A Coupled Epipelagic Meso-/Bathypelagic Particle Flux Model for the Bermuda Atlantic Time-Series Station/Oceanic Flux Program Site

在这个项目中，伍兹霍尔海洋研究所的研究人员将建立一个数学模型，将北大西洋初级生产对大气二氧化碳的固定与碳向深海的输出联系起来。 它们将把海洋通量方案深水沉积物捕集器（运行21年以上）的联合收割机观测、百慕大大西洋时间序列站真光层测量（10年以上）和历史中/深海浮游动物数据与基于生态系统的从上层到中/深海层颗粒通量生物地球化学模型结合起来。在BATS的上层海洋粒子通量和由OFP陷阱测量的深层粒子通量之间存在非常强的协方差，以及粒子通量的组成随深度的强烈修改和强收敛到相对于质量通量的大小不变的组成。最根本的问题是海洋矿化的变化将如何影响通过水柱的物质通量的大小，这是美国联合全球海洋通量研究综合和建模项目的主要研究轨迹之一。该项目的中心目标是通过一个预测模型，将真光层过程与中层和深海层过程机械地联系起来，该模型可用于进一步了解这些无与伦比的时间序列数据，并检验受一组现场数据约束的假设。为此，研究所将得出一个中/深海生态系统结构，并利用它来模拟地球化学活性成分（碳、氮和二氧化硅）的通量。该模型的中层/深海层部分将由一个完善的海洋上层模型驱动，该模型将一个适度复杂但稳健的生态系统模型与最先进的上层海洋物理混合模型相结合。选择驱动因素的依据是一个基本假设，即从沉积物收集器数据推断的中层/深海活动是上层海洋生态系统对气象尺度事件随时间变化的反应。

ABSTRACTOCE-0097288In this project researchers at the Woods Hole Oceanographic Institution will construct a mathematical model relating the fixing of atmospheric carbon dioxide by primary production in the North Atlantic Ocean to the export of that carbon to the deeper ocean. They will combine observations of deep-water sediment traps (in operation for 21+ years) at the Oceanic Flux Program (OFP), euphotic zone measurements (10+ years) at the Bermuda Atlantic Time-series Site (BATS), and historical meso/bathypelagic zooplankton data with an ecosystem-based biogeochemical model of particle flux from the epipelagic to meso/bathypelagic zone. There is a remarkably strong covariance between the upper ocean particle flux at BATS and the deep particle flux measured by the OFP traps, as well as intense modification and strong convergence of the composition of the particle flux with depth to a invariant composition with respect to the magnitude of mass flux. Of fundamental concern is how changes in ocean remineralization will affect the magnitude of material fluxes through the water column, which is one of the major research trajectories of the Synthesis and Modeling Project of the U.S. Joint Global Ocean Flux Study. The central objective of the project is to mechanistically connect euphotic zone processes with meso- and bathypelagic zone processes by means of a prognostic model that can be used to further our understanding of these unparalleled time-series data and to test hypotheses constrained by a battery of in situ data. To do this, the PIs will derive a meso/bathypelagic ecosystem structure and use it to model the flux of biogeochemically active constituents (carbon, nitrogen and silica). The meso/bathypelagic portion of the model would be driven by a well-established epipelagic model coupling a moderately complex, yet robust, ecosystem model with a state-of-the-art physical upper-ocean mixing model. The choice of driver derives from the underlying hypothesis that the meso/bathypelagic activity inferred from the sediment trap data is a response to time-varying responses of the upper ocean ecosystem to events of meteorological scale.