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首页> 外文期刊>Ocean Dynamics >Internal-wave-induced and double-diffusive nutrient fluxes to the nutrient-consuming surface layer in the oligotrophic subtropical North Atlantic
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Internal-wave-induced and double-diffusive nutrient fluxes to the nutrient-consuming surface layer in the oligotrophic subtropical North Atlantic

机译：内部波引起的营养物质通量的双重扩散和养分流向北亚热带贫营养亚热带

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摘要

In the literature, an inconsistency exists between estimates of biotically-effected carbon export inferred from large-scale geochemical studies (Jenkins 1982; 47 gC m~(-2) a~(–1)) and local measurements of turbulent nutrient supply (Lewis et al. 1986; 4 gC m~(-2) a~(–1)) in the eastern subtropical North Atlantic. Nutrient supply to the upper ocean by turbulent mixing is reexamined using local standard oceanographic measurements and high-resolution vertical profiles of nutrients averaged over a large region directly comparable to that investigated by Jenkins (1982). Turbulent fluxes induced by internal waves and salt fingering, respectively, are separated according to Gregg (1989) and Zhang et al. (1998). Nutrient transport into the nutrient-consuming surface layer by salt fingering is more than fivefold higher than transport due to internal-wave induced turbulence. Still, this cannot resolve the above-mentioned apparent inconsistency, even if additional physical transport mechanisms such as eddy pumping, advection and horizontal diffusion are accounted for. Estimated nitrate fluxes due to vertical turbulent diffusion are 0.05-0.15 mol m~(-2) a~(-1), corresponding to 4-11 gC m~(-2) a~(-1). Observed NO3/PO4 turbulent flux ratios of up to 23 are interpreted as the imprint of N2 fixation.
机译：在文献中，从大规模地球化学研究（Jenkins 1982； 47 gC m〜（-2）a〜（–1））推断出的生物影响碳出口的估计值与湍流养分供应的局部测量值（刘易斯）之间存在不一致的地方。 et al。1986;东亚热带北大西洋4 gC m〜（-2）a〜（–1））。使用当地标准海洋学测量和在大范围区域内平均水平的高分辨率养分垂直剖面，重新审查了通过湍流混合向上部海洋提供的营养，这与詹金斯（1982）的研究结果直接相当。根据Gregg（1989）和Zhang等人的研究，分别将内部波和盐指法引起的湍流分离。 （1998）。由于内波引起的湍流，通过指盐法将养分运入营养消耗性表层的速度比运种高五倍。即使考虑了涡流，平流和水平扩散等其他物理传输机制，也无法解决上述明显的矛盾。垂直湍流扩散引起的硝酸盐通量估计为0.05-0.15 mol m〜（-2）a〜（-1），相当于4-11 gC m〜（-2）a〜（-1）。观察到的高达23的NO3 / PO4湍流比被解释为N2固定的烙印。

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