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| Colin, C. |
| The wind, temperature and current data collected during the joined French-USA FOCAL/SEQUAL programme carried in the equatorial Atlantic band in 1983 and 1984, allowed for the first time a simultaneous study of both the equatorial and coastal (5-degrees-N) upwellings along 4-degrees-W. At the equator, the decreases of both the surface temperature and the depth of the thermocline in boreal summer are correlated with the zonal component of the local windstress in the period band 1-2 months. This corresponds to the time required by the thermocline to lift up at 0-4-degrees-W in the presence of an easterly wind. The local wind cannot however explain the entire vertical variability of the thermal structure at 0-4-degrees-W. The correlation function shows in... |
| Tipo: Text |
Palavras-chave: GULF OF GUINEA; UPWELLING; EQUATOR; ADVECTION; DIFFUSION. |
| Ano: 1991 |
URL: http://archimer.ifremer.fr/doc/00101/21252/18865.pdf |
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| Blanc, G; Doussan, C; Thomas, C; Boulegue, J. |
| We present a non-steady-state diffusion and advection model that describes the distribution of methane, manganese and silica concentrations versus depth at sites 671, 676, and 672 of ODP Leg 110 through an oceanic sedimentary pile undergoing horizontal shortening by means of thrust-faults and folds. The model suggests that the distribution of these chemical components above and below fluid flow conduits is controlled by molecular diffusion. Upward fluid advection from the pathways to the surrounding sediments appears to be without significance for this environment (about 1.10(-11) m.s-1, i.e. almost-equal-to 0.3 mm.yr-1). Estimates of the time necessary to produce the diffusion profiles indicate that average ages of the chemical anomalies increase from... |
| Tipo: Text |
Palavras-chave: NUMERICAL MODEL; INTERSTITIAL WATER; DIFFUSION; ADVECTION; DIAGENESIS. |
| Ano: 1993 |
URL: http://archimer.ifremer.fr/doc/00100/21137/18757.pdf |
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