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| Mcrea, Je; Greene, Hg; O'Connell, Vm; Wakefield, Ww. |
| The application of marine geophysics and GIS techniques to the characterization of benthic habitats has increased the ability of fisheries managers to assess distribution and habitat types beyond common practices. We report upon a 150 kHz sidescan sonar survey offshore of Kruzof Island, Alaska undertaken to characterize rockfish (Sebastes) habitat. Using GIS, MapGrafix and Map*Factory we determined the percentage of seafloor cover that exists in our survey area. Bathymetry in the study area was determined with sidescan interferometry. All XYZ data were gridded using Surfer and plotted in shaded relief, bathymetric contour, and 3-dimensional formats. Contoured bathymetry was used as an overlay in MapGrafix. Small sub-areas were extracted from the... |
| Tipo: Text |
Palavras-chave: Habitat; Mégahabitat; Mésohabitat; Balayage; Cartographie; Habitat; Megahabitat; Mesohabitat; Sidescan; Mapping. |
| Ano: 1999 |
URL: http://archimer.ifremer.fr/doc/00325/43591/44031.pdf |
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| Nozaki, Y; Yamada, M; Nakanishi, T; Nagaya, Y; Nakamura, K; Shitashima, K; Tsubota, H. |
| Presented here is the first detailed geochemical data set on the U/Th series Th, Pa, Ac, and Pb isotopes and artificial fallout radionuclides (Sr-90, Cs-137, and Pu isotopes), and some trace elements (V, Zn, Cd, Cu, Mn, and Ni) in two water columns of the Japan and Bonin trenches down to the bottom depths of 7585 m and 9750 m, respectively. Hydrographic properties such as temperature, salinity, dissolved oxygen, and nutrient content within the trench valley remain constant at the same levels as those in the bottom water of the Northwest Pacific basin (typically similar to 6000 m in depth). The radionuclide activities and most trace metal concentrations are also not very different from those in the overlying water at depths of around 5000-6000 m. This means... |
| Tipo: Text |
Palavras-chave: Uranium - thorium; Nucléide artificiel; Balayage; Métal-trace; Temps de résidence; U/Th series nuclides; Artificial radionuclides; Scavenging; Trace metals; Renewal of trench water. |
| Ano: 1998 |
URL: http://archimer.ifremer.fr/doc/00326/43669/43201.pdf |
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