Abyssal Mixing Measurements for the Brazil Basin Tracer Release Experiment

将在巴西盆地的两个深海地点（靠近西部边界和内部）进行全水柱湍流、速度切变和精细结构测量，同时在3000 m深度进行有目的的示踪剂释放。通过对巴西盆地深部动能耗散和热变化的观测，估计了巴西盆地深部的内波扩散系数，并记录了内波的能量水平和支持混合的机制。基于微观结构的扩散率估计，受空间和时间采样约束的限制，将与Ledwell及其同事（OCE-9515598）从示踪剂色散中获得的结果进行比较。将与WOCE深盆地试验大尺度预算确定的盆地平均混合率进行进一步比较。

9415589 Schmitt Full water column turbulence, velocity shear and fine-structure measurements will be conducted in the deep ocean at two sites in the Brazil Basin (near the western boundary and in the interior) concurrently with a purposeful tracer release at 3000 m depth. The diapycnal diffusivity in the deep Brazil Basin will be estimated from the observation from the dissipation of kinetic energy and thermal variance, and the nergy levels of internal waves and the mechanisms supporting that mixing will be documented. The microstructure-based diffusivity estimates, limited by sampling constaints in space and time will compared with those obtained by the Ledwell and colleagues (OCE-9515598) from their tracer dispersion. Additional comparisons will be made with the basin-averaged mixing rates determined from the large-scale budgets of the WOCE Deep Basin Experiment.