Skewed Water Temperature Occurrence Frequency in the Sea off Sanriku, Japan, and Intrusion of the Pure Kuroshio Water |
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| Authors: | Sachiko Oguma Yutaka Nagata |
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| Institution: | (1) Marine Information Research Center, Japan Hydrographic Association, 7-15-4 Ginza, Chuo-ku, Tokyo 104-0061, Japan |
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| Abstract: | Temperature and salinity data obtained by the Iwate Fisheries Technology Center were analyzed for the period 1971–1995. It
was found that occurrence frequency distributions of temperature and salinity are very skewed at depths deeper than 200 m
and that temperature sometimes exceeds m + 5σ (m: mean and σ: standard deviation. If such abnormally high temperatures are
real the 3σ criterion cannot be adopted. Oceanic conditions were surveyed in 1972 and 1979, when temperatures exceeding m
+ 5σ were observed. It was found that the abnormally high temperature (and high salinity) water was the pure Kuroshio Water
introduced into the region due to some special conditions such as abnormal approach of large warm-core ring to the Sanriku
Coast or abnormal northward extension of the Kuroshio along the coast. These events are very rare, occurring only twice in
the 25-year period analyzed, but the abnormally high temperature observed is real.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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| Keywords: | The sea off Sanriku skewed occurrence frequency of water temperature quality control range check intrusion of the Kuroshio Water |
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