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Experiences and expectations of NEMO Andrew C. Coward, Steve Alderson and Beverly de Cuevas.

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Presentation on theme: "Experiences and expectations of NEMO Andrew C. Coward, Steve Alderson and Beverly de Cuevas."— Presentation transcript:

1 Experiences and expectations of NEMO Andrew C. Coward, Steve Alderson and Beverly de Cuevas

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3 Benefits of NEMO: Curvilinear grids - tripolar

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5 NEMO Users meeting : Thursday 22nd (afternoon) and Wednesday 23rd (morning) May 2007 Coupled models CICLE project at the CNRM - M. Lucas MERSEA project and ECMWF system 4 prototype - A. Troccoli First analyses of the new version of the sintex-F coupled model - C. De Boyer Montegut Progress on incorporating NEMO into the next Met Office climate model - C. Harris Grid computing with ARPEGE-NEMO coupled model - E. Maisonnave Operational Oceanography UK operational ocean forecasting with NEMO - A. Sellar 1/12 ocean simulations with Mercator configurations - Y. Drillet The MERSEA/Mercator Ocean global 1/4 analysis and forecasting system V2 : first results - G. Garric Implementing NEMO in the new version of the Mediterranean Forecasting Sytem - S. dobricic for P. Oddo Biogeochemistry of the ocean Iron and C13 in NEMO-PISCES - A. Tagliabue Biowaves project: first results from coupled physical/biogeochemical simulations in the N. Atlantic - G. Charria Modeling the neodymium isotopic composition with the NEMO global ocean circulation model - T. Arsouze Evidence for strong submesoscale variability of pCO2 in the northeast Atlantic Ocean - L. Resplandy Developments / Portability LIM3 a new sea ice model coupled to OPA - M. Vancoppenolle Toward an alternative to the Leap Frog time stepping - M. Leclair Impact of optimized calculation of Coriolis terms in the Mediterranean model set-up - S. dobricic An update on the OASIS coupler development - S. Valcke Dynamics of the ocean Decadal variability of oxygen, temperature and salinity in mode and intermediate waters - J. Clark SSS sensitivity in the Eastern North Atlantic subtropical gyre - B. Mourre Diagnosis of IGW in an OGCM : an intercomparison between numerical simulations and in situ-measurements - X. Levaillant (pdf) pdf Diagnosing the ocean control on the seasonal migration of the Marine ITCZ - A. Lazar

6 OCEANS 2025: Themes and selected scientific objectives Theme 9: Next Generation Ocean Prediction Systems : How sensitive are climate models to the manner in which sea ice is coupled? Can nested models be trusted to give accurate results? Can an ocean model be made energetically self-consistent? What is the most appropriate level of complexity of biogeochemical models in climate studies? Approaches and methodologies: Develop NEMO as the core OGCM for use by the scientific community in the UK, at resolutions of 1°, ¼°and 1 / 12 °, and with nested grids (WP 9.10). Develop an ocean model testbed permitting objective intercomparison and validation of a range of ecosystem models, with a view to embedding the most promising in OGCMs (WP 9.11).

7 OCEANS 2025: Themes and selected scientific objectives Theme 2: Marine Biogeochemical Cycles To determine the sensitivity to future climate change of the mechanisms sustaining total nutrient supply to the photic zone over the three major biomes of the North Atlantic. Approaches and methodologies: Quantify the magnitude and sensitivity of nutrient fluxes associated with winter overturning and Ekman pumping. For overturning, this will be achieved using time-series stations, Argo floats and mooring data together with previous studies and basin-scale simulations (NEMO both at ¼º and with a smaller scale nested component at 1 / 12 º in the North Atlantic).

8 OCEANS 2025: Themes and selected scientific objectives Theme 1: Climate, Ocean Circulation, and Sea Level Model simulations of climate change in the ocean Identifying the causes of recent climate change in the ocean Physical-biogeochemical budgets and mixing in the Southern Ocean (DIMES) Research plan and deliverables: 2008: Completed simulation of changes in the ocean over the period obtained by running NEMO globally at 1/4° resolution (and with a nested 1/12° North Atlantic grid) using NCEP/NCAR (and possibly ECMWF) derived surface flux fields (WP 1.1b)

9 The UK is moving towards a more coordinated approach based on the NEMO model This forms the core of OCEANS 2025 with plans for (amongst others): Global 1/4 o models with biogeochemistry and 1/12 o nested regions Global 1/12 o physics only model by 2010

10 Theme 9: NOCS NEMO activities Produced global 1 degree NEMO configuration (ORCA1) [shared with UKMO] Tested ORCA1 with LOBSTER NPZD model, about to test new NOCS biogeochemistry model MEDUSA Developed interpolation on the fly option for handling surface forcing fields Constructed ORCA1 forcing datasets which are compatible with those used with the current DRAKKAR (global 1/4 o ) model Completed multi-decadal integrations of ORCA025 Developed capability to run AGRIF nests in sea-ice regions

11 ORCA1: 15 processors : 3.59s per timestep (2.75yrs/day) ORCA1: 30 processors : 1.97s per timestep (5yrs/day) ORCA025: 56 processors: Avg ts = ( 9 entries ) Min = Max = (0.28yrs/day) ORCA1: 32 processors with LOBSTER : 3.57s per timestep 16 processors 1.5s per timestep (~ 7 years/day) 64 processors 4.5s per timestep (~ 0.6 years/day) 512 processors 7.2s per timestep (~0.12 years/day) Performance On HECToR: ORCA025: 221 processors: Avg ts = 2.44 ( entries ) Min = 2.13 Max = (1.6yrs/day)

12 Current status of Drakkar configurations at NOCS Steven Alderson, Andrew Coward, Beverly de Cuevas, Adrian New, George Nurser, Yevgeny Aksenov, Jeff Blundell, Jeremy Grist Current status of Drakkar configurations at NOCS Steven Alderson, Andrew Coward, Beverly de Cuevas, Adrian New, George Nurser, Yevgeny Aksenov, Jeff Blundell, Jeremy Grist

13 N025_100 run (NOCS) Drakkar code with DFS3 forcing On-line interpolation of atmospheric fields cdmp = (5 times weaker than G70) icedmp = 25 (same as G70) (currently1997) Drakkar code with DFS3 forcing On-line interpolation of atmospheric fields cdmp = (5 times weaker than G70) icedmp = 25 (same as G70) (currently1997)

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18 Drake Passage and Bering Strait transport comparison N025_ ORCA025_G

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20 NOCS plans for 2008 Complete and analyse N025_100 Investigate CICE vs LIM3 Extend tests with AGRIF in North-west Atlantic Run ORCA025 with biogeochemistry Complete and analyse N025_100 Investigate CICE vs LIM3 Extend tests with AGRIF in North-west Atlantic Run ORCA025 with biogeochemistry

21 Experiments with AGRIF at NOCS Steven Alderson Work Package 2.5: … NEMO will be run globally at 1/4° with biogeochemistry and with a higher resolution 1/12° nested model …. Oceans 2025

22 Bathymetry data T/S data Nesting tools AGRIF nesting

23 NEMO AGRIF/NEMO code Conversion routine AGRIF library AGRIF interface routines AGRIF/ NEMO NEMO conversion to AGRIF

24 Order-1 nest in 1° global NEMO

25 Order-1 nest in 1° model: surface differences (30d)

26 Schematic for calculation of fluxes at water surface Outer model Nest (modified)

27 Order-1 nest in 1° model: surface differences (30d)

28 1° model vs order-3 nest in 1° model: SST (4mnth) longitude latitude

29 No nest model vs order-3 nest in 1° model

30 Continuity across restart files Higher resolution run (standard mpi_send) Blanking of areas (e.g. Pacific) AGRIF with biogeochemical models Southern Ocean region Continuity across restart files Higher resolution run (standard mpi_send) Blanking of areas (e.g. Pacific) AGRIF with biogeochemical models Southern Ocean region Further work


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