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| Perigaud, C; Zlotnicki, V. |
| Geosat ERM data concerning the Indian Ocean over a period of 26 months were processed with two different techniques of orbit error reduction in order to improve the accuracy of estimates of large-scale meridional sea-level variations. The first technique removes an along-track polynomial of degree 1 over approximately 5,000 km; the second removes an along-track once-per-revolution sine wave (approximately 40,000 km). Averaged over the Indian Ocean, the difference between the two estimates represents 43 % of the total variance and 31 % of the annual variance. This difference contains both oceanic and error signals. Sea-level variations from both techniques show an error with a spectral peak at 7-degrees-6 zonal wavelength, 317-day period, propagating... |
| Tipo: Text |
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| Ano: 1992 |
URL: http://archimer.ifremer.fr/doc/00101/21178/18795.pdf |
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| Arnault, S; Perigaud, C. |
| Tropical oceans play a key role in climatic variations. Ocean-atmosphere interactions induce large-scale and low-frequency variations which, due to the specificity of tropical ocean dynamics, are very difficult to observe with traditional in situ measurements. During the past twenty years, a variety of numerical models of diverse complexity have contributed much to the description, understanding and prediction of ocean variability in the tropics. However, the capacity of these models to simulate adequately the ocean variability heavily depends on the accuracy of the atmospheric forcings and that of initial conditions. Satellite altimetry provides a unique opportunity to avoid the problem of scarce and non-synoptic in situ data coverage for the large-scale... |
| Tipo: Text |
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| Ano: 1992 |
URL: http://archimer.ifremer.fr/doc/00100/21174/18791.pdf |
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