|
|
|
|
|
| Brossier, F; Monier, L; Delecluse, P. |
| Wave-Like oscillations over a period of 30 days, with a wavelength of 1 000 to 1 200 km, have been observed in the Pacific Ocean between 2 degrees N and 4 degrees N. Eddies with the same time-space scale are present in the sea-level oscillations observed by satellites. A numerical modelling of these long equatorial waves is presented in this paper. Fluctuations of currents and density around given mean fields are computed by a cyclic perturbation model. The oceanic response has to fit given sea-level oscillations. Three sea-level data sets have been considered : one is deduced from Geosat altimetric measurements; the other two are analytically constructed, with random time-dependence. Three mean circulations have also been studied : no mean flow, and mean... |
| Tipo: Text |
|
| Ano: 1994 |
URL: http://archimer.ifremer.fr/doc/00099/21031/18657.pdf |
| |
|
|
| Masson, S; Luo, Jj; Madec, G; Vialard, Jerome; Durand, F; Gualdi, S; Guilyardi, E; Behera, S; Delecluse, P; Navarra, A; Yamagata, T. |
| In the present study, we use a coupled model to evaluate the effect of shallow salinity stratification on the sea surface temperature (SST) and on the monsoon onset in the southeastern Arabian Sea (SEAS). A 100-year control experiment shows that the coupled model reproduces the main climatic features in this region in terms of SST, precipitation and barrier layer (BL). A 100-year sensitivity experiment (where BL effects have been suppressed in the SEAS) shows that BL enhances the spring SST warming by 0.5 degrees C, and leads to a statistically significant increase of precipitation in May (3 mm/day) linked to an early (10 to 15 days) monsoon onset. This suggests that the BL extent may be a useful predictor of the summer monsoon onset in the area with a... |
| Tipo: Text |
Palavras-chave: Summer monsoon season; Surface temperature; Indian ocean; Mixed layer; Northeast monsoon; Southwest monsoon; Onset vortex; Coupled GCM; Mechanisms; Evolution. |
| Ano: 2005 |
URL: https://archimer.ifremer.fr/doc/00203/31422/29819.pdf |
| |
|
|
| 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 |
| |
|
| |
|
|
|
