merging the two existing options (OBC and BDY) has made some important progress (end of the work expected for 2013)
  • Wave-NEMO interface module has been further developed with the introduction of the reading of the 2D stoke drift and wave number and the on-line computation of the 3D stoke drift current.

Misc.

  • A new vertical sigma coordinate stretching function (Siddorn and Furner OM 2012r)
  • Smagorinsky eddy coefficients: Smagorinsky type diffusivity/viscosity for lateral mixing has been introduced
  • Analytical tropical cyclones taken in account using track and magnitude observations (Vincent et al. JGR 2012a,b)
  • MUSCL: an option for local up-stream advection schemes which are useful in case of rivers, straits and in proximity of open lateral boundary conditions. The possibility to switch from MUSCL to a standard up-stream scheme has been included in the MUSCL advection routine
  • NEMO-OBS: observation operators. Add a model equivalent of SST at night
  • Log layer for bottom friction is now added (sigma coordinates only)
  • Evolution of SETTE validation tool

Milestones

Milestone: 2015 release-3.6

Completed 2 years ago (2017-12-19T16:46:52+01:00)

The next stable release of NEMO reference will be the 3_6_STABLE including all recent developments fully validated for CMIP6.

wiki:2015WP

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Closed tickets

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Milestone: 2014 WP postponed

Completed 2 years ago (2017-09-29T17:39:01+02:00)

Some of the developments done in 2014 have not been merged into the NEMO reference at the end of the year in order to focus on 3_6_STABLE for CMIP6 during first months of 2015. Those pending developments will be included in the reference in November 2015 during Merge party. Those pending developments thus need to be updated on the NEMO trunk after the simplification process (seem 2015 simplification milestone)

wiki:2014WP

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No tickets found

Closed tickets

#1441
BDY open boundaries for biogeochemistry (CMCC-5)
#1448
Scalability with MPI-OPENMP (CMCC-1)
#1449
Performance analysis of parallel IO (CMCC-2)
#1452
2015: AGRIF-3 /MERCATOR-4 AGRIF + time-splitting compatibility (ctnd)
#1544
Wave-current: Tracer advection & surface stress

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