nemo developments and application at the bedford institute of oceanography, canada f. dupont, y. lu,...
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NEMO Developments and application at the Bedford Institute of Oceanography,
CanadaF. Dupont, Y. Lu, Z. Wang, D. Wright
Nemo user meeting 2009Dalhousie-DFO
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Code updates NEMO2.3
Spectral nudging enabled in NEMO. AGRIF enabled with ice included (LIM2). Neptune Effect. JGR, Holloway and Wang, accepted.Smagorinsky type eddy diffusion parametrization.OBCs fully enabled. No computed phase velocity used, advective velocity instead for radiation. Best would be to include first-baroclinic phase speed. OBC volume conservation for multi-processors: missing mask for active nodes, added double double precision summation.OBC tides, including astronomical tides.
Dalhousie-DFO Nemo user meeting 2009
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Spectralnudging
No-spectralnudging
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AGRIF test with ¼ degree NA with 1/12 degree embedded.
This test run has been run for only 5 years and the statistics only excludes the first 12 month
Remaining issues: correcting at each time-step E-P fields too difficult. Annual volume correction done instead.
Nemo developer meeting 2009
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AGRIF NO-AGRIF
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Increasing Resolution Regionally: Example of SST and Sea Ice Prediction
Based on Local Grid Refinement
Results from a 1 degree global model with a NA zoom to ¼ degree
Region with ¼ degree resolution
Results from enhanced resolution region illustrating new ability to use AGRIF in ice infested regions
White indicates ice cover
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Application to the global circulation using ORCA1 (UK setup)
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RMS of InterAnnual Sea-Level 1993-2004
Obs
1º model
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Tropical Pacific Variability
Also reproduces changes associated with MJO
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Forcing sensitivity – Interannual VariabilityForcing sensitivity – Interannual Variability
Wind
Heat
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Benefit of Increased Resolution:Sub-surface Flow from ¼° model
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1º NEMO Multi-Decade Simulation using CORESea-ice concentration 1990-1996
Model (left) Obs. (right)
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September integrated ice area
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Fram Strait transport
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Regional variation in
ice area
Wind important in all regions for interannual variations
Heat forcing mostly important in REG1
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March Sea-ice velocity for the last year of a 10 year run
1º model with OMIP forcing
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March Sea-ice velocity for the last year of a 6 year run
1/4º model with OMIP forcing
Although ocean currents are more realistic in the 1/4° simulation, the sea ice velocities are apparently still substantially overestimated.
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Code Questions
AGRIF + NEMO3: FLD issue -> has 'conv' been updated for dealing with FORTRAN structure type? If not, this sounds like a prirority.BBL issues?Restartibility issue?AGRIF + time-splitting.This would require that the barotropic variables (ssh,ua_e) are interpolated in time at each barotropic time-step and force the child domain at the boundary. Useful for tidal applications.
Dalhousie-DFO Nemo developer meeting 2009
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NEMO BBL Problem
Model: NEMO2.3 ORCA1, 46 levels CORE “normal-year” forcing
Test runs: Run 1: BBL diffusion set to 2000 m2/s Run 2: BBL diffusion set to 20000 m2/s
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NEMO BBL Problem
Run with small BBL diffusion
Run with large BBL diffusion