Distribution, Sources and Sinks of Dissolved Organic Matter in the Southern Ocean

小行星9530609 该研究项目是美国联合全球海洋通量研究（JGOFS）南大洋计划的一部分，旨在（1）更好地了解南大洋有机和无机碳通量，（2）确定调节这些通量的大小和变化的物理，生态和生物地球化学因素和过程，（3）将这些通量置于当代全球碳循环的背景下。 这项工作是全球海洋通量联合研究南大洋实验中合作的44个项目之一。 南大洋实验是在南极极地锋区以南进行的一项为期三年的努力，旨在跟踪碳通过其有机和无机途径从空气-海洋界面通过整个水柱进入底部沉积物的流动。 实验将使用RVI B Nathaniel B。帕默和汤普森号 这一部分的五个主要目标是：（1）通过船上测量确定南大洋溶解有机碳（DOC）和总有机碳（TOC）以及溶解有机物（DOM）的时空分布;（2）确定DOM净产生和输出的地点;（3）估计DOM净产生和输出的速率;（4）估算DOM的细菌矿化速率;（5）将这些速率置于全球碳循环的背景下。 DOM生产和消费的净速率将通过现场测量和船上培养实验相结合来估计。 大规模的速率将从一个简单的盒子和对流扩散模型的组合计算。 将通过从CTD玫瑰花上的10 L Niskin瓶中抽取少量水样完成常规样本采集。 这项工作的重点是进行大规模调查，并在季节性基础上重复这些调查，并将与一项补充研究合作进行，该研究强调以过程为导向的细菌再矿化率测量。 南大洋是唯一一个垂直稳定性低、正在形成中层和深层水团的JGOFS研究地点。 在这种情况下，可以直接观测DOM在深海中的封存率。 ***

9530609 Peltzer This research project is part of the US Joint Global Ocean Flux Study (JGOFS) Southern Ocean Program aimed at (1) a better understanding of the fluxes of carbon, both organic and inorganic, in the Southern Ocean, (2) identifying the physical, ecological and biogeochemical factors and processes which regulate the magnitude and variability of these fluxes, and (3) placing these fluxes into the context of the contemporary global carbon cycle. This work is one of forty-four projects that are collaborating in the Southern Ocean Experiment of the Joint Global Ocean Flux Study. The Southern Ocean Experiment is a three-year effort south of the Antarctic Polar Frontal Zone to track the flow of carbon through its organic and inorganic pathways from the air-ocean interface through the entire water column into the bottom sediment. The experiment will make use of the RVIB Nathaniel B. Palmer and the R/V Thompson. The five principal objectives of this component are (1) to determine via shipboard measurement of both dissolved organic carbon (DOC) and total organic carbon (TOC), and the spatial and temporal distribution of dissolved organic matter (DOM) in the Southern Ocean; (2) to identify the sites of net DOM production and export; (3) to estimate rates of net DOM production and export; (4) to estimate rates of bacterial remineralization of DOM; and (5) to place these rates in the context of the global carbon cycle. The net rates of DOM production and consumption will be estimated by a combination of in situ measurements and shipboard incubation experiments. Large scale rates will be calculated from a combination of simple box and advection-diffusion models. Routine sample collection will be accomplished via small water samples drawn from 10 liter Niskin bottles on the CTD rosette. This work will have an emphasis on making large- scale surveys and repeating these surveys on a seasonal basis, and will be conducted in collabora tion with a complementary study that emphasizes process-oriented measurements of bacterial remineralization rates. The Southern Ocean is the only JGOFS study site where the vertical stability is low, and where intermediate and deep water masses are being formed. This situation allows the direct observation of the rate at which DOM is sequestered in the deep ocean. ***