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首页> 外文期刊>Journal of oceanography >Seasonal Change of Oceanographic Conditions and Chlorophyll a Vertical Distribution in the Southwestern Okhotsk Sea during the Non-Iced Season
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Seasonal Change of Oceanographic Conditions and Chlorophyll a Vertical Distribution in the Southwestern Okhotsk Sea during the Non-Iced Season

机译：非冰季西南鄂霍次克海海洋条件的季节变化和叶绿素垂直分布

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摘要

Seasonal changes in oceanographic conditions related to primary productivity was investigated in the southwestern Okhotsk Sea during non-iced seasons, using the observation data conducted in 2000～2006. Based on hydrographic characteristics, the studied area could be classified into two regions, the Coastal Region which is influenced under the Soya Warm Current and the Forerunner Water of the Soya Warm Current, and the Offshore Region where the Intermediate Cold Water was located in the subsurface layer. This study is the first report on seasonal change of nutrient and chlorophyll a concentrations in the offshore region of the southwestern Okhotsk Sea. Variability of concentrations of chlorophyll a and nutrients is temporally and regionally high in the Coastal Region. The maximum chlorophyll a concentration in April was observed at the surface layer of both regions. The most remarkable feature on the vertical structure in the Offshore Region was the consistent existence of the Intermediate Cold Water and the development of seasonal thermocline in the subsurface layer during summer and autumn. The stratification formed within the euphotic zone in the Offshore Region resulted in the formation of the subsurface chlorophyll a maximum (SCM) from May to October. Throughout the research period, although less amplitude of nutrients at the surface was observed in the Coastal Region than that in the Offshore Region, comparable amplitude of chlorophyll a concentration was observed between regions. These results suggested differences of environmental conditions for primary production between the two regions. Depending on the presence of SCM, relationships between chlorophyll a concentration at the sea surface and chlorophyll a standing stock within the euphotic layer were different. At most stations with SCM, the surface chlorophyll a concentration was lower than 0.6 mg m~(-3). This suggests that the presence of SCM and the chlorophyll a standing stock within the euphotic layer may be estimated using the surface chlorophyll a concentration from spring to autumn in the studied area.
机译：利用2000〜2006年的观测数据，对鄂霍次克州西南部非结冰季节的海洋条件与初级生产力的季节性变化进行了调查。根据水文特征，可将研究区域分为两个区域，即受大豆暖流和大豆暖流先驱水影响的沿海地区，以及位于地下的中冷水的近海地区。层。这项研究是关于鄂霍次克海西南部近海地区养分和叶绿素a浓度季节性变化的第一份报告。在沿海地区，叶绿素a和养分浓度的变化在时间和区域上都很高。在两个区域的表层均观察到4月的最大叶绿素a浓度。近海垂直结构最显着的特征是中冷水的持续存在以及夏季和秋季在地下层的季节性温跃层的发展。在近海地区的富营养区内形成的分层导致从5月到10月形成了地下最大叶绿素（SCM）。在整个研究期间，尽管沿海地区的表层养分振幅低于近海地区，但区域之间的叶绿素a浓度却相当。这些结果表明两个地区之间初级生产的环境条件不同。根据SCM的存在，海面叶绿素a浓度与富营养层内叶绿素a立足量之间的关系不同。在大多数带有SCM的站点，其表面叶绿素a浓度低于0.6 mg m〜（-3）。这表明，可以使用研究区域春季至秋季的表面叶绿素a浓度来估算常绿层中SCM和叶绿素a常规存量的存在。

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  • 来源
    《Journal of oceanography》 |2010年第1期|13-26|共14页
  • 作者

    Hiromi Kasai; Yoshiyuki Nakano; Tsuneo Ono; Atsushi Tsuda;

  • 作者单位

    Hokkaido National Fisheries Research Institute, Fisheries Research Agency, Katsurakoi, Kushiro, Hokkaido 085-0802, Japan;

    Marine Technology Center, Japan Agency for Marine-Earth Science and Technology, Natsushima-cho, Yokosuka, Kanagawa 237-0061, Japan;

    Hokkaido National Fisheries Research Institute, Fisheries Research Agency, Katsurakoi, Kushiro, Hokkaido 085-0802, Japan;

    Ocean Research Institute, The University of Tokyo, Minamidai, Nakano-ku, Tokyo 164-8639, Japan;

  • 收录信息 美国《科学引文索引》(SCI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    okhotsk sea; chlorophyll a; subsurface chlorophyll a maximum; intermediate cold water; soya warm current;

    机译：鄂霍次克海;叶绿素a;地下叶绿素最大;中冷水;大豆暖流;

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