All issues
Volume 10 (1954)
- Issue 4 Pages 175-
- Issue 3 Pages 87-
- Issue 2 Pages 49-
- Issue 1 Pages 1-
Volume 10, Issue 4
Displaying 1-4 of 4 articles from this issue
- |<
- <
- 1
- >
- >|
-
Koji HIDAKA1954 Volume 10 Issue 4 Pages 175-188
Published: December 25, 1954
Released on J-STAGE: June 17, 2011
JOURNAL FREE ACCESSDownload PDF (1338K) -
M. AKAGAWA1954 Volume 10 Issue 4 Pages 189-199
Published: December 25, 1954
Released on J-STAGE: June 17, 2011
JOURNAL FREE ACCESSThe investigations on the oceanographical conditions of the Japan Sea have been made already by many authors. The present author discusses also synoptically the general oceanographical states of the North Japan Sea (west off the Tsugaru-Straits) in summer, mainly on water mass. From the investigations the followings are made clear.
(1) The stratification of water masses in the Japan Sea is complicated and is composed of the coastal water, the surface and middle layer water of Tsushima warm current, the intermediate water, the deep and bottom layer water, the surface layer water of Liman cold current, etc.
(2) These, the intermadiate water, the deep and bottom layer water in the Japan Sea, are very different from that of other oceans.
(3) The surface layer water has three branch currents and this fact is important in this sea area.
(4) Water masses diffuse and are modified by lateral mixing along the Isentropic surface (isopycnal surface).
(5) It is considered that in the Japan Sea, water temperature distribution and vertical stability show the motion of water masses and chlorinity or dissolved oxygen, the origin of water masses.View full abstractDownload PDF (1445K) -
Part 2. Some Notes on the Determination of SilicateR. FUKAI1954 Volume 10 Issue 4 Pages 201-208
Published: December 25, 1954
Released on J-STAGE: June 17, 2011
JOURNAL FREE ACCESSThe Dienert-Wandenbulcke's method for determination of silicate in sea water has critically been studied by means of Beckman's spectrophotometer and the author has obtained some notes bearing upon conditions for photoelectric measurements and the salt effect. The results obtained from simple series of experiments on the preservation of sea water samples have also been reported.View full abstractDownload PDF (771K) -
R. MARUMO, M. KITOU, O. ASAOKA1954 Volume 10 Issue 4 Pages 209-215
Published: December 25, 1954
Released on J-STAGE: June 17, 2011
JOURNAL FREE ACCESSDuring the three years from 1950 to 1952, 427 and 335 plankton samples were collected with Kitahara's quantitative nets (of Hensen type, 22.5 cm in mouth diameter, xx13 of bolting silk) at the Southern (29°N, 135°E) and the Northern Fixed Point (39°N, 153°E), respectively. The follow-ing conclusions were drawn from these researches.
Generally speaking, the plankton organisms are more predominant in quantity at the Northern than at the Southern Point. Namely, on an average, the productivity at the former is 0.2 times as large as that of the latter for blue-green algae, 1.3 for dinoflagellates, 2.3 for diatoms, 2.4 for settling volumes and 2.7 for copepods. But in the seasons of winter and spring the former productivity tends to be rather small, compared with the latter in the said seasons, and especially blue-green algae are scantier throughout the year at the Northern Point.
As the Southern Point is occupied by the Kuroshio water only all the year round, oceanographical elements and the number of individuals in plankton groups there show a monotonous annual variation with a peak. On the contrary, the Northern Point is influenced by both the Kuroshio and Oyashio waters, and the annual variation of oceanographical elements is of either one-or two-peak type. Under these influences plankton groups also have variations of various types, namely, for blue-green algae one-peak type is found, for dinoflagellates, copepods, total animals and settling volumes two-peak type, and for diatoms many-peak type.View full abstractDownload PDF (1118K)
- |<
- <
- 1
- >
- >|