Using thermohaline curves, the water-mass composition of Japan Sea was discussed about the results of the simultaneous investigations held in spring and summer 1949; and the following facts were ascertained.
(i) There exist four main water massed which construct Japan Sea, i.e. (a) surface warm water, (b) subsurface warm water, (c) surface cold water, and (d) proper cold water in underlayer.
(ii) Comparing the seasonal change of surface and subsurface water in the. eastern part of Japan Sea with that of western part, a remarkable differ-once is recognized, while, in proper cold water, only slight change is found.
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