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| Ganachaud, Alexandre; Mercier, Herle. |
| [1] Wind friction at the ocean surface introduces energetic variations in the net mass transport across the oceanic basins. To conserve mass, the whole water column adjusts rapidly, introducing a depth-independent perturbation in the pressure field. This signal is analyzed in a high resolution numerical model of the Atlantic Ocean. While the pressure perturbation cannot be extracted from the energetic sea surface height signals, it represents up to 90% of the bottom pressure signal when integrated across the Atlantic Ocean in the daily and monthly frequencies. This signal will be an important part of the signal measured by the GRACE (Gravity Recovery And Climate Experiment) mission. |
| Tipo: Text |
Palavras-chave: Eckman transport; Numerical model; Pressure perturbation; Ocean surface. |
| Ano: 2002 |
URL: http://archimer.ifremer.fr/doc/2002/publication-490.pdf |
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| Quilfen, Yves; Bentamy, Abderrahim; Delecluse, P; Katsaros, K; Grima, N. |
| Uncertainties in the surface wind field have long been recognized as a major limitation in the interpretation of results obtained by oceanic circulation models. It is especially true in the tropical oceans, where the response to wind forcing is very strong on short time scales. The purpose of this paper is to show that these uncertainties can be greatly reduced by using spaceborne wind sensors that provide accurate measurements on a global basis.Surface winds over the global oceans have been measured by scatterometry since the launch of the European Remote Sensing Satellite (ERS-1) in August 1991 by the European Space Agency, Noordwijk, The Netherlands, and is currently provided by ERS-2, launched in April 1995. The ground track wind vectors are processed... |
| Tipo: Text |
Palavras-chave: Ocean model; Ocean surface; Scatterometer; Sea level. |
| Ano: 2000 |
URL: http://archimer.ifremer.fr/doc/00000/10501/9560.pdf |
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| Kudryavtsev, V; Hauser, D; Caudal, G; Chapron, Bertrand. |
| normalized radar cross section (NRCS) over the sea surface. However, these models are not able to correctly reproduce the NRCS in all configurations. In particular, even if they may provide consistent results for vertical transmit and receive (VV) polarization, they fail in horizontal transmit and receive (HH) polarization. In addition, there are still important discrepancies between model and observations of the radar modulation transfer function (MTF), which relates the modulations of the NRCS to the long waves. In this context, we have developed a physical model that takes into account not only the Bragg mechanism but also the non-Bragg scattering associated with radio wave scattering from breaking waves. The same model was built to explain both the... |
| Tipo: Text |
Palavras-chave: Radar cross section; Ocean surface; Surface gravity waves; Wave breaking; Modulation transfer function; Non Bragg scattering. |
| Ano: 2003 |
URL: http://archimer.ifremer.fr/doc/00000/10183/9581.pdf |
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