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构建一个数学模型，将北大西洋初级生产力对大气中二氧化碳的固定与碳向深海的输出联系起来。他们将结合对大洋流方案深水沉积物捕捉器的观测(运行了21年以上)、百慕大大西洋时间序列站点的真光带测量(10年以上)、中上层/底层浮游动物的历史数据，以及关于上层到中层/底层浮游生物通量的生态系统生物地球化学模型。BATS的上层海洋颗粒通量与OFP陷阱测量的深层颗粒通量之间存在显著的协方差，并且颗粒通量的成分随深度的强烈修正和强收敛成为关于质量通量大小的不变成分。最令人关注的是，海洋再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的合成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种预报模式将真光带过程与中、深海带过程机械地联系起来，该模式可用于加深我们对这些无与伦比的时间序列数据的理解，并检验受一组现场数据约束的假设。为此，PIs将得出中/深海生态系统结构，并用它来模拟生物地球化学活性成分(碳、氮和二氧化硅)的通量。该模式的中/深海部分将由一个公认的上层海洋模式推动，该模式将适度复杂但稳健的生态系统模式与最先进的上层海洋物理混合模式结合起来。驱动因素的选择源于一项基本假设，即从沉积物陷阱数据推断的中/深海活动是对上层海洋生态系统对气象规模事件的时变反应的反应。

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.