Turbulent Mixing and the Formation of an Intermediate Nepheloid Layer Above the Siberian Continental Shelf Break

Turbulent Mixing and the Formation of an Intermediate Nepheloid Layer Above the Siberian Continental Shelf Break
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西伯利亚大陆架断裂上方的湍流混合和中间霞云层的形成

DOI:
10.1029/2021gl092988
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发表时间:
2021
影响因子:
5.2
通讯作者:
Schulz K
Schulz K
中科院分区:
地球科学1区
文献类型:
--
作者:
Schulz K

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中间伞状层(INLs)形成了包括碳在内的颗粒物质的跨坡运输和垂直出口的重要途径。虽然在北冰洋的欧亚盆地已经报道了颗粒沉降通量的中间最大值,但对大陆斜坡上方浑浊INLs的直接观测仍然缺乏。在这项研究中,我们提供了2018年夏季拉普捷夫海大陆斜坡上的INL与增强的水中层湍流耗散率相一致的第一个直接证据。目前的速度数据显示,在一段时间内,下坡流动增强,等压线降低,这表明湍流耗散增强可能是不稳定背风波存在的结果。类似的事件大多发生在无冰期,这表明在未来,偶发性的跨坡颗粒输送的频率会增加。INL和偶发产生机制的发现为在这种快速变化的环境中研究粒子输运动力学提供了新的见解。
Intermediate nepheloid layers (INLs) form important pathways for the cross‐slope transport and vertical export of particulate matter, including carbon. While intermediate maxima in particle settling fluxes have been reported in the Eurasian Basin of the Arctic Ocean, direct observations of turbid INLs above the continental slope are still lacking. In this study, we provide the first direct evidence of an INL, coinciding with enhanced mid‐water turbulent dissipation rates, over the Laptev Sea continental slope in summer 2018. Current velocity data show a period of enhanced downslope flow with depressed isopcynals, suggesting that the enhanced turbulent dissipation is probably the consequence of the presence of an unsteady lee wave. Similar events occur mostly during ice free periods, suggesting an increasing frequency of episodic cross‐slope particle transport in the future. The discovery of the INL and the episodic generation mechanism provide new insights into particle transport dynamics in this rapidly changing environment.
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