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Volume 30 (1974)
- Issue 6 Pages 251-
- Issue 5 Pages 209-
- Issue 4 Pages 157-
- Issue 3 Pages 97-
- Issue 2 Pages 49-
- Issue 1 Pages 1-
Volume 30, Issue 2
Displaying 1-7 of 7 articles from this issue
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Hikomaro MURAKI1974 Volume 30 Issue 2 Pages 49-53
Published: April 30, 1974
Released on J-STAGE: June 17, 2011
JOURNAL FREE ACCESSYOSHIDA (1967) pointed out that the coastal upwelling region may not coincide with the intense longshore wind region and shift poleward. In order to clarify thispoleward shift from the existing data, the monthly mean distributions of the offshore Ekman transport and the coastal upwelling intensity are estimated along the California coast from U. S. Daily Weather Maps and from the CCOFI data in 1949, respectively. The results show that the center of the coastal upwelling region is generally shifted to the north from the position of the maximum offshore Ekman transport. The detailed discussions are given for the case of August 1949 when the shift is seen most clearly.View full abstractDownload PDF (811K) -
Kazunari OGAWA1974 Volume 30 Issue 2 Pages 54-60
Published: April 30, 1974
Released on J-STAGE: June 17, 2011
JOURNAL FREE ACCESSSome experiments were carried out to explain the in situ phenomena that the number of coliform organisms decreased rapidly from estuaries to offshore, and also at deeper layer, and that the appearance of coliform types varied.
In natural seawater, experimental results did not show that Escherichia coli was extinct by self-purification or anti-biosis action of seawater, but it showed that this organism decreased mainly because of their starvation caused by lack of nourishment. Although the decreasing rate of bacterial density was delayed in enriched seawater, addition ofnutrient even at the time of bacterial extinction promoted the appearance of variated form of this bacteria with floc formation.
Flocculation of bacterial cells was influenced by quality and quantity of added nutrients. Temperature was shown to have an effect on the floc formation, but appearance of variated form in flocculated cells of E. coli was not affected by temperature. Flocculated particles of coliform bacteria were adsorbed on suspended particles in seawater and precipitated rapidly. This phenomenon seems to be a cause of the rapid disappearance of coliform bacteria in coastal waters.
In bottom deposits the coliform bacteria probably survive longer as physiologically variated forms when suitable nutrients were supplied.View full abstractDownload PDF (1401K) -
Henry CREW, Noel PLUTCHAK1974 Volume 30 Issue 2 Pages 61-66
Published: April 30, 1974
Released on J-STAGE: June 17, 2011
JOURNAL FREE ACCESSA method for computing and displaying the temporal variation of rotary spectral estimates is described. The method is applied to time series measurements of highly nonstationary winds and currents. The results indicate approximately fortnightly modulation of diurnal wind energy and inertial current energy.View full abstractDownload PDF (1163K) -
On the Vertical Diffusion of Suspended Particles from the Sea BottomMasaaki FUKUDA1974 Volume 30 Issue 2 Pages 67-76
Published: April 30, 1974
Released on J-STAGE: June 17, 2011
JOURNAL FREE ACCESSThe suspended matter in seawater near the bottom is distributed by the effects of sinking and diffusion. The author developed a method of estimation of the vertical eddy diffusivity near the sea bottom and the particle size distribution of bottom sediment, in the case of equilibrium state. This estimation was made by the comparison of measured and computed vertical distribution of beam attenuation. The parameters which were used for the computation were (1) median of the particle size distribution of bottom sediment, assuming that the particle size was a log-normal distribution, and (2) the proportional constant of vertical eddy diffusivity which was proportional to the height from the bottom.
As the suspended matter in seawater contains particles of different sizes, the computation of the diffusion and beam attenuation was made for each particle size, and summarizing the results, the vertical distribution of beam attenuation coefficient was computed.
In order to estimate the beam attenuation in high particle concentration, an equation by which the effect of overlapping of particle shadow in the light beam was eliminated, was used.View full abstractDownload PDF (1396K) -
Ryuzo MARUMO, Osamu ASAOKA1974 Volume 30 Issue 2 Pages 77-85
Published: April 30, 1974
Released on J-STAGE: June 17, 2011
JOURNAL FREE ACCESSThe distribution of pelagic blue-green algae, especially of Trichodesmium thiebautii, was investigated on the basis of the collection of the Hakuho Maru Cruise KH-69-4 along 155°W (50°N-15°S) in the North Pacific Ocean from September to November 1969.
(1) Five species were identified: Trichodesmium thiebautii (most predominant), T. erythraeum, Oscillatoria sp., Katagnymene spiralis and Richelia intracellularis.
(2) T. thiebautii was most abundant in the western North Pacific central water and abundant next to it in the equatorial water, but it did not occur in the subarctic water.
(3) T. thiebautii was ubiquitously distributed in the lower layer of 100-200m in the equatorial water, though not in a large quantity.
(4) T. thiebautii inhabited only the water warmer than 20°. In its main habitat, nitrate and nitrite were almost zero, but ammonia and phosphate were present. There was not found any correlation between its occurrence and the salinity.
(5) Blue-green algae were generally thinly populated in the water rich in diatoms.View full abstractDownload PDF (1408K) -
Suguru OHTA, Makoto OMORI1974 Volume 30 Issue 2 Pages 86-89
Published: April 30, 1974
Released on J-STAGE: June 17, 2011
JOURNAL FREE ACCESSSome behavior of Sergestes lucens by day was observed by underwater camera with an electronic flash. A number of species was snapped at about 2-60m above the steep. continental slope where the bottom ranged between 341 and 437 m depths. They were often, abundant from 3-4 to 10m above the bottom. It suggests that the shrimps scatter widely along the continental slope by day. The maximum concentration of the shrimp was 1.2 individuals/m3. None of the shrimps was found on the bottom, and the majority were swimming in horizontal position.View full abstractDownload PDF (3670K) -
Preliminary ResultKenzo TAKANO1974 Volume 30 Issue 2 Pages 91-95
Published: April 30, 1974
Released on J-STAGE: June 17, 2011
JOURNAL FREE ACCESSA current measurement by four Savonius current meters is done for a little longer than eight days in the north-western Pacific. The result of a preliminary analysis of the records is described. Periods around twenty-four hours are dominant. The energy spectra match the -5/3 law for the frequency range up to the diurnal frequency.View full abstractDownload PDF (638K)
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