Time Series Sediment Trapping in the Sargasso Sea and A Search for an Efficient Assessment of the Biological Pump

马尾藻海中的时间序列沉积物捕获和生物泵有效评估的探索

• 批准号: 9215350
• 负责人: Werner Deuser
• 金额: $ 41.49万
• 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: 1992
• 资助国家: 美国
• 起止时间: 1992-12-01 至 1995-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9215350&HistoricalAwards=false
• 关键词: Time; Series; Sediment; Trapping; Sargasso

This project represents the balance of support required for studies related to time-series sediment trapping in the Sargasso Sea and for assuring continuation of the work beyond the present P.I.'s full-time involvement. The proposed work has two primary objectives: (1) A major portion of the effort will be spent on identifying relationships between surface-ocean variables and deep- ocean carbon flux. The marine biota is thought by many investigators to play an important part in the removal of carbon from the atmosphere and upper ocean to the deep ocean through the production of organic and carbonate particles which sink out of the mixed layer. There is, however, a considerable range in estimates of the effectiveness of this mechanism, the "biological pump", relative to the amounts of carbon dioxide injected into the atmosphere by human activities. An assessment of the magnitude, variability and secular trend of the pump is thus desirable. Direct measurement of deep-ocean carbon flux is far too expensive and labor-intensive to be done on a large scale over extended periods. However, there is a distinct possibility that much more easily monitored surface-ocean properties may serve as proxies for deep carbon flux. To test this hypothesis, this study will investigate whether or not carbon flux varies in a consistent relationship to variations in one or a combination of several of those surface properties. Identification of suitable proxies may permit long-term monitoring of the deep carbon flux on large scales. Comparative studies of existing time series of remote- sensing, meteorologic, and hydrographic data on one hand and of deep carbon-flux data on the other are a promising approach. The emphasis in such studies will be on other-than-annual periods because the annual cycle, common to all likely proxy candidates, is of little value in revealing causative connections. Comparisons will be made between continuous deep carbon-flux measurements in the Sargasso Sea and a superior variety of hydrographic and meteorologic data sets, as well as satellite data, for the area. While the Sargasso Sea is representative of only one of several major oceanographic domains which are likely to have different characteristic proxies and proxy-carbon flux relationships, the ability to assess carbon flux by means of proxies even in part of the ocean can free resources for more intensive in-situ studies in other areas. (2) Present modeling efforts at determining means and time variances of the source areas and paths of particles collected by sediment traps at different depths, i.e. using real and model current vectors in the sampling area to delineate the shapes of the statistical funnels connecting the traps to the sea surface, will be completed.

该项目代表了与萨尔加索海中时间序列陷阱有关的研究所需的支持平衡，并确保了当前P.I.全日制参与以外的工作的继续。 拟议的工作有两个主要目标：（1）将花费的很大一部分用于识别表面 - 海洋变量与深海碳通量之间的关系。 许多研究人员认为，海洋生物群是通过产生从混合层中沉入的有机和碳酸盐颗粒来从大气和上海去除深海中扮演重要角色。 但是，相对于通过人类活动注入大气中二氧化碳的量，这种机制的有效性，“生物泵”的估计值相当大。 因此，需要评估泵的大小，变异性和世俗趋势。 直接测量深海洋碳通量太昂贵且劳动密集型，无法在长时间内进行大规模完成。 但是，有一个明显的可能性更容易监测的表面海洋特性可能是深碳通量的代理。 为了检验这一假设，本研究将研究碳通量是否与其中几种表面特性的一个或组合的变化保持一致的关系。 识别合适的代理可以允许长期监测大尺度上的深碳通量。 一方面的遥感，气象和水文数据的现有时间序列的比较研究是一种有希望的方法。 此类研究的重点将是超过另一年的时期，因为所有可能的代理候选人共有的年度周期在揭示因果关系方面几乎没有价值。 将在Sargasso Sea中的连续深碳 - 升华测量与该地区的卫星数据以及卫星数据之间进行比较。 虽然Sargasso Sea仅代表了几个主要的海洋学领域之一，这些海洋学领域可能具有不同的特征代理和代理 - 碳通量关系，但通过代理评估碳通量的能力，即使在一部分的海洋中也可以免费资源免费资源，以获取更多资源在其他领域进行密集的原位研究。 （2）目前的建模努力，以确定由沉积物陷阱在不同深度收集的源区域的平均值和时间差异，即使用采样区域中的真实和模型的电流向量来描述连接陷阱的统计Funnels的形状到海面，将完成。