The Report of Drift Bottles Released in the North Pacific Ocean

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  • 北太平洋における海流瓶の投入結果について
  • キタタイヘイヨウ ニ オケル カイリュウビン ノ トウニュウ ケッカ ニ ツイテ

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Abstract

1. Among the drift bottles released in the North Pacific Ocean since 1932 18 bottles were cast ashore on the western coast of North America and 4 bottles were found on the sea near the continent.<BR>The percentage of the number of the bottles found to those released in 1958 and 1959 was 2%.<BR>2. Among the drift bottles released in the area C 4 bottles were found and 2 were picked up near the Hawaii island. On the other hand it is reported by HOLLISTER (1958) that among the bottles released near the fixed point “PAPA” 816 bottles were found, but was only one cast on the Hawaii island.<BR>3. The surface velocity of the subpolar current between 150° N and 150° W is about 4 nautical miles a day, while the mean velocity of drift of 17 bottles found on the western coast of North America reaches about 4.7 nautical miles a day and is larger by 20% than the surface velocity of the subpolar current. The difference depends chiefly on the drift effect of wind and the indirect one-drift current by wind.<BR>4. The bottles released in the coastal region of the Oyashio, in the offshore region of it, in the mixing region between the Oyashio and Kuroshio, and in the Kuroshio region were found on the northern coast of Japan proper, on the coasts of Alaska and Canada, on the coast of U. S. A. from 40° to 50° N, and on the sea south of 40° N, respectively.<BR>This shows that the water masses in which the bottles were released decide their destinations.<BR>5. Among the bottles released in Japan Sea most parts were found on the coast of the Japan Islands 2 bottles were cast on the coasts of Alaska and Washington State, U. S. A., and on the Pacific (25° N, 175° W).<BR>6. From the above mentioned it is imaginable that the northern limit of the surface water of the Oyashio flowing southwards in spring and summer is near the strait of Kita-urupu.

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