2003・2009年9月134°E線上12°Nから30°Nにおける海洋構造

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  • The oceanographic conditions along 134°E from 12°N to 30°N in September, 2003 and 2009
  • The oceanographic conditions along 134 degrees E from 12 degrees N to 30 degrees N in September 2003 and 2009

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The CTD observations were carried out along 134°E from 12°N to 30°N in the northwestern part of the North Pacific inSeptember’s of 2003 and 2009. The surface layers warmer than 27.5℃ were observed from 12°N to 27°N in 2003 and observedfrom 12°N to 22°N in 2009. The present paper aims to comparing the September’s hydrographic conditions for the two years. Thesubtropical Mode Water occupied the subsurface layer between 200m and 400m depths in the region between 18°N and 24°N for2003, while in that between 18°N and 26°N for 2009. The North Equatorial Current, which is identified by the downward slope ofisotherms toward the south, was observed north of 17°N in 2003 while north of 15°N in 2009. The saline water higher than 34.8 psuoccupied the subsurface layer between 100 m and 250 m depths in the almost whole section in 2003, whereas only in the region northof 21°N in 2009. The halocline below the subsurface saline water, was identified between 34.5 psu and 34.7 psu in the entire sectionsfor both the years. The intermediate water fresher than 34.2 psu occupied within the depths from 550 m to 850 m in the regionbetween 18°N and 27°N in 2003, but the depths from 550 m to 750 m in the region between 19°N and 27°N in 2009.

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