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首页> 外文期刊>Journal of oceanography >Development of a thin diatom layer observed in a stratified embayment in Japan
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Development of a thin diatom layer observed in a stratified embayment in Japan

机译：在日本的分层巢中观察到硅藻薄层的发展

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摘要

The temporal evolution of a thin phytoplankton layer was observed by field measurements using a research vessel and mooring instruments in the Yatsushiro Sea, a semi-enclosed narrow embayment in Japan, in early August 2013. The subsurface chlorophyll maximum developed into a thin layer within 2 days just below the pycnocline at around 10-m depth, where turbulent mixing (the dissipation rate of turbulent kinetic energy) was weak (low). The layer persisted for 1.5 to 2 days and declined after irradiance drastically decreased at the sea surface. At the peak period, the layer thickness, which is defined as the full-width at half-maximum of the peak in chlorophyll a concentration, ranged from 0.6 to 1.4 m, and the maximum concentration reached 42.3 mg m(-3). The horizontal extent of the layer was approximately 10 km along the longitudinal axis of the bay. The phytoplankton population characterized by the layer was dominated by a chain-forming centric diatom, Chaetoceros spp. The formation mechanisms of the thin diatom layer were investigated using the observed data and a vertical one-dimensional model that includes physical and biological processes. The results suggest that the development of the thin layer was caused by in situ growth and aggregation due to nutrient-dependent sinking of the species under weak turbulence. The study highlights that continuous multidisciplinary observations and understanding species-specific physiological responses to environmental variations are necessary to elucidate drastically fluctuating phytoplankton dynamics in a coastal water.
机译：2013年8月上旬，在日本半封闭的狭窄小岛八代海，使用研究船和系泊设备通过实地测量观察到了浮游植物薄层的时间演变。地下叶绿素最大值在2内发展为薄层在比浓线以下大约10米深度的几天，那里的湍流混合（湍动能的耗散率）很弱（低）。该层持续了1.5至2天，在海面辐照度急剧下降后下降。在高峰期，层厚定义为叶绿素a浓度峰的最大最大值的一半，范围为0.6到1.4 m，最大浓度达到42.3 mg m（-3）。该层的水平范围沿海湾的纵轴约为10 km。以该层为特征的浮游植物种群以成链的中心硅藻Chaetoceros spp为主。使用观察到的数据和包括物理和生物过程的垂直一维模型研究了薄硅藻层的形成机理。结果表明，薄层的发育是由原位生长和聚集引起的，这是由于在弱湍流下物种的营养依赖性下沉所致。该研究强调，连续的多学科观察和了解物种对环境变化的生理反应对于阐明沿海水域浮游植物的剧烈波动是必要的。

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  • 来源
    《Journal of oceanography》 |2018年第4期|351-365|共15页
  • 作者

    Onitsuka Goh; Yoshikawa Yutaka; Shikata Tomoyuki; Yufu Kei; Abe Kazuo; Tokunaga Takahisa; Kimoto Katsunori; Matsuno Takeshi;

  • 作者单位

    Japan Fisheries Res & Educ Agcy, Natl Res Inst Fisheries & Environm Inland Sea, 2-17-5 Maruishi, Hiroshima, Japan;

    Kyoto Univ, Grad Sch Sci, Sakyo Ku, Kitashirakawa Oiwake Cho, Kyoto 6068502, Japan;

    Japan Fisheries Res & Educ Agcy, Natl Res Inst Fisheries & Environm Inland Sea, 2-17-5 Maruishi, Hiroshima, Japan;

    Kyushu Univ, Appl Mech Res Inst, 6-1 Kasuga Koen, Kasuga, Fukuoka 8168580, Japan;

    Japan Fisheries Res & Educ Agcy, Natl Res Inst Fisheries & Environm Inland Sea, 2-17-5 Maruishi, Hiroshima, Japan;

    Japan Fisheries Res & Educ Agcy, Seikai Natl Fisheries Res Inst, 1551-8 Taira Machi, Nagasaki, Nagasaki 8512213, Japan;

    Japan Fisheries Res & Educ Agcy, Seikai Natl Fisheries Res Inst, 1551-8 Taira Machi, Nagasaki, Nagasaki 8512213, Japan;

    Kyushu Univ, Appl Mech Res Inst, 6-1 Kasuga Koen, Kasuga, Fukuoka 8168580, Japan;

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

    Subsurface chlorophyll maximum; Thin layer; Diatom; Turbulence; Growth; Sinking;

    机译：表层叶绿素最大值;薄层;硅藻;湍流;生长;下沉;

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