The Hydromechanics of Sediment Traps in the Oceanic Environment: Key to Accurate Particle Flux Measurements

对大西洋全球海洋通量计划中不可或缺的锥形和圆柱形沉积物捕集器设计，将进行沉积物捕集器收集效率与捕集器流体动力学之间关系的现场调查。这些研究将包括仔细评估百慕大站点的系泊与漂流沉积物收集器收集系统，该站点正在进行长期观察。本研究的自变量是沉积物陷阱的几何形状，而因变量是陷阱的流体动力学和收集效率。现场流体动力学观测将使用实验室校准的独立仪器包（HDS）来获得，该仪器包可以在圈闭内外的关键位置以非突出的方式记录流体和井切应力。这项工作的主要产品之一将是一个简单，易于使用的流场传感器包，可用于全球海洋通量调查。通过将颗粒积累速率与沉积物圈闭内及其周围的原位水动力观测联系起来，预计可以消除流体动力学偏差，并推断出与理想的非突出性收集装置提供的功能相当的通量速率。

An In situ investigation of the relationship between sediment trap collection efficiency and trap hydrodynamics will be conducted for sediment trap designs, cone shaped and cylindrical, which are integral to the Global Ocean Flux initiative in the Atlantic Ocean. The studies will include a careful assessment of moored versus drifting sediment trap collection systems at the Bermuda site where long term observations are in progress. The independent variable in this investigation is sediment trap geometry, while the dependent variables are trap hydrodynamics and collection efficiency. In situ hydrodynamic observations will be obtained using laboratory-calibrated self-contained instrument packages (HDS) which record both flow and well shearing stress in a non-obstrusive way at critical locations inside and outside the traps. One of the principal products of the work will be a simple, easy-to-use, flow-field sensor package which can be applied to Global Ocean Flux investigations. By linking particle accumulation rates with In situ hydrodynamic observations in and around sediment traps, it is expected that fluid-dynamic bias can be removed and flux rates inferred which are functionally equivalent to those provided by an ideal, non- obtrusive collection device.