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Numerical ocean model Workshop IPEE/CLS - 3-FEB-2010


What is a numerical model?
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NEMO


Numerical modelling
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· Ocean in equations y
(Approximations of)

Equations of geophysical fluids

x

Coherence and extrapolation: · spatial (« representation of a 3D fiel · temporal (« keep in memory... and
forecast »)

ds »)

· inter-variables

(« measure temperature, deduce salinity, compute currents...»)

z

(t)

(t+1)


Integrated system
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SATELLITE observation s

SSALTO

MODELISATION ASSIMILATION

IN SITU observation s

MERCATOR

CORIOLIS


Numerical grid
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ORCA Global Grid


Ocean model
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· Processes greater than the grid scale
­ Explicitly solved

· Processes sub grid scale:
­ Parameterized ­ i.e. vertical mixing horizontal mixing

· The higher the resolution the fewer parameterizations... but needs huge computation capacities


Limitations
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· · · · · ·

Initial conditions Atmospheric forcings Parametrisations Approximation (hydrostatic) Numerical cost Outputs (volume of data, 4D visualization)


Ocean in 3D
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Model outputs: temperature
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· From 0m to 5500m

75 m

125 m

200 m


Model outputs: salinity
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Concentration of salt in the water (ppm, % per thousand) Product available between 0 m and 5500 m

30 m

125 m