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f67abf1ee3 Jeff*0001 Global state estimation of the ocean
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0003
0004 An important application of MITgcm is in state estimation of the global
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0005 ocean circulation. An appropriately defined ‘cost function', which measures
0006 the departure of the model from observations (both remotely sensed and
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0007 in-situ) over an interval of time, is minimized by adjusting ‘control
0008 parameters' such as air-sea fluxes, the wind field, the initial conditions
0009 etc. :numref:`assim_figure` and :numref:`assim_figure2` show the large scale planetary
0010 circulation and a Hopf-Muller plot of Equatorial sea-surface height.
0011 Both are obtained from assimilation bringing the model in to
0012 consistency with altimetric and in-situ observations over the period
0013 1992-1997.
0014
0015 .. figure:: figs/globes.png
0016 :width: 60%
0017 :align: center
0018 :alt: assim_figure
0019 :name: assim_figure
0020
08815fc806 Jeff*0021 Circulation patterns from a multi-year, global circulation simulation constrained by Topex altimeter data and WOCE cruise observations. This output is from a higher resolution, shorter duration experiment with equatorially enhanced grid spacing.
f67abf1ee3 Jeff*0022
0023 .. figure:: figs/ssh_sim_assim_obs.png
0024 :width: 90%
0025 :align: center
0026 :alt: assim_figure2
0027 :name: assim_figure2
0028
08815fc806 Jeff*0029 Equatorial sea-surface height in unconstrained (left), constrained (middle) simulations and in observations (right).
