Continental slope and outer continental shelf off Zyõban

Continental slope and outer continental shelf off Zyõban

560 Oceanographic Abstracts IWABUXl Y. 1962. Continental slope and outer continental shelf off Zy6ban. Hydrogr. Bull. Tokyo, (Publ. No. 981), 70: 33...

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560

Oceanographic Abstracts

IWABUXl Y. 1962. Continental slope and outer continental shelf off Zy6ban. Hydrogr. Bull. Tokyo, (Publ. No. 981), 70: 33-38. Recent soundings off ZyOban made by the surveying ship Meiyo in October, 1959 show for the first time the submarine topography of this area in detail. At the same time twenty bottom sediment samples were collected on the edge of continental shelf and slope. This area consists of two terraces on the continental shelf and the upper part of continental slope. The slope break of the shelf edge is 150 to 200 metres deep. The collected sediment samples resemble each other in general, and are called as silty sand or fine sand. The studies of this area are still continued, so this paper is presented as preliminary report. J~-',IN A. C. 1961. G6rtler's new series method for steady laminar boundary layer flows with suction. Proc. Nat. Inst. Sci. India, 27 (4): 331-340. Recently, GORTLER gave an important method to solve the problem of boundary layer flows with suction. The method is generalized to include a wider class of suction velocity distribution. A number of cases, treated by other workers, follow as particular cases. The aim is achieved by splitting the stream function F(~:, 7) into two parts, the first part satisfies the boundary conditions corresponding to no suction and the second part satisfies the boundary conditions corresponding to suction. Then, the stream function is resolved into univeral functions, giving rise to no such diffi.culty as experienced by GORTLER. In particular, the zeroth order approximation is free front suction parameter.

JAPAN, HAKODATE MARINE OBSERVATORY 1961. Sea in conditions of 1959 based on air reconnaissance. Bull. Hakodate Mar. Obs. (8): 1-15. From January to April 1959, air reconnaissance of the sea ice for the said area was carried out. This was the third year of the similar observation. This year, in addition to the Cessna and LM planes used in the former observations, jet planes of the Air Self Defence Force participated the reconnaissance. Consquently, observations from very high altitude were carried out and very wide coverage of the sea-ice field was attained. Using these available observational data, the sea ice forecasting became more dependable. Characteristic features of the sea ice of this winter could be summarized as follo~vs :(I) Intensity of sea-ice of 1959 was very weak as compared with the conditions of the preceeding three years. (2) Most of the drifting ice moving down off the Okhotsk coast of Hokktddo arc cGnsidered to come down from the east coast offing of the Sakhalin waters. (3) By the middle of February the drift ice consisted mainly with the ice-cakes and small ice-floes. However, after that period, there appeared the group of large ice-floes and huge ice-floes. The ice form also is completely changed. JAPAN, HAKODATE MARINE OBSERVATORY 1961. Report of the oceanographic observations in the Tsugaru Straits in the period front 1943 to 1958. Bull. Hakodate Mar. Obs. (8): 1-62. Since April 1943, the staff members of Hakodate Marine Observatory have engaged in the oceanographic observation in the Tsugaru Straits on board of the Aomori-Hakodate ferryboat. In the period from 1943 to 1946, the observation was carried on once a month and since January 1947 it has been carried on once every ten days. In the observation, temperature, chlorinity, nutrient salt and microplankton in the surface water were measured. On the basis of the data, the regional, annual and inter-annual variations of the oceanographical elements ~ere clarified. Particularly, the variation in strength of the east~.ard flowing warm current in the straits was examined. Moreover, the relation between the surface temperature in the straits and the temperature as well as the transport of the Tsugaru warm current in the sea eastward off the straits was found. In addition, the seasonal distribution of microplankton, the relation bet,seen the oceanograpbic condition and the drifting of the submarine mines, and the relation between the oceanographic conditions and the fishery of sagittated calamary were discussed.

JAPAN, HAKODATE MARlbil- OBSERVATORY 1961. Sea ice conditions of 1959 based on the coastal observations. Bull. Hakodate Mar. Obs. (8): 1628. The coastal sea ice observation along the coast of Hokkaido has a long historical background. Way back in 1892, the Abashiri Meteorological Station initiated the sea ice observation at the coast. Since then, number of observation station has been increased year after year. Currently, the sea ice observation network consists of the branch stations of JMA and the Maritime Safety Board. Information on sea ice conditions, studies of the sea ice, and the statistics of various elements are necessary for our routine work. In order to get more exact information on drift ice and to study relationship between coastal and offing ice conditions, it is necessary to set up dense and wide network of sea ice observations. Special features of this winter are the weakness of the sea ice condition. This is obvious from the so-called influential days, period, amount, and quality of the sea ice. Distribution pattern of the sea ice was the normal-year type, but showed maximum intensity for the February pattern. These features were applicable both for the coastal ice and the drift ice.