SGER: Evaluation of Sediment Trap Fluxes by Thorium Scavenging, a Three Dimensional Approach

此活动将进行明确的（或几乎如此） 利用自由漂移圆柱形沉积物收集器校准 原位清除234钍作为一个独立的预测， 下沉的磁通量 沉积物收集器测量的钍通量 将与预测的钍通量从原位 拾荒 为了避免解释中的历史问题 单钍剖面，一个扩大的实验将是 其中钍清除通过时间和 将遵循空间的可变性。 新的剖析技术 也平均整个水柱垂直，从而确保 任何小规模的钍极小区 数量上包括。 这组测量将提供 迄今为止对钍粒子最明确的预测 沉积物捕获器预计收集的通量。如果沉积物 陷阱测量的钍通量与预测的有很大差异 值，则可以得出结论，陷阱不 定量地收集那些导致 钍运输，因此可能不太可能是准确的其他 粒子类也是。 如果价值观一致，就可以得出结论， 这个陷阱能准确捕捉到运输钍的粒子 因此表明它们对于其他粒子可能是准确的 班级也是。 无论哪种情况，这个实验都将证明 一个稳定的方法，用于校准沉积物收集器数据， 字段，这将是有用的其他实验的陷阱性能 (e.g.流体动力学）。

This activity will conduct an unambiguous (or nearly so) calibration of free-drifting cylindrical sediment traps using the in situ scavenging of 234-thorium as an independent predictor of the sinking flux. Thorium fluxes as measured by the sediment trap will be compared with predicted thorium fluxes from the in situ scavenging. To avoid historical problems with the interpretation of single thorium profiles, an expanded experiment will be performed in which both the thorium scavenging through time and the variability in space will be followed. The new profiling technique also averages the entire water column vertically, thus ensuring that any small-scale thorium minima in the profile will be quantitatively included. This set of measurements will provide the most unambiguous prediction to date of the thorium-bearing particle flux that a sediment trap is predicted to collect. If the sediment trap measured thorium flux differs greatly from the predicted value, it will be able to be concluded that the trap does not quantitatively collect the particles that are responsible for thorium transport and thus may be unlikely to be accurate for other particle classes as well. If the values agree, it can be concluded that the trap is accurate for the particles that transport thorium and thus suggest that they may be accurate for other particle classes as well. In either case, this experiment will demonstrate a robust method for the calibration of sediment trap data in the field that will be useful for other experiments on trap performance (e.g. hydrodynamics).