Relation between Planktological and Oceanographical Conditions of a Sea Area East of Kinkazan in Winter

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  • MARUMO Ryuzo
    Oceanographical Section, Central Meteorological Observatory

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  • 冬期金華山沖におけるプランクトン性状と海況
  • トウキキン カザンオキ ニ オケル プランクトン セイジョウ ト カイキョウ

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Abstract

The oceanographical conditions in December in a sea area east of Kinkazan, 38°20'N, 141°30'E, are stated for the three years 1950 to 1952, and the characters of the water masses in the sea are analysed from the investigation of plankton.<BR>Kuroshio Region (observing stations A3, A4, B3, B4, C3 and C4)-A water mass of higher temperature and chlorinity, namely Kuroshio water, appears every year in the sea area from 144° to 145°E and its vicinity. Warm-water diatom species are abundant, and it is noticeable that Trichodesmium Thiebauti, a tropical blue algae, was detected in this water mass alone. The similarity of the paths of the Kuroshio in the past three winters is suggested by the fact that the diatom communities are resembling to each other at the six stations mentioned above.<BR>Oyashio Region (stations A5, A6, A7, B5 and CS)-The Oyashio water of lower temperature and chlorinity exists in the east of 146°E, but the difference of water characters in respect to the years and stations is shown by the remarkable fluctuation of planktological conditions. In general, Chaetoceros decipiens, a north temperate species, is dominant.<BR>Neritic Region (stations B1, B2, C1 and C2)-In the sea area west of 143°E, the water is rich in neritic species, especially in 1952 in Chaetoceros debilis, a typical neritic and cold water species. An enclosed water mass of the temperatures lower than 7°C at the layer of 75-meter depth at st. B2 shows a significant connection with the existence of Chaetoceros atlanticus, a boreal species.

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