Multitracers II - Wintertime Particle Production, Transport and Sedimentation

多示踪剂项目的一个重要目标是量化俄勒冈海岸从最后一次冰川高峰到现在的古生产力（定义为从光带流出的有机碳通量）。通过实现这一目标，pi还将开发可应用于海洋其他地方的古生产力示踪剂，并确定每种示踪剂的局限性。三个沉积物捕集器系泊形成远离俄勒冈海岸的样带是示踪剂校准的关键方面。该方法是应用多种示踪剂（有机组分、无机元素（Cu、Zn、Ba）、有机地球化学生物标志物和微化石）来确定它们何时提供一致的信息，并确定它们何时开始跟踪除生产力以外的古海洋变量。为多示踪剂项目提供额外的现场季节资金，包括在两个近海地点部署两个为期6个月的捕集器。高溶解度沉积物捕集器数据和春季水柱资料应能充分确定该地区冬春生产力事件。此外，沉积物陷阱通量的三年时间序列将有助于了解加州洋流生产力的年际变化。这是对先前资助的项目“通过沉积物和沉积物圈养材料预测加州洋流系统古生产力的多示踪剂”（OCE-8609366）的修改。

An important goal of the Multitracers Project is to quantify paleoproductivity (defined as organic carbon flux out of the euphotic zone) off the coast of Oregon from the peak of the last glacial maximum to the present. By accomplishing this goal the PIs will also develop paleoproductivity tracers that can be applied elsewhere in the oceans, and establish the limitations of each tracer. Three sediment trap moorings forming a transect away from the Oregon coast are a key aspect of the tracer calibration. The approach is to apply multipletracers for productivity the bulk organic fraction, inorganic elements (Cu,Zn,Ba), organic geochemical biomarkers, and microfossils to determine when all give consistent information and to determine when each begins to track paleoceanogrphic variables other than productivity. Funding is provided for an additional field season for the Multitracers Project, consisting of two 6 month trap deployments at the two inshore sites. The high-solution sediment trap data and the water column information from the springtime should enable to adequately define winter-spring productivity events in the region. In addition, the three-year time series of sediment trap fluxes will help understand the interannual variability of productivity in the California Current. This represents a modification to the previously funded project entitled "Multitracers to predict paleoproductivity in the California Current System from sediment and sediment trap materials" (OCE-8609366).