Lake biogeochemical dynamics: the conveyor belt between physics and biology

湖泊生物地球化学动力学：物理学与生物学之间的传送带

• 批准号: RGPIN-2019-04217
• 负责人: Couture, RaoulMarie
• 金额: $ 2.19万
• 依托单位: Université Laval
• 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=748665
• 关键词: Lake; biogeochemical; dynamics; conveyor; belt

The proposed research program focuses on coupled biogeochemical cycles in northern lakes. The context of this research is that water quality in lakes is impacted by multiple stressors, causing geochemical and ecological changes in lakes. Such stressors include climate change (impacting temperature, irradiance, wind and precipitation), and changing loads of elements. We lack the knowledge and quantitative tools to predict lake responses to these ongoing changes, which limits our capacity to act to either prevent or mitigate their deterioration. Our aim is to acquire, using data and models, a quantitative understanding of the complex interplay between coupled biogeochemical cycles and their responses to external and internal pressures affecting lakes. Students with backgrounds in chemistry, biology, bioinformatics and engineering will be provided with research opportunities and an international outlook. The overarching objective of the research program is to understand the response of coupled biogeochemical cycles in lakes to multiple pressures across spatial scales. It will focus on the cycles of chemical elements, namely carbon (dissolved and particulate C, CO2 and CH4), O, nutrients (P and N), metals (Fe, Mn and Al) and trace elements (e.g., As, Se, Mo). From a theoretical standpoint, we are interested in identifying the network of coupled processes in biogeochemical cycles that sustain water quality in contrasting lakes, and in quantifying how future lake functioning depends on their past history. Using models, we will disentangle changing external environmental pressures from accumulated internal pressures. The proposed research activities are distributed across three themes: (1) the sedimentary geochemistry of lakes affected by external and internal nutrient loads, (2) the response of lake oxygen dynamics, and in particular seasonal anoxia, to irradiance, ice phenology and organic matter loads along a latitudinal bioclimatic gradient reaching the Canadian arctic, and (3) the process-oriented modelling of physical and biogeochemical lake dynamics at the regional scale.

拟议的研究计划侧重于北部湖泊中的耦合生物地球化学循环。本研究的背景是，湖泊水质受到多种应激源的影响，导致湖泊的地球化学和生态变化。这些应激源包括气候变化(影响温度、辐照度、风和降水)和变化的元素负荷。我们缺乏知识和量化工具来预测湖泊对这些持续变化的反应，这限制了我们采取行动防止或减轻它们恶化的能力。我们的目标是利用数据和模型，定量地了解耦合的生物地球化学循环及其对影响湖泊的外部和内部压力的反应之间的复杂相互作用。具有化学、生物、生物信息学和工程学背景的学生将获得研究机会和国际视野。该研究计划的首要目标是了解湖泊中耦合的生物地球化学循环对空间尺度上的多个压力的响应。它将侧重于化学元素的循环，即碳(溶解和颗粒碳、二氧化碳和甲烷)、氧、营养物质(P和N)、金属(Fe、Mn和Al)和微量元素(例如As、Se、Mo)。从理论上讲，我们感兴趣的是确定生物地球化学循环中维持不同湖泊水质的耦合过程网络，以及量化未来湖泊功能如何依赖于它们过去的历史。使用模型，我们将把不断变化的外部环境压力从累积的内部压力中解脱出来。拟议的研究活动涉及三个主题：(1)受外部和内部营养物质负荷影响的湖泊的沉积地球化学；(2)湖泊氧气动态，特别是季节性缺氧对沿着到达加拿大北极的纬度生物气候梯度的辐射、冰物候和有机物质负荷的响应；(3)在区域尺度上以过程为导向的湖泊物理和生物地球化学动态模拟。