[Mitgcm-support] Adjoint assimilation: where improvement & degradation occur?

[mitgcm-support at dev.mitgcm.org]

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The comparison of subsurface temperature esitmated from adjoint
assimilation (1997) with TAO data averaged over all mooring sites was
posted before[1] . The spatial distribution of improvement and
degradation was not shown. This plot[2] shows this distribution over
various depth ranges: improvement: both rms deviation from and
correlation with TAO data improved. degradation: both rms deviation from
and correlation with TAO data degraded. no change: only rms deviation
from or correlation with TAO data improved. Little degradation is found
near the thermocline: 40 improved vs. 3 degraded at 75-150 m, and 31
improved vs 2 degraded at 150-225. Degradation mostly occurs in the
mixed layer (top panel) near 165-190E, 0-10S (close to the warm pool).
The cause of which is under-investigation: most likely due to salinity
effect.

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[1] http://escher.JPL.NASA.GOV:2000/HyperNews/get/forums/assim/110/1.html
[2] http://escher.jpl.nasa.gov:2000/hosts/escher/escher4/medea/tlee/FIG_FORUM/evaluate_tao_t_depth.jpg