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Spatial and temporal variability in export fluxes of biogenic matter in Kongsfjorden

机译：Kongsfjorden生物源性物质出口通量的时空变化

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摘要

The marine ecosystem of Kongsfjorden experiences large variations in primary productivity due to pronounced seasonal variations in sunlight, glacier melt, and ice cover. The objective of this study was to assess spatial and seasonal variability in the downward export of biogenic matter in Kongsfjorden. Short-term sediment traps were deployed for periods ranging from 21 to 52 h at three stations from the inner fjord to the outer fjord in May, August, and October 2012 and at one mid-fjord station in January 2013. Total particulate matter, particulate organic carbon, phytoplankton cells, chlorophyll a, biogenic particulate silica, and zooplankton fecal pellet fluxes were measured to determine the magnitude and composition of the material exported in the fjord. The amount and composition of export fluxes reflected a large phytoplankton bloom grazed upon by zooplankton in May, the melting of glaciers and the intrusion of Atlantic Water in August, the end of the glacier melt period in October, and the polar night in January. Overall, seasonal changes in the phytoplankton community impacted export efficiency in the fjord, directly through phytoplankton sinking and indirectly through zooplankton grazing. Results obtained in this study may reflect the magnitude and composition of export fluxes to expect in coming years in Kongsfjorden, especially under conditions of warmer Atlantic Water and longer glacier melt periods.
机译：由于阳光，冰川融化和冰盖的明显季节性变化，Kongsfjorden的海洋生态系统的初级生产力有很大的变化。这项研究的目的是评估Kongsfjorden中生物源物质向下输出的空间和季节变化。在从内峡湾到外峡湾的三个站点（分别于2012年5月，8月和2012年10月）以及在2013年1月的一个中峡站点，部署了短期沉积物诱集装置，时间从21到52小时不等。测量了有机碳，浮游植物细胞，叶绿素a，生物颗粒二氧化硅和浮游动物粪便颗粒通量，以确定在峡湾中输出的物质的大小和组成。出口通量的数量和组成反映了5月浮游动物放牧的大型浮游植物绽放，8月冰川融化和大西洋水入侵，10月冰川融化期结束和1月极夜。总体而言，浮游植物群落的季节性变化直接通过浮游植物下沉而间接地通过浮游动物放牧影响了峡湾的出口效率。这项研究获得的结果可能反映了Kongsfjorden未来几年预期的出口通量的大小和组成，特别是在大西洋水温和冰川融化时间较长的情况下。

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  • 来源
    《Polar biology》 |2016年第10期|1725-1738|共14页
  • 作者

    Lalande Catherine; Moriceau Brivaela; Leynaert Aude; Morata Nathalie;

  • 作者单位

    Univ Laval, Dept Biol, Takuvik Joint Int Lab, 1045 Ave Med, Quebec City, PQ G1V 0A6, Canada|Univ Laval, Dept Biol, Quebec Ocean, 1045 Ave Med, Quebec City, PQ G1V 0A6, Canada;

    IUEM, CNRS IRD UBO Ifremer, Lab Sci Environm MARin LEMAR, UMR 6539, Technopole Brest Iroise,Rue Dumont DUrville, F-29280 Plouzane, France;

    IUEM, CNRS IRD UBO Ifremer, Lab Sci Environm MARin LEMAR, UMR 6539, Technopole Brest Iroise,Rue Dumont DUrville, F-29280 Plouzane, France;

    IUEM, CNRS IRD UBO Ifremer, Lab Sci Environm MARin LEMAR, UMR 6539, Technopole Brest Iroise,Rue Dumont DUrville, F-29280 Plouzane, France|Akvaplan Niva, Fram Ctr Climate & Environm, N-9296 Tromso, Norway;

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  • 正文语种 eng
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  • 关键词

    Export; Biogenic matter; Sediment trap; Arctic; Spitsbergen; Kongsfjorden;

    机译：出口;生物物质;沉积物陷阱;北极;Spitsbergen;Kongsfjorden;

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