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The resistance of recent marine carbonate sediments to solution
Oceanographic Abstracts
599
ISAAC.S J. D., 1964. Night-caught and day-caught larvae of the California sardine. Science, 144 (3622): 1132-1133. Some 70,000 larvae of the California sardine, collected from about I0,000 plankton hauls over the years 1950 to 1957, have been sorted by lengths and enumerated. The numbers of the day-caught larvae are very closely a numerical measure of the apparent mortality as indicated by the nightcaught larvae. Over a considerable interval of size, the night-caught larvae appear to be representative of the entire larval population, but the day-caught larvae may represent a fraction that is a measure ot~the natural mortality of the population. ITO N., 1964. On the small-scale horizontal diffusion near the coast. J. Oceanogr. Soc.,Japan, 19 (4): 182-189. Several small-scale dye-release experiments were carried out off Tokaimura by Japan Atomic Energy Research Institute and other research institutes. The results showed that the diffusion constant defined in this paper approximately agreed with all the experiments. The horizontal concentration of released material could be estimated, using this constant. The studies may be applicable in the problem of environmental safety around atomic establishments. IVANOV M. M., 1962. Peculiarities of the distribution of the magnetic field in the Red Sea. Geomag. Aeronomy 2(6): 938-940. Abstr. in: Geophys. Abstr., 1964, (205): 149. No. 205-286. This article discusses the magnetic field in the Red Sea on the basis of the results of magnetic observations aboard the research vessel Zarya. The conclusion is drawn that the structure of the sea floor is identical to the structure of the coastal areas, thereby providing good confirmation of the hypothesis that the Red Sea is a graben. JANSEN J. F. and Y. KIrANO, 1963. The resistance of recent marine carbonate sediments to solution. J. Oceanogr. Soc., Japan, 18 (4): 208-219. The factors influencing the resistance of the recent marine carbonate sediments to solution included: (a) properties of sediments--crystal type of calcium carbonate, magnesium co-existing in the crystal structure of calcium carbonate, and particle size : (b) properties ol~solution--pH, chemical composition, and temperature. This report shows the effect of the particle size, the mineralogy and the chemical composition of recent marine carbonate sediments collected on Campeche Bank in the G u l f of Mexico upon their resistance to solution having the ion pairs of sea water and to distilled water.
JAPAN, HAKODATE MARINE OBSERVATORY,1963. Sea ice observation along the Okhotsk coast of HokkaidB from January to April, 1961. Art. 2., Bull. Hakodate Mar. Obs., (10): 49 pp. Aerial, coastal and ship's observations of sea ice in the coastal region of Hokkaid6 from December 1960 to April 1961, were carried out under the joint co-operation of the three governmental agencies, the Defence Agency, the Maritime Safety Agency (the 1st Regional Maritime Safety Headquarters) and the Japan Meteorological Agency (the Sapporo District Meteorological Observatory, the Hakodate Marine Observatory) as in the preceeding year. These observations have contributed greatly to a clarification of the excessive sea ice conditions during this winter and to the improvement of sea-ice forecasting in the southern waters of the Okhotsk Sea. JITTS H. R., 1963. The simulated in situ measurement of oceanic primary production. Aust, J. Mar. Freshwat. Res., 14 (2): 139-147. Simultaneous measurements with two types of incubators were made on replicate samples both in the incubators and in situ in the ocean. Both incubators used sunlight and blue glass filters to simulate light conditions at depths in the ocean. The first gave measurements of column production 1"58 times those in situ. This was due to the fact that at depths greater than 20 m the incubators gave much higher results with no significant relation to those measured in situ. In the second incubator the accuracy of reproduction of oceanic light conditions was improved by reducing reflected light and using a balance-by-depth twin photometer system for determining the depths of sampling. The measurements of column production in the second incubator were 1.03 times the in situ values. JOHANNES R. E., 1964. Phosphorus excretion and body size in marine animals : microzooplankton and nutrient regeneration. Science, 146 (3646): 923-924. In marine animals the rate of excretion of dissolved phosphorus per unit weight increases as body weight decreases. As a consequence microzooplankton may play a major role in planktonic nutrient regeneration. KAJIURA K., 1963. The leading wave of a tsunami. Bull. Earthquake Res. Inst., 41 (3): 535-571. Based on the linear theory, the decay with distance of the first wave of a tsunami in an infinite sea of constant depth is discussed generally. In particular, for the case of a uniform source distributed
599
ISAAC.S J. D., 1964. Night-caught and day-caught larvae of the California sardine. Science, 144 (3622): 1132-1133. Some 70,000 larvae of the California sardine, collected from about I0,000 plankton hauls over the years 1950 to 1957, have been sorted by lengths and enumerated. The numbers of the day-caught larvae are very closely a numerical measure of the apparent mortality as indicated by the nightcaught larvae. Over a considerable interval of size, the night-caught larvae appear to be representative of the entire larval population, but the day-caught larvae may represent a fraction that is a measure ot~the natural mortality of the population. ITO N., 1964. On the small-scale horizontal diffusion near the coast. J. Oceanogr. Soc.,Japan, 19 (4): 182-189. Several small-scale dye-release experiments were carried out off Tokaimura by Japan Atomic Energy Research Institute and other research institutes. The results showed that the diffusion constant defined in this paper approximately agreed with all the experiments. The horizontal concentration of released material could be estimated, using this constant. The studies may be applicable in the problem of environmental safety around atomic establishments. IVANOV M. M., 1962. Peculiarities of the distribution of the magnetic field in the Red Sea. Geomag. Aeronomy 2(6): 938-940. Abstr. in: Geophys. Abstr., 1964, (205): 149. No. 205-286. This article discusses the magnetic field in the Red Sea on the basis of the results of magnetic observations aboard the research vessel Zarya. The conclusion is drawn that the structure of the sea floor is identical to the structure of the coastal areas, thereby providing good confirmation of the hypothesis that the Red Sea is a graben. JANSEN J. F. and Y. KIrANO, 1963. The resistance of recent marine carbonate sediments to solution. J. Oceanogr. Soc., Japan, 18 (4): 208-219. The factors influencing the resistance of the recent marine carbonate sediments to solution included: (a) properties of sediments--crystal type of calcium carbonate, magnesium co-existing in the crystal structure of calcium carbonate, and particle size : (b) properties ol~solution--pH, chemical composition, and temperature. This report shows the effect of the particle size, the mineralogy and the chemical composition of recent marine carbonate sediments collected on Campeche Bank in the G u l f of Mexico upon their resistance to solution having the ion pairs of sea water and to distilled water.
JAPAN, HAKODATE MARINE OBSERVATORY,1963. Sea ice observation along the Okhotsk coast of HokkaidB from January to April, 1961. Art. 2., Bull. Hakodate Mar. Obs., (10): 49 pp. Aerial, coastal and ship's observations of sea ice in the coastal region of Hokkaid6 from December 1960 to April 1961, were carried out under the joint co-operation of the three governmental agencies, the Defence Agency, the Maritime Safety Agency (the 1st Regional Maritime Safety Headquarters) and the Japan Meteorological Agency (the Sapporo District Meteorological Observatory, the Hakodate Marine Observatory) as in the preceeding year. These observations have contributed greatly to a clarification of the excessive sea ice conditions during this winter and to the improvement of sea-ice forecasting in the southern waters of the Okhotsk Sea. JITTS H. R., 1963. The simulated in situ measurement of oceanic primary production. Aust, J. Mar. Freshwat. Res., 14 (2): 139-147. Simultaneous measurements with two types of incubators were made on replicate samples both in the incubators and in situ in the ocean. Both incubators used sunlight and blue glass filters to simulate light conditions at depths in the ocean. The first gave measurements of column production 1"58 times those in situ. This was due to the fact that at depths greater than 20 m the incubators gave much higher results with no significant relation to those measured in situ. In the second incubator the accuracy of reproduction of oceanic light conditions was improved by reducing reflected light and using a balance-by-depth twin photometer system for determining the depths of sampling. The measurements of column production in the second incubator were 1.03 times the in situ values. JOHANNES R. E., 1964. Phosphorus excretion and body size in marine animals : microzooplankton and nutrient regeneration. Science, 146 (3646): 923-924. In marine animals the rate of excretion of dissolved phosphorus per unit weight increases as body weight decreases. As a consequence microzooplankton may play a major role in planktonic nutrient regeneration. KAJIURA K., 1963. The leading wave of a tsunami. Bull. Earthquake Res. Inst., 41 (3): 535-571. Based on the linear theory, the decay with distance of the first wave of a tsunami in an infinite sea of constant depth is discussed generally. In particular, for the case of a uniform source distributed