How a Small Reef in the Kuroshio Cultivates the Ocean
How a Small Reef in the Kuroshio Cultivates the Ocean
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DOI：
10.1029/2020gl092063
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发表时间：
2021-04-16
影响因子：
5.2
通讯作者：
Guo, X.
中科院分区：
文献类型：
--
作者：
Hasegawa, D.;Matsuno, T.;Guo, X.
黑潮小礁周围的湍流混合和上升流相关的垂直硝酸盐通量是通过连续部署湍流微结构剖面仪和附连的潜水紫外线硝酸盐分析仪来量化的，同时从珊瑚礁的上游漂移到下游。用船载ADCP和回声测深仪识别了开尔文-亥姆霍兹波浪(厚度=60m)的流动分离和流动序列。与强烈的湍流混合相关的湍流扩散率高达O(10(-1)m(2)S(-1))，导致较强的硝酸盐通量O(1-10(3)mmolm(-2)d(-1))。此外，上下游密度剖面的差异很大，表明整个次表层的上升流速度为O(10(-3)m S(-1))，上升流的硝酸盐通量为O(10(2)mmolm(-2)天(-1))。
Vertical nitrate fluxes associated with turbulent mixing and upwelling around a small reef in the Kuroshio are quantified by continuously deploying a turbulence microstructure profiler with an attached submersible ultraviolet nitrate analyzer while drifting from the upstream to the downstream of the reef. Flow separations and trains of Kelvin-Helmholtz billows (thickness = 60 m) are identified using a shipboard ADCP and an echo-sounder. The turbulence diffusivity associated with the vigorous turbulent mixing reaches up to O(10(-1) m(2) s(-1)), resulting in strong nitrate fluxes of O(1-10(3) mmol m(-2) day(-1)). In addition, large differences between the upstream and downstream density profiles suggest a strong upwelling velocity of O(10(-3) m s(-1)), as well as an upwelling nitrate flux of O(10(2) mmol m(-2) day(-1)) in the entire subsurface layer.