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首页> 外文期刊>Polar biology >Production and retention of biogenic matter in the southeast Beaufort Sea during 2003-2004: insights from annual vertical particle fluxes of organic carbon and biogenic silica
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Production and retention of biogenic matter in the southeast Beaufort Sea during 2003-2004: insights from annual vertical particle fluxes of organic carbon and biogenic silica

机译：2003年至2004年东南波弗特海的生物源物质的生产和保留：有机碳和生物硅的年度垂直颗粒通量的见解

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摘要

Regional variability in the annual fluxes of particulate organic carbon (POC) and biogenic silica (Si) at the periphery of the Mackenzie Shelf (Beaufort Sea) was investigated using eight long-term sediment traps moored at ~ 100-m depth. Relatively high autochthonous POC and Si fluxes were recorded in the Mackenzie Trough (4.1 and 8.9 g m~(-2) year~(-1) respectively) and off Cape Bathurst (6.6 and 79 g m~(-2) year~(-1)), two areas where upwelling events are frequently observed. Diatomaceous new production was minimum on the mid-slope of the Mackenzie Shelf (2.8 g C m~(-2) year~(-1)), moderate in the Mackenzie Trough (14.5 g C m~(-2) year~(-1)), and highest off Cape Bathurst (128.7 g C m~(-2) year~(-1)). High annual autochthonous POC flux corresponded to high diatom production. Among sites, the vertical attenuation of the POC flux increased with diatomaceous new production. Hence, the retention of autochthonous POC in the surface layer (<100 m) was highest (95%) at the highly productive site off Cape Bathurst, intermediate (72%) in the moderately productive Mackenzie Trough, and low (4%) at the unproductive mid-slope of the shelf. Our results indicate that, on Arctic shelves, upwelling and the production of diatoms increase the fraction of the POC which is retained in the surface layer and diverted to the pelagic food web. In the relatively unproductive waters of the Arctic Ocean, biological hot spots such as the one identified off Cape Bathurst where the food web promotes retention rather than vertical export could be disproportionately important as feeding grounds for higher trophic levels.
机译：使用八个系泊在〜100 m深度的长期沉积物陷阱，研究了Mackenzie架（博福特海）外围的颗粒有机碳（POC）和生物硅（Si）的年通量的区域变化。在Mackenzie槽（分别为4.1和8.9 gm〜（-2）年〜（-1））和巴瑟斯特角附近（6.6和79 gm〜（-2）年〜（-1）记录到相对较高的本地POC和Si通量。 ）），这两个区域经常发生上升流事件。在Mackenzie层架的中坡（2.8 g C m〜（-2）年〜（-1））的硅藻新产量最低，在Mackenzie槽（14.5 g C m〜（-2）年〜）中等。 -1）），最高的是巴瑟斯特角（128.7 g C m〜（-2）年〜（-1））。每年高的本地POC通量对应于高硅藻产量。在地点之间，POC通量的垂直衰减随着硅藻类新产品的增加而增加。因此，在巴瑟斯特角附近高产地，表层（<100 m）的自生POC保留最高（95％），在中等产量的麦肯齐海槽中中等（72％），而在低产（4％）架子无用的中坡。我们的结果表明，在北极大陆架上，上升流和硅藻的产生增加了保留在表层并转移到中上层食物网中的POC的比例。在北冰洋相对低产的水域中，诸如巴瑟斯特角（Cape Bathurst）沿岸发现的生物热点，即食物网促进保留而不是垂直出口的生物热点，可能作为营养水平较高的觅食场而显得格外重要。

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  • 来源
    《Polar biology》 |2011年第4期|p.501-511|共11页
  • 作者

    Makoto Sampei; Hiroshi Sasaki; Ryosuke Makabe; Alexandra Forest; Hiroshi Hattori; Jean-Eric Tremblay; Yves Gratton; Mitsuo Fukuchi; Louis Fortier;

  • 作者单位

    Quebec-Ocean, Departement de Biologie,Universite Laval, Quebec, QC G1V0A6, Canada;

    Senshu University of Ishinomaki, Ishinomaki,Miyagi 986-8580, Japan;

    Senshu University of Ishinomaki, Ishinomaki,Miyagi 986-8580, Japan,Hiroshima University, Higashihiroshima,Hiroshima 739-8528, Japan;

    Quebec-Ocean, Departement de Biologie,Universite Laval, Quebec, QC G1V0A6, Canada,Institut national de la recherche scientifique Centre Eau,Terre & Environnement, Quebec, QC G1K9A9, Canada;

    Tokai University, Minamisawa, Minamiku,Sapporo, Hokkaido 005-8601, Japan;

    Quebec-Ocean, Departement de Biologie,Universite Laval, Quebec, QC G1V0A6, Canada;

    Institut national de la recherche scientifique Centre Eau,Terre & Environnement, Quebec, QC G1K9A9, Canada;

    National Institute of Polar Research,Tachikawa, Tokyo 190-8518, Japan;

    Quebec-Ocean, Departement de Biologie,Universite Laval, Quebec, QC G1V0A6, Canada;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    POC flux; Biogenic Si flux; Diatom production; POC retention; Mackenzie Shelf; Arctic;

    机译：POC流量;生物硅通量;硅藻生产;POC保留;麦肯齐货架;北极;

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