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

将对作为大西洋全球海洋流动倡议组成部分的圆锥形和圆柱形沉积物捕集器设计进行现场调查，以了解沉积物捕集器收集效率与捕集器水动力之间的关系。这些研究将包括对百慕大遗址的系泊和漂流沉积物捕集器收集系统进行仔细评估，该地点正在进行长期观测。本次研究的自变量是泥沙捕集器的几何形状，因变量是捕集器的水动力和收集效率。将使用实验室校准的自给式仪器包(HDS)进行现场水动力学观测，该仪器包以非阻塞性的方式记录圈闭内外关键位置的流动和井口剪应力。这项工作的主要产品之一将是一种简单、易于使用的流场传感器组件，可用于全球海洋通量调查。通过将颗粒累积速率与沉积物捕捉器及其周围的现场流体动力学观测联系起来，预计可以消除流体动力学偏差，并推断出功能上与理想的非侵入性收集设备所提供的通量速率相同的通量速率。

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.