Remineralization of Biogenic Material at the Seafloor: Temporal and Spatial Variability

海底生物物质的再矿化：时空变化

• 批准号: 9012473
• 负责人: Frederick Sayles
• 金额: $ 92.22万
• 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: 1990
• 资助国家: 美国
• 起止时间: 1990-12-01 至 1995-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9012473&HistoricalAwards=false
• 关键词: Remineralization; Biogenic; Material; Seafloor; Temporal

Remineralization of Biogenic Material at the Seafloor: Temporal and Spatial Variability Temporal variability of fluxes across the sediment-water interface at the GOFS Bermuda Time Series Site will be measured to characterize the bentic cycles of biogenic sediment components of an oligotrophic gyre. Data collected to date demonstrate that there is large temporal variability, and that the cycle closely parallels that of particulate fluxes. The relationship between particle fluxes, fluxes across the interface and the amplitude of variability will be used to characterize the occurrence, reactivity and significance of "labile" organic carbon remineralization at this site. In addition, experiments seek to define the stoichiometry, rates, and location in the sediment column of diagenetic reactions affecting organic matter, CaCO3, and biogenic SiO2. The data should uniquely define the response of benthic processes to varying conditions in the water column and surface ocean. Studies of organic matter degradation and CaCOO3 dissolution will be extended to a regional scale with a transect of the Western North Atlantic continental margin. This research seeks to define the amounts and rate of diagenetic dissolution of CaCO above the lysocline, as well as the factors that influence this aspect of the CaCO3 cycle in the oceans

海底生物物质的再矿化：将测量GOFS百慕大时间序列站点沉积物-水界面通量的时间和空间变异性，以表征少营养环流生物来源沉积物成分的生物循环。迄今收集的数据表明，存在很大的时间变异性，并且周期与颗粒通量的周期密切相关。颗粒通量、跨界面通量和变异性幅度之间的关系将被用来表征该地点“不稳定的”有机碳再矿化的发生、反应和意义。此外，实验试图确定影响有机质、碳酸钙和生物成因二氧化硅的成岩反应的化学计量比、速率和在沉淀柱中的位置。这些数据应唯一地界定底栖过程对水柱和表层海洋中不同条件的反应。有机质降解和CaCO3溶解的研究将扩展到区域范围，并在西北大西洋大陆边缘横断面上进行。这项研究试图确定溶跃层以上CaCO的成岩溶解的数量和速率，以及影响海洋CaCO3循环这一方面的因素。