Impact of remotely generated eddies on plume dispersion at abyssal mining sites in the Pacific.
Impact of remotely generated eddies on plume dispersion at abyssal mining sites in the Pacific.
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DOI：
10.1038/s41598-017-16912-2
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发表时间：
2017-12-05
影响因子：
4.6
通讯作者：
Vink A
中科院分区：
文献类型：
--
作者：
Aleynik D;Inall ME;Dale A;Vink A
拟议在热带太平洋中部开采多金属结核将产生悬浮沉积物羽流，预计对生态有害。虽然深海的能量低，但它也可能是高度湍流的，因为抑制湍流的垂直密度梯度很弱。由于缺乏现场观测，预测深羽影响的能力受到限制。我们的观测结果表明，地表以下4公里多的低能环境最终会在数周的时间内因中尺度涡旋的通过而变得更有活力。这些漩涡的来源在时间和空间上都很遥远，在这里被确定为中美洲间隙风。深海海流的变化受潮汐、表面风和经过的涡流的可比贡献的控制。在涡流引起的流量升高期间，与采矿有关的羽流可能会得到自然沉积物再悬浮的补充，预计将更广泛和更迅速地扩散和分散。对影响的时间、地点和规模作出了预测。
Proposed harvesting of polymetallic nodules in the Central Tropical Pacific will generate plumes of suspended sediment which are anticipated to be ecologically harmful. While the deep sea is low in energy, it also can be highly turbulent, since the vertical density gradient which suppresses turbulence is weak. The ability to predict the impact of deep plumes is limited by scarcity of in-situ observations. Our observations show that the low-energy environment more than four kilometres below the surface ultimately becomes an order of magnitude more energetic for periods of weeks in response to the passage of mesoscale eddies. The source of these eddies is remote in time and space, here identified as the Central American Gap Winds. Abyssal current variability is controlled by comparable contributions from tides, surface winds and passing eddies. During eddy-induced elevated flow periods mining-related plumes, potentially supplemented by natural sediment resuspension, are expected to spread and disperse more widely and rapidly. Predictions are given of the timing, location and scales of impact.
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影响因子：
5.2
作者：
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通讯作者：
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