Version 31 (modified by acc, 10 years ago) (diff)

2010: from merge party to 3_3 release

Last edited Timestamp?

This page is intended to facilitate the work of the next few weeks, i.e. beween the merge party and the release of 3_3. Feel free to edit it to add your information, comments, suggestions….

19 october 2010: branch nemo_v3_3_beta created

After the merge party, the branch with all developments from the year has been built:
This beta version is available using :
svn co (read only)
svn+ssh://"your_login" (read/write).

List of tests done and results:

Add here test description (Branch nemo_v3_3_beta, Revision2298 (now) , configuration, computer, restartability, …)

DescriptionRevision noConfigurationComputerPerf. memoryPerf. CPURestartabilityOthers

List of problems, solutions…

Before releasing it to developer's for beta testing, the following weaknesses should be solved: (please update the information)

DateRevision noProblem descriptionTo be solved by:StateDateVersion
with AGRIFLOCEAN and LJKCompilation now OK but not execution
new EVP rheology got lost during the mergeMERCATOR & LOCEANroutines and namelist commited, some tests still ongoing??27 Oct 20102320
Atmospheric pressureMERCATOR & LOCEAN
Suppress TKE old optionLOCEANdone, ticket #74222 Oct 2010
add LibIGCM as externalLOCEANtbd
choose between key_mpp_rep1 and key_mpp_rep2, rename it key_mpp_rep and clean the codeLOCEANdone, ticket #74322 Oct 2010
add surface pressure forcingMERCATORtbd
correct input files, in ORCA2_LIM tar file, suppress duplicated files, rename chlorophyll file to be consistent with the namelist, add a sample of observation fileLOCEANtbd
bottom condition for GLS should be checkedMERCATORdone20 Oct 2010rev 2309 in zdfbfr.F90
execution fails after 2 time step using time splitting and VVLUKMO and LOCEANmodifications sent by LOCEAN and checked by UKMO
Compilation errors to be fixed while using netcdf4NOCfixed see #755 and #75410 November
Modifications on Griffies operator to be addedNOC

Rules to follow:

  • all corrections to the developments done in 2010 should be made on the beta branch, not on the original branch
    - contributions to the documentation should be send directly to Gurvan, with Rachid on copy
    - between now and the end of the tag nemo_v3_2_2, correction of bugs has to be done on both the trunk and the beta branch when the bugs are in both versions


  • distribution to the developers at the beginning of november
    - tag a last stable version of nemo_v_3_2 (nemo_v3_2_2) at the end of december
    - put back the beta version on the trunk just after
    - tag and release of nemo_v3_3
    - delete the development branches for 2010 (if they went back to the new version of course)

Announcement of 3_3 to users (To be improved, in particular by adding the ticket number to find more details of the development)

Main features:

Scientific and numeric Developments

  • Lateral ocean physics: Griffies operator added
  • Vertical mixing scheme Generic Length Scale (GLS) added
  • Changes in bottom boundary layer (bbl)
  • Develop mixed laplacian-bilaplacian diffusion
  • Time stepping : modified Leap-Frog Asselin filter (MLF) implemented
  • Sea-ice: the Elasto-Visco Plastic (EVP) rheology has been added in LIM2 (the oldest version of the sea-ice component)
  • Atmospheric pressure forcing added
  • Change formulation of the fluxes between ocean, ice and atmosphere : an exchange of water (mass exchange) is now explicitly associated with an exchange of heat and salt content.
  • New implementation of river runoffs
  • Diurnal cycle added
  • Coupling interface for WRF atmospheric model added
  • Development of data assimilation modules OBS and ASM
  • Linear-tangent and Adjoint component (TAM) added, phased on tag 3.0

Computing Developments

  • Performance improvements in parallel (MPI)
  • Reorganisation in tracers transport computation (merge of TRA and TRC modules)
  • Biogeochemistry offline (TOP) reorganised (avoid duplication of routines between on-line and offline use of TOP)
  • "On the fly" interpolation tool added for input (forcing) files
  • Use of FCM (Flexible Configuration Manager) to build the chosen configuration, generate Makefile and run it to produce the executable)


  • Major updates in the reference manual, which is now more in phase with the code
  • Smaller updates on the web pages documentation (but FAQ page more active from now on)
  • Detailed documentation and results of the reference configuration ORCA2_LIM forced by CORE II

Major changes

  • In MPP, number of processors is now specified by cpp keys: -Dkey_nproci=2 -Dkey_nprocj=2 for instance'
  • use of FCM changes the directory hierarchy and the way to set up a configuration and create an executable