A four-year eddy-permitting assimilation of sea-surface temperature and altimetric data in the South Atlantic Ocean
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2002
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Abstract
Sea-surface temperature (SST) and sea-surface height (SSH) data are assimilated with a reducedorder sequential lter every 10 days over four years (1993)(1994)(1995)(1996) in a 1/3-degree resolution South Atlantic primitive equation model.At every assimilation step, the mis t between observations and their model counterparts is evaluated and projected onto the dominant 10 multivariate, full-depth local modes of variability diagnosed from a free model run (without assimilation).Satellite observations are used to perform a sequential update of all model variables according to their "natural" correlations with the surface variables.In this paper, we perform a validation of both the mean state and the eddy ow.Over the four years of assimilation, the forecast-data RMS mis t is decreased (i) by 55% on SSH; (ii) by 40% on SST; (iii) by about 20% on temperature in the upper 700 m with regard to independent, synoptic XBT data; (iv) as deep as 3500 m on the time-averaged temperature distribution compared to a recent climatology.These statistical estimates of the assimilation performance were complemented by a more original oceanographic investigation that revealed a signi cant improvement in the mean circulation (in particular in the Con uence region and in the deep ocean), the position of the main fronts, the averaged level and basin-scale distribution of SSH variance, the detailed evolution of individual mesoscale structures, the vertical distributionof the eddy kinetic energy, and the salinity eld.These results would further be improved by the assimilation of in-situ data below sharp thermoclines that tend to decorrelate subsurface dynamics from the observed surface.
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| Authors | Thierry Penduff, Pierre Brasseur, Charles‐Emmanuel Testut, Bernard Barnier, Jacques Verron |
| Journal | journal of marine research |
| Year | 2002 |
| DOI |
10.1357/002224002321505147
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| URL | |
| Keywords | Keywords not found |
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