Comparative Dynamics of CDOM in Open Ocean Systems

有色溶解有机物（CDOM）广泛分布于全球海洋中，可能是贫营养海洋沃茨光学特性的主要决定因素。 它也可能在地球化学上重要的光化学反应中发挥重要作用，我们才开始认识到-更不用说理解了。 在这项研究中，百慕大生物研究实验室的三名年轻科学家将测试关于微生物介导的CDOM生产及其光解分解的几种假设。 将在百慕大大西洋时间序列站点附近的马尾藻海环境中进行四组实验，以确定（1）作为DOM质量的函数的CDOM的微生物产生，（2）作为来源的函数的CDOM的物理性质，（3）CDOM的替代来源（例如，浮游动物，而不是浮游植物和浮游细菌），和（4）漂白后CDOM对微生物的生物利用度的变化。该团队希望对控制远离陆地的开放海洋环流中CDOM分布的因素进行定量描述。

ABSTRACTOCE-9977399Colored dissolved organic matter (CDOM) is distributed throughout the world ocean and may be a major determinant of the optical properties of oligotrophic ocean waters. It may also play a major role in biogeochemically significant photochemical reactions that we are only beginning to recognize -- let alone understand. In this study, three young scientists at the Bermuda Biological Laboratory for Research will test several hypotheses regarding microbially-mediated production of CDOM and its photolytic decomposition. Four sets of experiments will be undertaken in Sargasso Sea environments near the Bermuda Atlantic Time-Series site to determine (1) the microbial production of CDOM as a function of the quality of DOM, (2) the photophysical properties of CDOM as a function of origin, (3) alternate sources of CDOM (for example, zooplankton as opposed to phytoplankton and bacterioplankton), and (4) changes in the bioavailability of CDOM to microbes after bleaching. The team expects to produce a quantitative description of the factors controlling CDOM distribution in the open ocean gyres far from land.