Journal of the Oceanographical Society of Japan 

About: Journal of the Oceanographical Society of Japan is an academic journal published by Springer Science+Business Media. The journal publishes majorly in the area(s): Bay & Chemistry. It has an ISSN identifier of 0029-8131. Over the lifetime, 1194 publications have been published receiving 14282 citations. The journal is also known as: Journal of the Oceanographical Society of Japan.

N, N-Dimethylformamidelこよる植物プランクトンのクロロフィルの新しい定量法

Abstract: Non volatile N, N-dimethylformamide (DMF) at room temperature is proposed as a new solvent for determining the chlorophylla in cultured and natural phytoplankton samples. Advantages of DMF compared to the solvents ordinarily used are (1) higher extraction efficiency, (2) rapid extraction time of 30 min, (3) simple extraction procedure requiring neither extra heating nor grinding, but soaking, and (4) a long stable life of chlorophylla (at least one month at 5°C in the dark).

Local balance in the air-sea boundary processes: III. On the spectrum of wind waves

Abstract: A combination of the three-second power law, presented in part I for wind waves of simple spectrum, and the similarity of the spectral form of wind waves, leads to a new concept on the energy spectrum of wind waves. It is well substantiated by data from a wind-wave tunnel experiment.In the gravity wave range, the gross form of the high frequency side of the spectrum is proportional tog u*σ−4, whereg represents the acceleration of gravity,u* the friction velocity,σ the angular frequency, and the factor of proportionality is 2.0×l0−2. The wind waves grow in such a way that the spectrum slides up, keeping its similar form, along the line of the gross form, on the logarithmic diagram of the spectral density,φ, versusσ. Also, the terminal value ofφ, at the peak frequency of the fully developed sea, is along a line of the gradient ofg2σ−5.The fine structure of the spectrum from the wind-wave tunnel experiment shows a characteristic form oscillating around theσ−4-line. The excess of the energy density concentrates around the peak frequency and the second- and the third-order harmonics, and the deficit occurs in the middle of these frequencies. This form of the fine structure is always similar in the gravity wave range, in purely controlled conditions such as in a wind-wave tunnel. Moving averages of these spectra tend very close to the form proportional toσ−5.As the wave number becomes large, the effect of surface tension is incorporated, and theσ−4-line in the gravity wave range gradually continues to aσ−8/3-line in the capillary wave range, in accordance with the wind-wave tunnel data. Likewise, theσ−5-line gradually continues to aσ−7/3-line.Also, through a discussion on these results, is suggested the existence of a kind of general similarity in the structure of wind wave field.

Length-weight relationships of important zooplankton from the Inland Sea of Japan

Abstract: Measurements of dry weight, carbon- and nitrogen contents together with the body length of important zooplankton from the Inland Sea of Japan were made using freshly caught specimens. The values of the former three parameters were found to be highly correlated to length, and species specific regression equations were calculated for 10 species of Copepoda (Calanus sinicus, Euchaeta plana, E. concinna, Centropages abdominalis, Sinocalanus tenellus, Acartia clausi, A. tsuensis, Tortanus forcipatus, Oithona brevicornis andO. similis), 3 species of Cladocera (Podon leuckarti, P. polyphemoides andPenilia avirostris), 1 species of each of Mysidacea (Neomysis japonica), and Natantia (Acetes japonicus), and two forms of Chaetognatha (Sagitta crassa andS. crassa f.naikaiensis).

長崎湾におけるあびき現象 (湾内の大規模なセィシュ) の発生機構

Abstract: Large oscillations of water level in Nagasaki Bay are calledAbiki and are most frequently observed in winter. The largestAbiki recorded in the past 20 years at the tide station at Nagasaki occurred on March 31, 1979. Simultaneously, a distinct atmospheric pressure disturbance of solitary type with an amplitude of about 3 mb was recorded at several neighbouring stations in Kyushu, which indicated the pressure disturbance probably travelled eastward with an average speed of about 110 km h−1. The quantitative relation between this pressure disturbance and notable seiches observed in Nagasaki Bay is examined by means of numerical simulation, and it is confirmed that the exceptionally large range of oscillations in the bay, which reached 278 cm at the tide station, was indeed produced by this travelling pressure disturbance. The leading part of shallow water waves induced by the atmospheric pressure disturbance was amplified up to about 10 cm in amplitude, over the broad continental shelf region off China, because of near resonant coupling to the pressure disturbance. After leaving this continental shelf region, the amplified water wave converged into the shelf region (Goto Nada) surrounded by the north-western coast of Kyushu and the Goto Islands and excited eigenoscillations on the shelf. A train of waves thus formed with a period of about 35 min entered Nagasaki Bay and was resonantly amplified at periods of 36 min and 23 min which are the eigen periods of the bay. Besides resonance, the combined effects of shoaling and reflection inside Nagasaki Bay also enhanced the amplification.