赤道周近海域におけるDOの航走連続記録-1-低酸素帯の検出方法とその分布

概要

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In order to detect the boundary of water masses, continuous records of DO content in the surface waters of the Equatorrial Current and adjacent seas were determined. The experiments were carried out aboard the Kagoshima Maru (1038 ton) of the Kagoshma University in 1975 and 1976. DO meter (Y.S.I. model 57) was set in the engine room of the vessel. The water was supplied continuously to the oxygen electrode by 3.5m pressure head at 200ml per minute. The DO contents were recorded by an universal recorder (Yokogawa model 3047) in a cabinet laboratory. Special caution was taken to maintain uniformity of cruising speed and prevent air bubbles in the electrode. When the boat was sailing in the current rips, DO content of the surface water decreased significantly in the range of 0.04 to 0.60ppm. Many oxygen decline belts were recorded around the Equatorial Current and adjacent seas. Several types of belts were observed depending, probably, on the features of the current rips.