The past, present and future greenhouse gas (GHG) footprint of lakes: from biogeochemical processes to large scale upscaling

湖泊过去、现在和未来的温室气体 (GHG) 足迹：从生物地球化学过程到大规模升级

• 批准号: RGPIN-2022-04110
• 负责人: Prairie, Yves
• 金额: $ 3.13万
• 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: 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=765232
• 关键词: past; present; future; greenhouse; gas

The overarching goal of my NSERC Discovery Grant research program is the development a robust quantitative framework to assess the role of inland waters in landscape carbon and greenhouse gas (GHG) budgets, from local to regional to global. While CO2 is typically the dominant form in which lakes emit carbon to the atmosphere, the higher warming potential of methane (CH4) renders their impact on radiative forcing about co-equal. However, given the more complex nature of the biogeochemical cycling of methane relative to CO2, estimates of the contribution of CH4 to total GHG emissions is much more variable and poorly constrained. The specific objectives of this proposal are focused on methane and aim 1) to test a new model describing sediment CH4 production and its partitioning between ebullitive and diffusive fluxes, 2) to establish the quantitative relationship between sediment CH4 production and other lake characteristics (in particular, trophic status and temperature) on a broad set of lakes, 3) continue the development of a novel coupled physical-biogeochemical model (PB-GHG) and its validation using both a multi-lake and within-lake approaches, 4) apply the PB-GHG model to evaluate by how much the GHG footprint of Canadian lakes has changed over the past 70 years and by how much it is likely to change further under different scenarios of climate change and eutrophication. Together, these projects, combined our previous work, will provide the most comprehensive framework to better predict the dynamics of CH4 in lakes.

我的NSERC发现补助金研究计划的总体目标是开发一个强大的定量框架，以评估内陆水域在景观碳和温室气体（GHG）预算中的作用，从本地到区域到全球。尽管二氧化碳通常是湖泊将碳发射到大气中的主要形式，但甲烷（CH4）的更高变暖潜力使其对辐射强迫的影响强迫大约相等。但是，鉴于甲烷相对于CO2的生物地球化学循环的更为复杂的性质，CH4对总温室气体排放的贡献的估计值差异要多得多且约束较差。 The specific objectives of this proposal are focused on methane and aim 1) to test a new model describing sediment CH4 production and its partitioning between ebullitive and diffusive fluxes, 2) to establish the quantitative relationship between sediment CH4 production and other lake characteristics (in particular, trophic status and temperature) on a broad set of lakes, 3) continue the development of a novel coupled physical-biogeochemical model (PB-GHG) and its validation using多湖区和湖内方法，4）使用PB-GHG模型来评估加拿大湖泊在过去70年中的温室植物占地面有的变化，以及在气候变化和富营养化的不同情况下可能会进一步变化的程度。这些项目共同结合了我们以前的工作，将提供最全面的框架，以更好地预测湖泊中CH4的动态。