[[TOC(heading=Release_v3_4)]]

= '''Release 3.4''' =  
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== '''Current status''' ==

Version 3.4 is currently a beta release (since 2011/12/22), so any feedback is welcome. The trunk version stil contains a stable version of 3.3.1[[BR]]
An extensive review of the changes included in the 3.4_beta can be found here http://forge.ipsl.jussieu.fr/nemo/report/44
Documentation has been updated accordingly and is available there http://forge.ipsl.jussieu.fr/nemo/browser/branches/2011/dev_NEMO_MERGE_2011/DOC/NEMO_book.pdf

== ''Practical informations''' ==

The beta version doesn't correspond to a given tag but is located on a svn branch dev_NEMO_MERGE_2011 which can be browsed there http://forge.ipsl.jussieu.fr/nemo/browser/branches/2011/dev_NEMO_MERGE_2011.[[BR]]
 In practice, the initial version of the beta was revision 3237 on this branch. You will be able to update the beta by performing ''svn update '' under the root repository.

== '''Major improvements''' ==

=== New physics and numerics  ===
   * new pressure gradient suitable for s-coordinate (namelist ln_hpg_djc)
   * completion of Griffies iso-neutral diffusion (ln_traldf_grif)
   * back to a semi-implicit bottom friction (bugfree) #867 (namelist ln_bfrimp) 
   * add Pacanowski-Philander scheme for computation of Ekman depth in zdfri wiki:ticket851
   * add a new bulk formulae wiki:ticket/850 (namelist ln_blk_mfs and namsbc_mfs)
   * introduce a drag coefficient compute by wave model (new namelist &namsbc_wave)
   * add tidal potential forcing (new &namelist nam_tide)
   * Netpune effect parametrization #843
   * point to point MPI communication for north fold (namelist ln_nnogather)
   * allow sub timestepping for biogeochemistry models when using non-linear free surface wiki:ticket/855

=== Configurations, diagnostics and  tools ===
   * suppression of POMME configuration
   * addition of a regional configuration AMM12 (key_amm_12km and input files http://dodsp.idris.fr/reee512/NEMO/amm12_inputs_v3_4.tar)
   * improvement of format for lagrangian floats wiki:ticket/859
   * online computing of transport across sections wiki:ticket/864 
   * tidal harmonic analysis (new namelist &nam_diaharm)
   * tools to prepare input files for observation operator wiki:ticket/869

=== System simplification ===
   * simplification of dynamic allocation
   * end of merge TRA/TRA (no more separate 3d arrays for tracers, only 4d)
   * suppression of obsolete hpg options
   * more flexible definition of BDY input data wiki:2011WP/2011Stream2/OpenBoundaryProgress2011
   * simplification of interfaces toward biogeochemical models wiki:ticket/846
   * interface with CICE in coupled mode wiki:ticket/662
   * Use of fldread to read/interpolate dynamical input data for OFFLINE configurations

== '''Minor fixes / enhancements''' ==

||#812||major corrections for non-linear free surface||
||#894||new options in makenemo||
|| #882   || bug in ldfslp   ||
||#800|| razdf_imp without rotation ||
||#821||correction for sediment model ||
||#823  ||bug in bbl for offline     ||