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Volume 32 (1976)
- Issue 6 Pages 249-
- Issue 5 Pages 195-
- Issue 4 Pages 155-
- Issue 3 Pages 99-
- Issue 2 Pages 53-
- Issue 1 Pages 1-
Volume 32, Issue 4
Displaying 1-6 of 6 articles from this issue
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Toshio YAMAGATA1976 Volume 32 Issue 4 Pages 155-161
Published: August 30, 1976
Released on J-STAGE: June 17, 2011
JOURNAL FREE ACCESSThe flow induced by the two-dimensional line vortex moving in a rotating fluidis discussed. The governing vorticity equation is linearized adopting the Oseen approximation.
First, the problem is considered on a constant f-plane. The solution shows that theStewartson E1/4 layer is transformed into the Oseen wake as the role of the advection becomesimportant.
Second, the problem is considered on a β-plane. When the line vortex moves westward, the solution shows a pattern of Rossby lee waves decaying downstream of the vortex andalternating flows far upstream. When the line vortex moves eastward, the inviscid solutionshows definite alternating jets downstream. In a viscous case, however, the jets become lessdefinite and identical with the above mentioned alternating flows in the far field. Far upstream, there are no disturbances because of the special propagation characteristics of Rossbywaves.View full abstractDownload PDF (938K) -
Toshio YAMAGATA1976 Volume 32 Issue 4 Pages 162-168
Published: August 30, 1976
Released on J-STAGE: June 17, 2011
JOURNAL FREE ACCESSThe problem of reflexion and critical “level” absorption of barotropic nondivergent Rossby waves in a lateral shear flow is considered with a ray tracing method.The results are compared with those of a normal mode approach. Some oceanographicalapplications are suggested.View full abstractDownload PDF (767K) -
Saburo AOKI1976 Volume 32 Issue 4 Pages 169-174
Published: August 30, 1976
Released on J-STAGE: June 17, 2011
JOURNAL FREE ACCESSThe 25 sediment samples collected from the Gulf of Thailand and the South ChinaSea were analyzed for clay mineral investigation. Results showed the presence of 35%montmorillonite, 13% chlorite, 30% illite, and 22% kaolinite in sediments of the Gulf andalso 16% montmorillonite, 21% chlorite, 41% illite, and 22% kaolinite in sediments of the South China Sea. The relatively high concentration of montmorillonite in sediments of the Gulf as compared with that in sediments of the South China Sea may suggest that montmorillonitein these area has been largely derived from soil formation of the bordering landareas of the Gulf, particularly from the northern part of Malay Peninsula. On the contrary, the content of illite in sediments of the South China Sea is higher than that in the Gulf.This mineral appears to have been supplied from Borneo as well as the Mekong Delta.However, chlorite which shows a similar distribution to that of illite in sediments of theGulf and the South China Sea has not indicated Borneo Isl. as a principal source area forchlorite. Greater resemblance in amount of kaolinite in both sediments of the Gulf and theSouth China Sea is due to the prevailing distribution of kaolinite as “low latitude clay mineral” on the bordering land areas. The distribution of clay minerals in sediments of the studyarea appears to be closely related to the soil formation and geology of the adjacent land areas.View full abstractDownload PDF (818K) -
Yasushi KAWAKAMI, Hajime NISHIMURA1976 Volume 32 Issue 4 Pages 175-181
Published: August 30, 1976
Released on J-STAGE: June 17, 2011
JOURNAL FREE ACCESSBenzo (a) pyrene (BP) in the sediment of Osaka Bay were determined. Highconcentration was found at two stations near the mouth of Shin-Yodo and off Kobe respectively (0.98μg g-1. dry mud basis, 1.1μg g-1). The concentration decreases regularly from themouth of the river further into the bay. The other supplemental determination was carriedon the sediment and the seawater of Keihin Canal. Notable BP concentration of 89 fig gm-1 was observed in the sediment beneath the effluent outlet of a gasworks. The BP in thesediment near the ironworks was also considerable, while the BP was relatively less in thesediment beneath the effluent outlet of refineries. These data suggest that coke plants workingin gasworks or ironworks may be the larger sources of BP than refineries. The results of Osaka Bay coincide with this hypothesis.
Cadmium, lead, copper, zinc, nickel, ignition loss and fine sand content were measuredfrom the same sediment samples of Osaka Bay. Cd, Pb, Cu and ignition loss showed theregular distributions which resemble to BP and accordingly, good correlations with BP. Nosignificant correlations were found between BP and Ni, Zn and fine sand content which showedno regular distributions.View full abstractDownload PDF (1010K) -
Toshio YAMAMOTO, Yukiko OTSUKA, Kazuyo UEMURA1976 Volume 32 Issue 4 Pages 182-186
Published: August 30, 1976
Released on J-STAGE: June 17, 2011
JOURNAL FREE ACCESSAnalyses of gallium content were made by the fluorometric method on 57 samplesof seaweeds which were composed of 30 species. As the result of it, the gallium contentwas found ranging from 0.02 to 0.64μg g-1 and the average was 0.14μg g-1 in the driedseaweeds.
Generally, the gallium content in seaweeds had a close relationship to the aluminium andiron contents. The average weight ratio of Ga/Al was 3.8×10-4 and one of Ga/Fe was4.0×10-4 The average Ga/Al weight ratio (3.8×10-4) was very similar to that reported forshallow-water deposits (2.1×10-4), but was definitely lower than that in sea water (1.5×10-2).View full abstractDownload PDF (684K) -
Jotaro MASUZAWA1976 Volume 32 Issue 4 Pages 187-193
Published: August 30, 1976
Released on J-STAGE: June 17, 2011
JOURNAL FREE ACCESSI have been concerned with oceanographic observations made since 1948 by theoceanographic group of the Japan Meteorological Agency. My primary interest has been todescribe physical aspects of the Kuroshio current system and its adjacent regions. Muchefforts have been devoted to observing current and water characteristics of the Kuroshio southof Japan and the Kuroshio extension east of Japan and to describing various kinds of fluctuationsranging from diurnal to seasonal or year-to-year variations. I have also attempted tostudy the equatorial current system particularly in the western Pacific and those characteristicwater-types in the central region of the North Pacific.View full abstractDownload PDF (1546K)
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