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Volume 37 (1981)
- Issue 6 Pages 300-
- Issue 5 Pages 227-
- Issue 4 Pages 149-
- Issue 3 Pages 101-
- Issue 2 Pages 61-
- Issue 1 Pages 1-
Volume 37, Issue 3
Displaying 1-5 of 5 articles from this issue
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Kazuo ISEKI1981 Volume 37 Issue 3 Pages 101-105,107
Published: September 30, 1981
Released on J-STAGE: June 17, 2011
JOURNAL FREE ACCESSSediment trap arrays were deployed at two deep ocean stations, one in the Bering Sea and the other in the Gulf of Alaska, in the summer of 1975. The sediment trap was constructed of a pair of polyethylene cylinders (0.185 m' opening) with funnel-shaped bases. The trap is equipped with a lid which is closed before recovery by a tripping messenger system triggered by an electric time release. 37-68 % of the total organic carbon fluxes (37-38% in the Bering Sea; 48-68% in the Gulf of Alaska) were represented by large particles (67 μm<) such as fecal matter and fecal pellets which contributed minor fractions to the total particulate organic matter concentration in sea water. The total fluxes were 11.1 and 14.2mg Cm-2 d-1 at 1, 510 and 2, 610m respectively at the station (3, 800m) in the Bering Sea, and were 7.60, 4.66 and 3.27mg Cm-2 d-1 at 900, 1, 500 and 1, 875m respectively at the station (4, 150m) in the Gulf of Alaska. The former values are several times greater than the latter, suggesting that there is a regional variation in the vertical carbon flux in deep layers. The fluxes were approximately equivalent to 1 to 3% of primary productivity in the overlying surface layers. These observations suggest that deep-water ecosystems may be influenced by relatively rapid sinking of large particles such as fecal matter and fecal pellets from near surface production.View full abstractDownload PDF (4921K) -
Mitsuhiko HATORI, Masayuki TOKUDA, Yoshiaki TOBA1981 Volume 37 Issue 3 Pages 111-119
Published: September 30, 1981
Released on J-STAGE: June 17, 2011
JOURNAL FREE ACCESSThe interaction between mechanically generated regular waves and wind waves is experimentally investigated in a wind-wave tunnel. It is shown that the growth process of regular waves is divided into the four distinct stages as follows:(1) almost independent coexistence of wind waves and regular waves, (2) attenuation of wind waves with simultaneous growth of regular waves, (3) rapid growth of regular waves after disappearance of wind waves, and (4) transition of regular waves to wind waves after the wave breaking. At the second stage there is an apparent relation between the attenuation of wind waves and the growth of regular waves. This fact suggests that there is some strong nonlinear interactions which transfers energy effectively from wind waves to regular waves.View full abstractDownload PDF (1419K) -
Michio J. KISHI, Kisaburo NAKATA, Kimitoshi ISHIKAWA1981 Volume 37 Issue 3 Pages 120-134
Published: September 30, 1981
Released on J-STAGE: June 17, 2011
JOURNAL FREE ACCESSAn ecosystem with four compartments, i. e. PO4-P, phytoplankton, zooplankton and detritus, in a coastal region was considered. Sensitivity analysis of a phosphorus flow model in well-mixed water without currents concludes that (1) the maximal photosynthetic rate, Vm, in Michaelis-Menten relation plays an important role in the distribution of biomass among compartments but the half saturation constant, K8, is not so important, (2) the natural death rate of phytoplankton is important for the ecosystem, (3) the natural death rate of zooplankton is also effective on the ecosystem.
A numerical experiment was also performed on the ecosystem with four compartments are also studied using a dynamical barotropic model of tidal currents of Mikawa Bay (Japan). Diffusion coefficient in diffusion equation plays the role of a linear smoothing parameter in the horizontal distribution of compartment. On the other hand, perturbations of biological parameters cause nonlinear variations in the horizontal distribution of compartment.View full abstractDownload PDF (2146K) -
Yutaka NAGAYA, Kiyoshi NAKAMURA1981 Volume 37 Issue 3 Pages 135-144
Published: September 30, 1981
Released on J-STAGE: June 17, 2011
JOURNAL FREE ACCESS90Sr and 137Cs concentrations and their vertical distributions were determined in deep waters in the western Northwest Pacific, including the adjacent seas of Japan, from 1976 to 1979.
The profiles of the radionuclides show distribution patterns with two parts with an exponential variation of radioisotope content with depth in both parts.
Generally speaking, the inventories of 90Sr and 137Cs in the open waters of the northwestern Pacific correspond fairly well to the fallout inputs, but in some circumstances there seems to be considerable removal of radionuclides from the water column or they are diluted with water of lower radioactivity from other regions.
The possibility of radioisotope remobilization from the bottom sediment or particulate matter is also discussed.View full abstractDownload PDF (1692K) -
Shigeki HIRANO, Taku KOYANAGI1981 Volume 37 Issue 3 Pages 145-147
Published: September 30, 1981
Released on J-STAGE: June 17, 2011
JOURNAL FREE ACCESSStability constants were determined for 60Co (II)-amino acid complexes in sodium perchlorate media at an ionic strength μ=0.67, using cation exchange resins. Stability constants were, for Co (II)-phenylalanine, log β1=4.4, log β2=8.2, log β3=11.7, for Co (II)-histidine, log β1=7.4. for Co (II)-valine, logβ1=4.3, log β2=8.5, for Co (II)-proline, log β1=4.1, and for Co (II)-tyrosine, logβ1=7.2, respectively. The abundance of Co (II)-amino acid complexes in seawater was calculated from these stability constants on the basis of chemical equilibrium, assuming the concentration of individual amino acid to be 10-7 to 10-9 mol-1. It was inferred that the Co (II)-amino acid complexes are probably not formed abundantly in seawater while inorganic species of 60Co (II) may still be dominant for a short period of time after discharge into seawater as liquid waste.View full abstractDownload PDF (518K)
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