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| Huh, Ca; Ku, Tl. |
| Seawater samples collected in the northeast Pacific from 112 degrees 50'W to 126 degrees 36'W along a latitudinal band (21-25 degrees N) have been analysed for Ra-228 and Ra-226. Both nuclides exhibit their characteristic distributions. In the surface water, the exponential-like decrease of Ra-228 away from Baja California can be interpreted by horizontal water mixing with eddy diffusion coefficients (K-x) of 1 x 10(6) cm(2) s(-1) and 5 x 10(7) cm(2) s(-1) for scale lengths of 200 km and 1000 km, respectively. In the bottom waters, the decrease of Ra-228 away from bottom sediments can be modeled by vertical eddy diffusivities (K-z) of 15-30 cm(2) s(-1) except at one station (24 degrees 16.9' N, 115 degrees 8.9' W) where a value of 120 cm(2) s(-1) is... |
| Tipo: Text |
Palavras-chave: Radium 228; Radium 226; Diffusion turbulente; Nord-Est Pacifique; Radium-228; Radium-226; Eddy diffusion; Northeast Pacific. |
| Ano: 1998 |
URL: http://archimer.ifremer.fr/doc/00325/43656/43218.pdf |
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| Hudier, E; Ingram, G. |
| We present series of data describing the small-scale structure of the boundary layer stratification in the vicinity and away from a 1.5 m pressure ridge keel. We then analyze the influence of pressure ridges on the spatial and temporal variability of the ocean boundary layer Our experiment was done during the melt in order to use small-scale salinity gradients to study the variability in intensity of mixing processes. High-resolution salinity records sampled at 0+, 25 and 50 cm from the ice-water interface were analyzed at two stations, one at 5 m and the other at 75 m from a pressure ridge keel. We observed that, in the immediate vicinity of the ridge, melting is associated with the periodic development and dissipation of a melt layer in relation with the... |
| Tipo: Text |
Palavras-chave: Glace; Rugosité; Couche limite; Diffusion turbulente; Ice; Roughness; Boundary layer; Eddy diffusivity. |
| Ano: 1999 |
URL: http://archimer.ifremer.fr/doc/00325/43598/43981.pdf |
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