Multitracers II - Wintertime Particle Production, Transport and Sedimentation

多重示踪剂项目的一个重要目标是量化俄勒冈州海岸外从最后一次冰盛期高峰期到现在的古生产力(定义为从真光带流出的有机碳通量)。通过实现这一目标，PIS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。形成一个远离俄勒冈海岸的样带的三个沉积物捕捉器系泊是示踪剂校准的一个关键方面。方法是应用生产力的多重示踪剂，包括整体有机组分、无机元素(铜、锌、钡)、有机地球化学生物标志物和微化石，以确定何时所有元素都能提供一致的信息，并确定每个元素何时开始追踪生产力以外的古海洋地理学变量。为多重追踪器项目提供了额外的实地季节的经费，包括在两个沿海地点部署两个6个月的诱捕器。春季的高分辨率沉积物捕获器数据和水柱信息应能充分界定该区域的冬春季生产力事件。此外，沉积物捕集通量的三年时间序列将有助于了解加州海流生产力的年际变化。这是对以前资助的题为“利用沉积物和沉积物捕捉器材料预测加州海流系统古生产力的多重示踪器”(OCE-8609366)项目的修改。

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).