Internal tidal mixing as a control on continental margin ecosystems
Internal tidal mixing as a control on continental margin ecosystems
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DOI：
10.1029/2009gl040683
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发表时间：
2009-12
影响因子：
5.2
通讯作者：
J. Sharples;C. Moore;Anna Hickman;P. Holligan;J. F. Tweddle;M. Palmer;J. Simpson
中科院分区：
文献类型：
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作者：
J. Sharples;C. Moore;Anna Hickman;P. Holligan;J. F. Tweddle;M. Palmer;J. Simpson
我们表明，陆架边缘的内潮破裂是对生态系统结构和功能特性的根本控制。陆架和公海之间硝酸盐垂直混合的对比与浮游植物群落的水平和垂直变化相对应，在陆架边缘的表层水中发现了最大的细胞。大陆架边缘经常出现密集的捕捞活动，目标是产卵鱼类种群。我们认为，内潮是陡峭陆架边缘测深中全球普遍存在的物理过程，它通过为首次摄食的鱼类幼虫提供大细胞浮游植物来支持陆架边缘渔业。内潮汐的可重复性使鱼类无需在春季开花时定时产卵。此外，由于大型浮游植物细胞主导颗粒有机碳输出，内潮汐可能对深水和沉积物中全球碳封存模式的时空变化产生重要影响。
We show that a breaking internal tide at a shelf edge is a fundamental control on the structural and functional properties of ecosystems. Contrasts in vertical mixing of nitrate between the shelf and the open ocean correspond with horizontal and vertical changes in phytoplankton communities, with largest cells found in surface waters at the shelf edge. Intense fishing activity is commonly seen at continental shelf edges, targeting spawning fish stocks. We suggest that the internal tide, a globally ubiquitous physical process at steep shelf edge bathymetry, supports shelf edge fisheries by providing large‐celled phytoplankton for first‐feeding fish larvae. The repeatability of the internal tide removes fish from the need to time spawning with a spring bloom. Also, with large phytoplankton cells dominating particulate organic carbon export, the internal tides could be an important influence on spatial and temporal variability in patterns of global carbon sequestration in deep water and sediments.