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Volume 29 (1973)
- Issue 6 Pages 227-
- Issue 5 Pages 171-
- Issue 4 Pages 131-
- Issue 3 Pages 87-
- Issue 2 Pages 47-
- Issue 1 Pages 1-
Volume 29, Issue 6
Displaying 1-6 of 6 articles from this issue
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Nobuo SUGINOHARA1973 Volume 29 Issue 6 Pages 227-235
Published: December 25, 1973
Released on J-STAGE: June 17, 2011
JOURNAL FREE ACCESSThe steady state wind-driven circulation in an immiscible three-layer ocean bounded only by a meridional east coast and a flat bottom is studied. Particular attention is paid to the occurrence of internal modes of motions in the Sverdrup transports (SVERDRUP, 1947). The thicknesses of the upper two layers are of the same order and are allowed to vary up to the same order as the layer thicknesses themselves. Frictional transfer of momentum across the interfaces and the frictional boundary layer at the east coast are neglected. An eastward flow is obtained in the uppermost layer at lower middle latitudes. Though the particular feature in the wind-stress distribution as revealed by YOSHIDA and KIDOKORO (1967a, 1967b) is not taken into account, the results show good agreement with the observed flow pattern of the Subtropical Countercurrent. Beneath the Subtropical Countercurrent a westward flow is predicted. These flows exhibit an internal mode of motions associated with a subsurface thermal front.View full abstractDownload PDF (1500K) -
Nobuo SUGINOHARA1973 Volume 29 Issue 6 Pages 236-250
Published: December 25, 1973
Released on J-STAGE: June 17, 2011
JOURNAL FREE ACCESSEffect of the typhoon passage on the western boundary region of a two-layer ocean with bottom topography is studied. The ocean is initially at rest and is set in motion by a typhoon passing parallel to the west coast. Equations that represent barotropic and baroclinic modes of motions are solved numerically by means of the method of finite differences. Motions of the barotropic mode are assumed to be horizontally non-divergent. In this mode, an elongated vortex is produced by the typhoon and propagates toward the south after passage of the typhoon. Behavior of the vortex may be interpreted as continental shelf waves. It is found that the formation and propagation of continental shelf waves are hardly affected by the density stratification. As for the baroclinic response, the typhoon causes considerable interface displacements along its track. The interface displacements are associated with geostrophic motions and remain for long time, though they are formed on the continental slope. Besides the large scale baroclinic response, internal Kelvin waves are induced along the artificial east wall.View full abstractDownload PDF (7137K) -
Yoshiyuki NOZAKI, Shizuo TSUNOGAI, Masakichi NISHIMURA1973 Volume 29 Issue 6 Pages 251-256
Published: December 25, 1973
Released on J-STAGE: June 17, 2011
JOURNAL FREE ACCESSThis is the first detailed study on the distribution of lead-210 in the Japan Sea water. The content of lead-210 ranged from 9.3±2.1dph/1 in the surface water to 3.4±0.8 dph/1 in the deep water-quite low content as compared to that in the deep water of the North Pacific. Vertical profiles show that the content of lead-210 abruptly decreases below the seasonal thermocline (10-20m in depth) and nearly uniform in the deep water. It is suggested that a significant amount of air-borne lead-210 deposited over the Japan Sea is transported along with the Tsushima Current to the open ocean. The budget of lead-210 is calculated by using a simple box-model and the mean residence time of lead-210 in the Japan Sea is estimated to be 15 yr.View full abstractDownload PDF (912K) -
Selective Transmission of Light in the Ocean Waters and its Relation to Phytoplankton PhotosynthesisSooji SHIMURA, Shun-ei ICHIMURA1973 Volume 29 Issue 6 Pages 257-266
Published: December 25, 1973
Released on J-STAGE: June 17, 2011
JOURNAL FREE ACCESSOccurrence of the depth differences in pigment composition and photosynthetic properties of marine phytoplankton were examined in relation to the spectral changes of light with depth. Phytoplankton were taken from various depths in the northwestern North Pacific, and their absorption spectra were determined with intact cells and in 90% acetone extract. The photosynthetic activities of phytoplankton were concurrently measured under blue, green, red and white light. The difference in absorption spectra for the surface and deeper samples was considerably small, indicating that the prevailing green or blue light in the deeper layers may have little significance for depth-variations of the pigment composition in marine phytoplankton. The depth differentiation in the shape of the light-photosynthesis curve was marked in a well stratified water column but no active response of deeper phytoplankton to green light could be confirmed. The photosynthetic efficiencies of phytoplankton for blue and green light were approximately 105-115 % and 80-90% of white light, respectively, irrespective of sampling depth.View full abstractDownload PDF (1484K) -
Ryuzo MARUMO, Sachiko NAGASAWA1973 Volume 29 Issue 6 Pages 267-275
Published: December 25, 1973
Released on J-STAGE: June 17, 2011
JOURNAL FREE ACCESSPelagic chaetognaths in Sagami Bay and Suruga Bay, Central Japan, were studied. Their community structure was very similar in both of these bays. Four genera and 26 species were identified. In Sagami Bay the habitat segregation by depths was clearly obtained. The population and species number of epipelagic (0-200m) chaetognaths were larger in summer than in winter. The populations of meso-(200-500m) and bathypelagic (500-1, 000m) species were smaller than that of epipelagic ones and fairly stable seasonally.View full abstractDownload PDF (1273K) -
Sanae UNOKI1973 Volume 29 Issue 6 Pages 276-284
Published: December 25, 1973
Released on J-STAGE: June 17, 2011
JOURNAL FREE ACCESSDownload PDF (2246K)
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