TERRAPUB Journal of Oceanography

Journal of Oceanography, Vol. 53 (No. 6), pp. 571-577, 1997

Transportation of Particulate Material through the Mouth of Tokyo Bay to the Open Ocean

Shinichiro Noriki1, Matomu Shimizu1, Kazuhiro Hamahara1, Hisashi Narita1, Toshiro Saino2 and Tetsuo Yanagi3

1Graduate School of Environmental Earth Science, Hokkaido University, Sapporo 060, Japan
2Institute for Hydrospheric-Atmospheric Sciences, Nagoya University, Nagoya 464-01, Japan
3Department of Civil and Ocean Engineering, Ehime University, Matsuyama 790, Japan

(Received 17 September 1996; in revised form 13 June 1997; accepted 17 June 1997)

Abstract: Vertical series sediment traps were deployed at two stations, and time series sediment traps were moored 10 m above the seafloor at three stations at the mouth of Tokyo Bay. Al, K, Mg, Mn, Si, Ca, P and organic N were determined in settling particles and surface sediments near the trap sites. Lithogenic aluminosilicate material formed over 50% of the settling particles at all stations. Total mass fluxes observed with vertical series sediment traps were 3-75 g/m2 day. Fluxes of Al and Mn increased with depth, and the Mn/Al ratio of settling particles collected at mid-depth showed a maximum due to the addition of reduced Mn diffused out from sediment of shallower depth. The flux of reduced Mn from the shelf edge of Tokyo Bay was calculated to be 18 mg/m2 day. Temporal variations of Al and Mn fluxes revealed that lithogenic particles were transported above the bottom of shelf edge of the mouth of Tokyo Bay to the open ocean.

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