Abstract

Aoshio, the oxygen-deficient blue-green turbid water, which after appears in the head of Tokyo Bay from summer to autumn and occasionally causes extensive damage to the short-necked clam Ruditapes phillipinarum one of the main catches in this area. Analysis of the meteorological (wind) and the oceanagraphical records (bottom current, temp., salinity, density, sulfide and oxygen) suggested the following process: When the prevailing on-shore winds became off-shore (N-NE) for more than 2-3 days, the wind-driven surface water moving off-shore induced the sulfide-containing bottom water to move upwards at the Funabashi coastal zone at the entrance to the harbor and to create aoshio which usually appeared in Funabashi Harbor at first.

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