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

南大洋溶解有机物的分布、源和汇

• 批准号: 9530609
• 负责人: Catherine Goyet
• 金额: $ 34.25万
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-08-01 至 1999-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9530609&HistoricalAwards=false
• 关键词: Distribution; Sources; Sinks; Dissolved; Organic

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. ***

该研究项目是美国联合全球海洋通量研究（JGOFS）南大洋项目的一部分，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，以及(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的南大洋实验的44个合作项目之一。南大洋实验是在南极极地锋面区以南进行的一项为期三年的努力，旨在追踪碳从空气-海洋界面通过整个水柱进入底部沉积物的有机和无机途径的流动。该实验将利用RVIB纳撒尼尔B.帕尔默和R/V汤普森。该组成部分的五个主要目标是：(1)通过船载测量确定南大洋溶解有机碳（DOC）和总有机碳（TOC），以及溶解有机质（DOM）的时空分布；(2)查明网络DOM生产和出口场所；(3)估算DOM净产量和出口量；(4)估算DOM细菌再矿化率；(5)将这些速率置于全球碳循环的背景下。DOM生产和消耗的净速率将通过现场测量和船上孵化实验相结合的方法来估计。大尺度的速率将由简单的箱形和平流-扩散模式的组合来计算。常规样品收集将通过从CTD玫瑰花上的10升Niskin瓶中抽取的小水样来完成。这项工作的重点是进行大规模的调查，并在季节性的基础上重复这些调查，并将与一项补充性研究合作进行，该研究强调以过程为导向的细菌再矿化率测量。南大洋是JGOFS研究中唯一一个垂直稳定性较低、中深水团正在形成的地点。这种情况允许直接观察DOM在深海中被隔离的速率。* * *