july 2009 NEMO User meeting 1

2009 and 2010 evolution

Gurvan Madec + the NEMO team

+ the NEMO developer committee

NEMO ‘2009’ User Meeting

- Introduction

- Planned objectives for 2009

- Road map 2009

- Planned objectives for 2010+

july 2009 NEMO User meeting 2

#1- “shared” = daily support to users, web & paper documentation, model user interface.

#2- “sustainable” = inscribed in a long term perspective: well thought architecture and interfaces

#3- “state-of-the-art”= development/implementation of upgraded physics and numeric

#0- “specific action”= priority development for the current year

NEMO = a shared, sustainable, and state-of-the-art platform for research and operational oceanography.

july 2009 NEMO User meeting 3

Planned Objectives 2009: 1/2

#0 O/I/A environment (“coupled ready”)• generic coupling interface (achievement)• documented ORCA2-LIM and its physics based on NEMO (IsENES)

#1 user friendly (“shared”)• IOM - for output (first implementation)• Configuration manager (2 years, start in mid 2009) (My_Ocean)• TOP & LIM3 paper and web documentation (2009)• reference configurations (continuation)

#2 developer friendly (“sustainable”)• suppression of rigid-lid option• rewriting of mpp library + timing• VVL + improved time stepping

july 2009 NEMO User meeting 4

Planned Objectives 2009: 2/2

#3 new features (“state-of-the-art”)#3.1 - implementation of development (coming from outside NEMO team)

• Numerous physical package for climate ocean model (Tidal mixing, light penetration + ocean colour, diurnal cycle, ice-self param., katabatic winds)

• conservative leap-frog/Asselin filter• observation operator (NEMOvar consortium)

#3.2 - short-term developments (from the consortium members, end in 2009)• New forcing (tidal potential, atmos. pressure, new river input scheme)• embedded sea-ice & mass/heat/salt fluxes• lateral physics (iso-neutral operator, skew flux... etc.)• vertical physics (improvement of existing (tke2), addition of new one: GLS)• sea-ice improvements (momentum forcing, snow-ice formation, EVP on LIM2)

#3.3 - long-term developments (from the consortium members, will continue in 2010)• assessment of s-coordinate• split-explicit + variable volume (stability & conservation)• generalisation of the split-explicit free surface (merge flt-ts, optimisation)• AGRIF with sea-ice (from simple to fully AGRIFed)• TAM for NEMO (continuation)• high parallelisation on new plateforms

july 2009 NEMO User meeting 5

Additional Objectives 2009:UCL team : not formally member of the consortium, but…

• short-term (“state-of-the-art”) (expected in 2009)• fine calibration of LIM3 in ORCA2• thin-ice representation• tests of other plastic yield curves and ice strength param.

• long-term (“state-of-the-art”) (will continue in 2010)• development of a comprehensive snow model• development of a new formulation of ice rheology• development of an ice-biogeochimistry component

july 2009 NEMO User meeting 6

Road map 2009

• Version 3.2 (this summer) : the “coupled ready” tag (IPCC & co)• reported bugs and minor improvements (Stream 1 & 2)• generic coupled interface (Stream 0)• New physics (tmx, rgb+ocean color, tke2) (Stream 0 & 3)• IOM server (including “IPCC” required/requested output) (Stream 0 & 1)• VVL + improved time stepping (Stream 2 & 3)• mpp_lib cleaning (Stream 2)

• Version 3.3 (end 2009)• reported bugs and minor improvements (Stream 1 & 2)• New physics : diurnal cycle, lateral mixing, GLS, Fox-Kemper (Stream 0 & 3)• New forcing (tidal potential, atmos. pressure, new river input scheme) (Stream 3)• Suppression of rigid-lid (Stream 2)• Conservative Leap-Frog + Asseling filter (Leclair and Madec OM2009) (Stream 3)• Embedded sea-ice + mass/salt fluxes (Stream 3)• EVP rheology in LIM-2 (Stream 3)• observation operator (NEMOvar consortium) (Stream 1 & 3)

july 2009 NEMO User meeting 7

Objectives 2010+ — (1/3)

#0 Specific stream : consolidation + ”regional/coastal ready" • consolidation: make sure that the recent developments are working together (LIM3,LIM3+cpl, interpolation on-the-fly, AGRIF, AGRIF+LIM, IOM server....)

• consolidation of coastal simulations (zps* (vvl), s-coordinate, OBC & tides, tidal potential, atmos. pressure, tide diagnostics, time splitting scheme, Generic Length Scale, etc...) + addition of a coastal test configuration.• configuration manager (CFG-tools) : user-friendly interface, tools, and documentation in order to create a model configuration. (My_Ocean) The tools will include the generation of a grid, a bathymetry, an initial state, a forcing data set, open boundary conditions, and AGRIF zoom (shared tool with ROMS, SYMPHONIE and MARS3D)

• probably a coupled interface with WRF

july 2009 NEMO User meeting 8

Objectives 2010+ — (2/3)

#1 user interface : (“shared”)• configuration manager (CFG-tools) (see stream 0)

• IOM server : consolidation + new functionality + NetCDF for floats...

#2 developer interface : (“sustainable”)

• Improved parallelisation: optimise the number of communication (careful check of actually required communication, switch from 1 to 2 bands in the mpp overlap area … )

• simplification: suppression of the solvers by improving ts scheme• local source/sink of mass, heat and salt : add a generic local forcing term in the tracer equation that can be used in several features : runoffs, cla, bbl, tub-overflow, ice-shelf…

july 2009 NEMO User meeting 9

Objectives 2010+ — (3/3)

#3 new features : (“state-of-the-art”)#3.1 - implementation of development (from the community)

• Spectral nudging (DFO, Canada)• Smagorinsky-type diffusion/viscosity (DFO, Canada)• Neptune effect (Hollow & Wang JGR 2009) • Under ice-shelf seas (Campin et al. 2008) (2010-2011) (LEGI, LOCEAN)• Iceberg source, advection and melting (Jongma et al OM2009) (LOCEAN, LSCE) (2010-

2011) • Fast spin up of biological model (matrix-free Newton-Krylov) (Khatiwala) (2010)• …

#3.2 - developments (from the consortium members)• Physics: tub-like overflow, eiv=F(N2), waves in MIZ…• AGRIF + time splitting • AGRIF + sea-ice (from 0 order to LIM2 and 3 fully AGRIFed) • Revisit of TOP time stepping • Data assimilation interface• Tangent and Adjoint of NEMO (TAM)