Carbon gas dynamics in aquatic ecosystems: integrating physical processes and biogeochemical cycling

水生生态系统中的碳气体动力学：整合物理过程和生物地球化学循环

• 批准号: RGPIN-2016-06378
• 负责人: Prairie, Yves
• 金额: $ 4.35万
• 依托单位: Université du Québec à Montréal
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=662557
• 关键词: Carbon; gas; dynamics; aquatic; ecosystems

The central goal of my research is to establish a solid quantitative framework to assess the role of inland waters in landscape C budgets, from local to global. Recent research by our group and elsewhere has identified CH4 as a significant player. Owing to the much more complex nature of the biogeochemical cycling of methane relative to CO2, estimates of its current contribution to total GHG emissions are still loosely constrained. However, with its high warming potential and temperature sensitivity, its future role is potentially much more important but even less foreseeable. I contend that part the difficulty in assessing and predicting its contribution is the lack of a physical-biogeochemical framework in which to integrate the main fluxes, namely production pathways, transport mechanisms, degree of oxidation and ultimately evasion to the atmosphere. The proposed research program is articulated around several sub-projects focussing on methane dynamics with an emphasis on the role played by physical constraints impinging on the rates of biogeochemical processes. The study will first be conducted on a model lake (L. Croche) and then be extended to a cross section of representative lakes covering gradients of ecosystem size, shape and nutrient status. We will also conduct detailed investigations to further our understanding of a key component of emission, gas exchange (k600), with an emphasis on the ecological role it plays. Together, these components of the research program will provide the necessary framework to better understand CH4 dynamics in lakes that will ultimately lead to the better predictions of CH4 emission from aquatic ecosystems. **

我的研究的中心目标是建立一个坚实的定量框架，以评估内陆沃茨在景观C预算中的作用，从地方到全球。我们小组和其他地方最近的研究已经确定CH 4是一个重要的参与者。由于甲烷相对于CO2的生物地球化学循环的性质要复杂得多，目前对甲烷在温室气体排放总量中所占比例的估计仍然受到宽松的限制。然而，由于其高升温潜能值和温度敏感性，其未来的作用可能要重要得多，但更不可预见。我认为，在评估和预测其贡献的困难的一部分是缺乏一个物理-地球化学框架，其中整合的主要通量，即生产途径，运输机制，氧化程度，并最终逃逸到大气中。拟议的研究计划是围绕几个子项目，重点是甲烷动力学的物理约束冲击的地球化学过程的速率所发挥的作用。这项研究将首先在一个模型湖（L。Croche），然后扩展到代表性湖泊的横截面，涵盖生态系统大小，形状和营养状况的梯度。我们还将进行详细的调查，以进一步了解排放的关键组成部分，气体交换（k600），重点是它所发挥的生态作用。总之，研究计划的这些组成部分将提供必要的框架，以更好地了解CH 4在湖泊中的动态，最终导致更好地预测CH 4从水生生态系统的排放。**