Journal of the Oceanographical Society of Japan
Online ISSN : 2186-3113
Print ISSN : 0029-8131
ISSN-L : 0029-8131
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Volume 12, Issue 4
Displaying 1-6 of 6 articles from this issue
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  • On the Relation between Abnormal Distribution of Blue Mud and Fishing Ground
    Michihei HOSHINO
    1956 Volume 12 Issue 4 Pages 103-107
    Published: December 25, 1956
    Released on J-STAGE: June 17, 2011
    DOIhttps://doi.org/10.5928/kaiyou1942.12.103
    JOURNAL FREE ACCESS
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    On some occassion, blue muds are distributed offing of river mouth and on the continental shelves where upwelling current occurs. These areas are rich in organic matter and sulfide is produced by thriving bacterial activity. It seems that sulfide is immediate cause of origin of “blue” mud. In these areas large foods for marine animals are distributed and this is a reason why there are good fishing grounds.
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  • Geostrophic Currents and Mixing
    Koji HIDAKA
    1956 Volume 12 Issue 4 Pages 109-110
    Published: December 25, 1956
    Released on J-STAGE: June 17, 2011
    DOIhttps://doi.org/10.5928/kaiyou1942.12.109
    JOURNAL FREE ACCESS
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    Hydrodynamical equations of stationary ocean currents are integrated taking the effect of vertical eddy viscosity into account, and it is shown that the expressions for geostrophic currents generally used are approximately valid in this case too.
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  • A Note on the Pressure Changes of the Two-layer Ocean
    Kozo YOSHIDA
    1956 Volume 12 Issue 4 Pages 111-116
    Published: December 25, 1956
    Released on J-STAGE: June 17, 2011
    DOIhttps://doi.org/10.5928/kaiyou1942.12.111
    JOURNAL FREE ACCESS
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    Time constants for the responses of the pressure changes of the stratified two layer ocean to the changes in winds applied at the ocean surface are examined. The dependence of the constants upon the scale, of time as well as of length, is discussed. The present note is only a preliminary one to further development which is intended in more practical connection with the problems in synoptic or descriptive oceanography.
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  • A Note on Current Branches in the Oyashio Area
    Jiro SUGIURA
    1956 Volume 12 Issue 4 Pages 117-119
    Published: December 25, 1956
    Released on J-STAGE: June 17, 2011
    DOIhttps://doi.org/10.5928/kaiyou1942.12.117
    JOURNAL FREE ACCESS
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    There are observed several current branches in the Oyashio area. The author named these branches as a) Oyashio main current, b) Oyashio counter current, c) neritic water current off the coast of Tokachi, and investigated characters of each branches. Further, origins of the so called first branch and second branch of the Oyashio those observed in the sea east of Honshu were investigated.
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  • Note on the Eddies Generated around the Turbulent Jet Flow
    Kiyomitsu KITANO
    1956 Volume 12 Issue 4 Pages 121-124
    Published: December 25, 1956
    Released on J-STAGE: June 17, 2011
    DOIhttps://doi.org/10.5928/kaiyou1942.12.121
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    According to the results obtained by the model experiments, the eddies which were generated around the free boundary layers along the turbulent jet flow should be classified in following types ; the oval type, sphere type, shell type. twin type and the triple type. The similarities of the oceanic phenomena between the Gulf Stream in the North Atlantic and the Kuroshio Extension in the North Pacific are further emphasized as the possible characteristics of the stationary eddies which were generated around the free boundary layers along the turbulent jet flow.
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  • Seasonal Variation of Phytoplankton at the Ocean Weather Station “X” (1950-1952)-1
    Masataka KITOU, Osamu ASAOKA
    1956 Volume 12 Issue 4 Pages 125-128
    Published: December 25, 1956
    Released on J-STAGE: June 17, 2011
    DOIhttps://doi.org/10.5928/kaiyou1942.12.125
    JOURNAL FREE ACCESS
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    Plankton samples were collected by ocean weather ships with Kitahara's quantitative nets (of Hensen type, 22.5 cm in mouth diameter, xx 13 of bolting silk) at the Ocean Weather Station “X” (39°N, 135°E) in the three years from 1950 to 1952. The nets were hauled vertically at the depths of 0 to 50 meters in February 1950 and at the depths of 0 to 100 meters in and after March 1950. The seasonal variations of phytoplankton are as follows:
    1. Generally speaking, the cell number of diatoms increases in early spring, autumn and summer with the exception of the summer of 1950. Dinoflagellates are abundant in spring and summer, and blue-green algae are rich in autumn. The important d'atom is Chaetoceros Hyalochaete in autumn to spring. Among Chaetoceros Hyalochaete, the important species is Chaetoceros decipiens in winter to spring, while it is Chaetoceros lorenzianus in autumn. The tropical species indicating the southern Kuroshio waters appear frequently in summer to autumn, and not at all or very scarcely in winter to spring. The frequent occurrence of the warm water species of Dinoflagellates is restricted almost to the period summer to autumn. It is a remarkable phenomenon that some diatoms, such as Chaetoceros atlanticus, C. densus, C. radicans, C. seychellarum, Dactyliosolen tenuis, Eucampia zoodiacus, Nitzschia seriata, nalassionema nitzschioides and Thalassiothrix longissima become dominant.
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