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f67abf1ee3 Jeff*0001 Global state estimation of the ocean
0002 ------------------------------------
0003
0004 An important application of MITgcm is in state estimation of the global
0005 ocean circulation. An appropriately defined ‘cost function', which measures
0006 the departure of the model from observations (both remotely sensed and
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).
