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首页> 外文期刊>Ocean science >Mapping turbulent diffusivity associated with oceanic internal lee waves offshore Costa Rica
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Mapping turbulent diffusivity associated with oceanic internal lee waves offshore Costa Rica

机译：绘制与哥斯达黎加近海内部里风波相关的湍流扩散率

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摘要

Breaking internal waves play a primary role in maintaining the meridional overturning circulation. Oceanic lee waves are known to be a significant contributor to diapycnal mixing associated with internal wave dissipation, but direct measurement is difficult with standard oceanographic sampling methods due to the limited spatial extent of standing lee waves. Here, we present an analysis of oceanic internal lee waves observed offshore eastern Costa Rica using seismic imaging and estimate the turbulent diffusivity via a new seismic slope spectrum method that extracts diffusivities directly from seismic images, using tracked reflections only to scale diffusivity values. The result provides estimates of turbulent diffusivities throughout the water column at scales of a few hundred meters laterally and 10 m vertically. Synthetic tests demonstrate the method's ability to resolve turbulent structures and reproduce accurate diffusivities. A turbulence map of our seismic section in the western Caribbean shows elevated turbulent diffusivities near rough seafloor topography as well as in the mid-water column where observed lee wave propagation terminates. Mid-water column hotspots of turbulent diffusivity show levels 5 times higher than surrounding waters and 50 times greater than typical open-ocean diffusivities. This site has steady currents that make it an exceptionally accessible laboratory for the study of lee-wave generation, propagation, and decay.
机译：打破内部波浪在维持子午翻转循环中起主要作用。已知海洋背风波是与内部波消散相关的二面体混合的重要因素，但由于立式背风波的空间范围有限，因此直接测量很难用标准海洋采样方法进行。在这里，我们使用地震成像技术对哥斯达黎加东部沿海近海观测到的内部里风波进行了分析，并通过一种新的地震坡度谱方法估计了湍流扩散率，该方法直接从地震图像中提取了扩散率，仅使用了跟踪反射来确定扩散率值。结果提供了在整个水柱中湍流扩散率的估计值，其横向水平为几百米，垂直方向为10 m。综合测试证明了该方法具有解析湍流结构和再现准确扩散性的能力。我们在加勒比海西部的地震剖面的湍流图显示，在粗糙的海底地形附近以及在观察到的回风传播终止的中层水柱中，湍流扩散率升高。水域中湍流扩散率热点的水平比周围水域高5倍，比典型的开放海洋扩散度高50倍。该地点的水流稳定，因此成为研究风波的产生，传播和衰减的绝佳场所。

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