Journal of the Oceanographical Society of Japan
Online ISSN : 2186-3113
Print ISSN : 0029-8131
ISSN-L : 0029-8131
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Volume 24, Issue 6
Displaying 1-6 of 6 articles from this issue
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  • A Spectrophotometric Method for Determination of Cobalt in Sea-water after Enrichment with Solid Manganese Dioxide
    Rinnosuke FUKAI
    1968 Volume 24 Issue 6 Pages 265-274
    Published: December 31, 1968
    Released on J-STAGE: June 17, 2011
    DOIhttps://doi.org/10.5928/kaiyou1942.24.265
    JOURNAL FREE ACCESS
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    Detailed procedures for the determination of cobalt in sea-water are described. These involve the pre-concentration of trace amounts of cobalt by the adsorption on solid manganese dioxide, followed by desorption with nitric acid, successive solvent extraction with 2-nitroso-1-naphthol and final spectrophotometry with nitroso-R salt reagent. During the analysis, recovery of cobalt is controlled using cobalt-58 as a tracer. This simple enrichment procedure to obtain cobalt from sea-water minimizes the risk of eventual contamination and enables relatively large volumes of sea-water to be handled with reasonable speed, which is an advantage for routine work both on board ship and in the laboratory.
    The lower limit for determining cobalt in sea-water by the present method is estimated to be around 0.005μg Co/l for a 20-liter sample, while the standard deviation of the results of a single analysis would be ±0.1μg Co for the range up to 5μg Co as the total amount. The chemical form of cobalt determined by the present method is thought to be as the divalent cobalt cation, possibly in the hydrolized form, and the trivalent form, if any, being in colloidal dispersion.
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  • Primary Productivity Studies in February-March in the Northwestern Pacific off Japan
    Yusho ARUGA, Yasutsugu YOKOHAMA, Masami NAKANISHI
    1968 Volume 24 Issue 6 Pages 275-280
    Published: December 31, 1968
    Released on J-STAGE: June 17, 2011
    DOIhttps://doi.org/10.5928/kaiyou1942.24.275
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    Primary productivity studies were carried out in February and March 1966 at 15 stations in the northwestern Pacific off Japan. Estimated depth of the photosynthetic zone (or euphotic zone) ranged from 48 to 80 m. Chlorophyll a concentration in water varied from 0.026 to 0.621 mg/m3, of which small values less than 0.1mg/m3 were usually obtained in deeper layers far below the euphotic zone. Total amount of chlorophyll a in the euphotic zone was 8.2-28.8mg/m2. The vertical chlorophyll profiles indicated no distinct pattern, and a considerable amount of chlorophyll with high photosynthetic ability was found in the deeper layers. Photosynthetic rates of phytoplankton measured at 14 klux ranged from 0.024 to 23.0 mgC/mg. chl. a/h, normally from 1 to 8mgC/mg. chl. a/h. At two stations the photosynthetic rates of phytoplankton from various depths were measured at various temperatures and compared with each other. The estimated primary gross production is 0.3-0.8gC/m2/day, indicating that a fairly high level of primary productivity is maintained in the present area in February and March. Annual gross production was estimated to be 100-150gC/m2 in the Kuroshio area and 200-250gC/m2 in the Oyashio area.
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  • Micro-meteorological Observations over the Sea (1)
    Tosio NAN-NIT, Akimitsu FUJIKI, Hideo AKAMATSU
    1968 Volume 24 Issue 6 Pages 281-294
    Published: December 31, 1968
    Released on J-STAGE: June 17, 2011
    DOIhttps://doi.org/10.5928/kaiyou1942.24.281
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    Wind speed, air and water temperatures, vapour pressure, net incoming radiation from the sun and the sky were observed near the sea surface.
    Wind speed observations show that when the wind speeds at 6.1 m height are lower than 5 m·sec-1, no kinks can be seen in their profiles, but when they exceed 7 m·sec-1, kinks can be seen at 0.6-1.1 m heights above the sea surface. These two types of profiles are chosen by the state of the sea surface and wind speed.
    The wind observations also support the relation z0=u*2 / (ag) as suggested by CHARNOCK.
    The individual time change of water temperature was mostly explained by the residual, which is the heat remainder by subtracting the sensible and evaporation heat from the net incoming radiation to the sea surface.
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  • Direct Current Measurements in the Frontal Zone of a Coastal Upwelling Region
    C. A. COLLINS, C. N. K. MOOERS, M. R. STEVENSON, R. L. SMITH, J. G. PA ...
    1968 Volume 24 Issue 6 Pages 295-306
    Published: December 31, 1968
    Released on J-STAGE: June 17, 2011
    DOIhttps://doi.org/10.5928/kaiyou1942.24.295
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    Float and flow current measurements made in September 1965 in a frontal zone associated with coastal upwelling off Oregon are described; flow measurements made the following September, with similar results, are also described. The float and flow techniques gave equivalent values for the mean flow but not for the periodic components. The frontal zone was a region of high vertical shear for both mean and periodic flows : above the frontal layer, the mean flow was usually southward and offshore; below the frontal layer, the mean flow was northward and onshore. Semidiurnal tidal currents rotated counter-clockwise above the frontal layer and clockwise below the frontal layer. Inertial period currents rotated clockwise at all depths. A temperature inversion and a speed maximum were in close proximity to the lower portion of the frontal layer. The width of the poleward subsurface flow and of the speed maximum was at least 40 kilometers. To adequately measure the dynamic structure of a frontal zone in the coastal upwelling region, we found it desirable to sample hourly for at least one lunar day at 5 or 10 meter vertical increments across the frontal layer and to make observations at 5 or 10 kilometer spacings prependicular to the coastline.
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  • On the Automatic Turbidity Measuring Instrument
    Kozo HISHIDA, Sozaburo KOZIUMI, Katsunobu NISHIYAMA
    1968 Volume 24 Issue 6 Pages 307-309
    Published: December 31, 1968
    Released on J-STAGE: June 17, 2011
    DOIhttps://doi.org/10.5928/kaiyou1942.24.307
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    When a continual measurement of turbidity in the sea water is automatically carried out by the use of the submarine detector measuring the attenuation rate of parallel light beam through the water, it seems generally that water-tight cases containing the light source and the light receiver are apt to become dirty for a while in the sea water. To avoid such a trouble even a little, an instrument suitable for the automatic determination of turbidity has been devised by the authors. The principle employed is the measurement of scattered light intensity through the water as well as that of attenuated light intensity. And thus, the light receiver consists of a photo conductive cell at the centre and the surrounding twelve cells for the attenuated light and the scattered light respectively. Some results and considerations are represented with this new type turbidity meter, which may be considered applicable for some practical purposes.
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  • Trace of Chlorophyll Pigments in Stomachs of Deep Sea Zoo-Plankton
    Takahisa NEMOTO, Yatsuka SAIJO
    1968 Volume 24 Issue 6 Pages 310-312
    Published: December 31, 1968
    Released on J-STAGE: June 17, 2011
    DOIhttps://doi.org/10.5928/kaiyou1942.24.310
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