Journal of the Oceanographical Society of Japan

Alkylbenzenesulfonate (ABS) in the Bottom Muds of the Inner Part of Tokyo Bay

Yoshinari ABE

1973 Volume 29 Issue 1 Pages 1-7
Published: February 28, 1973
Released on J-STAGE: June 17, 2011

DOIhttps://doi.org/10.1007/BF02109583

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The contents of alkylbenzenesulfonate (ABS) in the bottom sediments were analyzed for the inner part of Tokyo Bay and five inflowing rivers. Methylene blue active substances (MBAS) was extracted from the dired sample with methanol-benzene mixture.
After the concentration of MBAS was determined by colorimetry, the ratio ABS/MBAS was estimated by an infrared spectrum of MBAS-MB complex. The net content of ABS was calculated from these two values.
The ABS contents in the surface of the bottom sediments of the rivers and sea ranged 1.9-59μg/g and 0-14.1μg/g dry weight, respectively. The contents of ABS in the river sediments reflected the degree of pollution of each river by urban waste waters. From the results of the analysis of the core samples of sea sediment at two points containing ABS only in the upper layer, the average rate of sedimentation of the bottom muds in the inner part of Tokyo Bay since the usage of ABS began was estimated as 3cm/year and 7cm/year respectively.

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On Aerial Measurement of Infrared Imagery of Sea Surface with Infrared Line Scanner

Hiroaki OCHIAI

1973 Volume 29 Issue 1 Pages 8-15
Published: February 28, 1973
Released on J-STAGE: June 17, 2011

DOIhttps://doi.org/10.1007/BF02109584

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This paper presents a system of the line scanner with InSb detector of filter band 2.0-5.5 microns, for obtaining infrared imagery from an aero-plane. Since its scanning sector is as large as 80 degrees, wide thermal imagery can easily obtained from comparatively low altitude. Displaying techniques of thermal pattern of sea surface are also discussed.
All data were stocked in the four-channel data recorder during measurements and analysed at the laboratory after landing.
Colored imagery and contoured imagery were made from the original thermal imagery by using computer.

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A Numerical Experiment on the Variations of Western Boundary Currents

Part I. Formation of Western Boundary Currents

Masahiro ENDOH

1973 Volume 29 Issue 1 Pages 16-27
Published: February 28, 1973
Released on J-STAGE: June 17, 2011

DOIhttps://doi.org/10.1007/BF02109585

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A numerical experiment is made using a barotropic model for the western boundary currents. The time-dependent, non-linear vorticity equation is integrated with and without the variable of bottom topography. The inertial and frictional boundary flow is resolved with a fine grid size of 10 km. Connection of the western boundary currents with the general circulation is facilitated by giving the fixed Sverdrup transport at the eastern boundary of the model (400 km offshore).
For the flat bottom topography, steady flow for Re=35 shows dynamical balance essentially of a frictional model. The transient response leading to the formation of the western boundary currents in the model seems to support the LIGHTHILL's theory (1969). For Re=350, unsteady features revealed by BRYAN (1963) is re-established. A phenomenon of barotropic instability is also observed with sufficient resolution. For the model with a continental slope the steady flow is also obtained for Re=35. The boundary currents flow over the continental slope, deviating offshore as they flow northward.

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A Numerical Experiment on the Variations of Western Boundary Currents

Part II. Response to a Moving Typhoon

Masahiro ENDOH

1973 Volume 29 Issue 1 Pages 28-43
Published: February 28, 1973
Released on J-STAGE: June 17, 2011

DOIhttps://doi.org/10.1007/BF02109586

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Response of the barotropic western boundary current to typhoon passage is investigated by the use of the numerical models described in Part I. Steady states obtained in Part I are chosen as the initial conditions for undisturbed currents. In these models it is assumed that an axially symmetric typhoon (radius =100km, maximum wind speed=27.4m/sec) moves parallel to the western boundary.
For the model with a flat bottom the boundary flow diminishes its strength and broadens its width after the passage of the typhoon offshore. For the model with a continental slope the effect of the typhoon is significantly different depending on the distance of the path of the typhoon from the western boundary. Specifically the north wind on the continental slope causes the formation of cyclonic vortex, which progresses southwards along the slope in the northern hemisphere. Linear theory of continental shelf waves indicates that the phase speed of the propagation of the vortex is 2.4m/sec. Anomalies of the water level along the coast are also calculated from geostrophic relationships.

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Possible Transformation of Zinc Dissolved in Mediterranean Coastal Sea Water

R. FUKAI, L. HUYNH-NGOC, C. N. MURRAY

1973 Volume 29 Issue 1 Pages 44-45
Published: February 28, 1973
Released on J-STAGE: June 17, 2011

DOIhttps://doi.org/10.1007/BF02109587

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