Investigating the role and chemical nature of dissolved organic matter in marine environments

研究海洋环境中溶解有机物的作用和化学性质

• 批准号: RGPIN-2019-04947
• 负责人: Reader, Heather
• 金额: $ 1.82万
• 依托单位: Memorial University of Newfoundland
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=748063
• 关键词: Investigating; role; chemical; nature; dissolved; Investigating; role; chemical; nature; dissolved

Marine dissolved organic matter (DOM) is an enigmatic pool of carbon-based compounds in the world's oceans, representing a pool of carbon comparable in size to the atmospheric pool of carbon dioxide. It is a complex mixture of thousands of unique chemical compounds, of which only ~10% are truly identifiable. DOM reactivity varies considerably with some fractions turning over in the order of hours to days, and others turning over on the scale of millennia. The chemical nature of DOM drives reactivity and to understand the diverse roles that DOM plays in the carbon cycle from local to global scales, it is necessary to understand the chemistry of DOM. Our research program is defined by the overarching goal of understanding the role that DOM plays in the global carbon cycle and how it impacts marine ecosystems. Three specific objectives will examine different aspects of DOM chemistry: 1.Linking Reactivity to Detailed Chemical Analysis Despite recent advances in analytical techniques, little is known about how the presence or absence of individual compounds affects the overall reactivity of DOM. It is this reactivity, however, that determines the ultimate fate of DOM in the marine system. We will use methodical approaches to bridge the structure and function of DOM; focusing on defining the chemical nature of DOM in the context of its reactivity in the marine environment. Specific emphasis will be on determining the important functional groups that drive DOM dynamics. 2.Linking Advanced Analytical Techniques to Optical Properties Combining optical measurements with detailed chemical analysis will give insight into what causes the optical properties of marine waters, with the goal of developing better chemical tracers for oceanic processes. Advanced analytical techniques will provide the detailed chemical information about DOM, and optical techniques, which are relatively rapid and low-cost, will allow for better spatial and temporal coverage of DOM properties. Developing these linkages will provide better synoptic analyses of the importance of DOM dynamics in marine systems. 3.Investigating the Dynamics of Organic Matter in Sensitive Marine Environments Marine environments play important roles in the global carbon cycle. With respect to DOM, they are both affected by and affecting how carbon cycles in the marine environment. Understanding DOM cycling in rapidly changing environments is a crucial part of understanding the effects of climate change in the global ocean. Northern and coastal regions are changing rapidly. Our research program will focus on areas such as coastal Labrador and the North Atlantic Ocean. We will investigate DOM dynamics by taking advantage of Volunteer Observing Ships to collect broad spatial and temporal datasets of DOM in the marine environment. The combination of these three complementary objectives and the results they will provide will help us to understand a challenging but crucial part of the marine carbon cycle.

海洋溶解有机物（DOM）是世界海洋中碳基化合物的神秘池，代表了与二氧化碳大气池相当的碳池。它是数千种独特化合物的复杂组合，其中只有约10％是可以识别的。 DOM反应性的范围很大，一些分数在几个小时到几天的顺序中翻转，而另一些则在数千年的规模上翻转。 DOM的化学性质驱动了反应性，并了解DOM在碳循环中从局部到全球尺度的发散作用，有必要了解DOM的化学性质。我们的研究计划由理解DOM在全球碳循环中及其影响海洋生态系统的作用的总体目标定义。三个特定的目标将检查DOM化学的不同方面：1。尽管最近进步的分析技术进展，但对详细的化学分析的反应性链接到了对单个化合物的存在或不存在如何影响DOM的整体反应性的知之甚少。但是，正是这种反应性决定了海洋系统中DOM的最终命运。我们将使用有条理的方法来弥合DOM的结构和功能。专注于在海洋环境中反应性的背景下定义DOM的化学性质。具体的重点将是确定驱动DOM动态的重要官能团。 2.将高级分析技术链接到将光学测量与详细化学分析结合的光学特性相结合，将洞悉导致海水的光学特性的洞察，目的是为海洋过程开发更好的化学示踪剂。先进的分析技术将提供有关DOM和光学技术相对较快和低成本的详细化学信息，它将允许更好地覆盖DOM的空间和临时覆盖范围。开发这些链接将提供更好的天气分析，以了解海洋系统中DOM动态的重要性。 3。研究敏感海洋环境中有机物的动态海洋环境在全球碳循环中起着重要作用。关于DOM，它们既受海洋环境中的碳周期的影响和影响。在迅速变化的环境中了解DOM循环是了解全球海洋气候变化影响的关键部分。北部和沿海地区正在迅速变化。我们的研究计划将重点放在沿海拉布拉多和北大西洋等地区。我们将通过利用志愿者观察船只在海洋环境中收集DOM的广泛空间和临时数据集来研究DOM动态。这三个完整对象及其将提供的结果的结合将有助于我们了解海洋碳周期的挑战，但至关重要的部分。