Abstract
The present w ?? iter's seria' observations done several times a day at a station, 28m. deep and located near the keddle net (i.e., a sort of the guiding barrier) of Awasima Isle at the north-eastern end of Suruga Bay, spread over three periods, viz., April 27 to June 13, July 21 to August 1, and September 23 to October 10, 1931. The results may be summarised as follows:- 1) Specific gravity, transparency, and density of plankton fall but SiO2 content rises in the surface layer when the tida lcurrent brings water-mass from the mouth of the Kano River to this station. 2) In the bottom layer, temperature of water decreases but specific gravity and SiO2 content increase owing to upwelling of water-mass from below in consequence of tidal movement. 3) The flowing of water from the mouth of the Kano River to the upper layer at this station and the upwelling of the water-mass from below here take place alternately. 4) Such conditions of the sea as closely related to the tidal movement change with the same period as that of the tide, the maxima or minima appearing fortnightly besides diurnal and semi-diurnal fluctuations. 5) A heavy rain or a strong wind results to make considerable changes at the station by bringing an enormous amount of extremely turbid water from the Kano River to this place. Fragmentary as they are, the writer's observations made on June 7, 1931, in northern part of the bay appear to be worthy of record and may be briefly given in the following lines. 1) SiO2 content and specific gravity in the surface layer stand in close relation with each other, as is the case with the two variables in the corresponding layer at the station near Awasima Isle. 2) The surface layer of north-western part of the bay contains a very large amount of P2O5, its maximum value being found at the mouth of the Huzi River. 3) The 50m.- layer of northern part of the bay is remarkably rich in P2O5 content with its mean value about 120mg/m3, whereas the corresponding layers of the Tôkyô and Sagami Bays contain 30-50mg/m3 of the same. 4) The conditions of plankton sharply separate the northern coast of the bay from the coast of Nisiura which is situated just west to Awasima Isle. The plankton organisms along the former are mostly composed of zoöplankton and peridinians but are not densely populated. However, the diatoms lead the list along the latter and their density is very high.
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