Isotopic tracers for water masses in the coastal region of eastern Hokkaido
Isotopic tracers for water masses in the coastal region of eastern Hokkaido
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DOI：
10.1007/s10872-008-0044-y
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发表时间：
2008-08-01
影响因子：
2.3
通讯作者：
Azumaya, Tomonori
中科院分区：
文献类型：
--
作者：
Oguma, Sachiko;Ono, Tsuneo;Azumaya, Tomonori
在这项研究中，我们使用了两个稳定同位素，三角洲(13)C和三角洲(18)C，用于北海道东部沿海地区的水团分类。经生物效应校正的Delta(13)C*值和深达300m的Delta(18)C值表明，鄂霍次克海南部、Nemuro海峡和北太平洋西部的陆上和近海水的同位素特征可以通过三种源水的混合来解释：Oyashio水(OYW)、大豆暖流水(SWCW)和东库页岛流水(ESCW)。在夏季，Delta(13)C~*-Delta(18)C表明，鄂霍次克海南部的SWCW与北海道东南部太平洋沿岸的OYW之间存在混合，而岸水的温盐度曲线与近海OYW的差异很小。冬季，太平洋沿岸出现ESCW和OYW(或SWCW)混合水，呈冷态、低盐度岸水分布。最后，以三角洲(13)C*和三角洲(18)C的平均值为端元，估算了西北太平洋沿岸OYW、SWCW和ESCW的混合比。这些结果表明，在从鄂霍次克海南部到北太平洋西部的途中，水团组合的季节和年度变化。
In this study we used two stable isotopes, delta(13)C and delta(18)C, for water mass classification in the coastal region off eastern Hokkaido. delta(13)C* values, which were corrected for the biological effect, and delta(18)C values up to 300 m depth suggested that the isotopic character of the onshore and offshore water in the southern Okhotsk Sea, the Nemuro Strait and the western North Pacific could be explained by the mixing of three source waters: the Oyashio water (OYW), Soya Warm Current water (SWCW) and East Sakhalin Current water (ESCW). In summer, delta(13)C*-delta(18)C plots indicated mixing between SWCW from the southern Okhotsk Sea and OYW in the Pacific coast of southeastern Hokkaido, while temperature-salinity plots of the onshore water showed minimal difference from the offshore OYW. In winter, on the other hand, the mixed water of ESCW and OYW (or SWCW) appeared in the Pacific coastal region, distributed as cold, low salinity onshore water. Finally, we estimated mixing ratios of OYW, SWCW and ESCW in the coastal region of western North Pacific using their mean values of delta(13)C* and delta(18)C as endmembers. These results suggest seasonal and yearly changes of water mass combination en route from the southern Okhotsk Sea to the western North Pacific.