Quantification of boundary mixing using expendable microstructure profilers for the deep ocean and its incorporation into the global thermohaline circulation model

深海潜流扩散系数的全球制图对于精确模拟全球温盐环流至关重要。然而，在~2000 m深度以下的全球横冲扩散率分布仍然未知。为了澄清这一点，我们部署了一个自由落体多尺度剖面仪VMP-5500，它可以测量微尺度湍流以及从海面到~6000米深度的背景细尺度切变和应变。利用同时获得的细尺度和微尺度数据，并结合潮汐与深海粗糙海床相互作用产生的内波在背景剪切场和应变场中传播的并行数值模拟，我们成功地建立了一个用细尺度参数表示的深海粗糙海床附近底波扩散系数的经验公式。

The global mapping of diapycnal diffusivities in the deep ocean is essential for accurate modeling of global thermohaline circulation. Nevertheless the global distribution of diapycnal diffusivities below a depth of ～2000 m remains unknown. In order to clarify this, we have deployed a free-fall multi-scale profiler VMP-5500 thatcan measure microscale turbulence as well as the background fine-scale shear and strain from the sea surface down to a depth of ～6000 m. Using a combination of the fine-scale and microscale data thus obtained simultaneously together with the aid of the concurrent numerical simulation of internal waves which are generated by tidal interaction with abyssal rough bottom and propagate through the background shear and strain fields, we have succeeded in developing an empirical formula for diapycnal diffusivities near abyssal rough sea beds expressed in terms of fine-scale parameters.