RII Track-4: Modeling Dissolved Organic Matter at the Arctic land/ocean interface.

非技术描述描述北冰洋生态系统的数学模型可以作为气候变化的预警指标，并加强对北极地区变化如何影响全球碳收支的理解。科学家通过包括来源(收入)和汇(损失或支出)的年度碳预算，在全球、区域和地方尺度上跟踪碳。来自北部多年冻土地区分水岭排水河流的有机碳是北极碳收支的关键组成部分。然而，这种碳源在现有的北冰洋模型中表现得很差。在永久冻土融化的背景下，这些北极河流中溶解碳供应的变化可能会影响海洋化学，以及北极海洋环境中植物的光和营养的可用性。这项奖学金将使国际和平研究所和一名研究生能够与新墨西哥州洛斯阿拉莫斯国家实验室(LANL)的计算物理和方法小组建立研究合作，以开发北冰洋河流中溶解有机物动态的改进模型和地球系统模型。此外，它将使PI能够从陆架/盆地海洋动力学扩展到侧重于陆地/海洋界面的生态系统研究。这项研究将使人们能够更好地评估气候变化对北极沿海地区碳进出口的影响。这些改进的模型将为研究北极和全球碳动态的国家和国际调查人员提供宝贵的资源。除了建立合作外，该奖学金还将加强对学生的培训。新的研究技能和与LANL人员的合作伙伴关系将增强皮耶？S的职业发展轨迹，加强阿拉斯加大学费尔班克斯大学和LANL之间的合作，并巩固UAF S作为北极研究卓越中心的声誉。溶解有机碳的河流输入在北冰洋陆架的碳循环中起着重要的作用，但在目前的北冰洋模型中描述得很少。该项目将改进与河流溶解有机物质输入有关的生物地质化学过程的表现，以更好地评估气候变化对北极沿海地区生物泵和碳封存的潜在影响。对北极河流中碳的现有观测将用于开发与北极主要河流相对应的模型驱动因素，以纳入设在LANL的全球和区域气候模型高纬度应用和测试小组开发的全球地球系统模型。该项目还将改进LANL？S高纬度(HILAT)模型中生物地球化学成分中溶解的有机碳化合物的表示。模型模拟将帮助研究人员评估初级生产力和。更新后的模型将用于帮助研究人员确定北冰洋沿海地区河流DOM浓度对生物泵强度的影响。具体地说，将量化每个北极大陆架上每年初级生产量和每年向底栖动物输出的碳的可变性，以确定目前和未来可能的河流DOM输入。年度碳预算将被计算并用于确定北极大陆架上的碳净通量未来可能发生的变化，从而确定全球碳预算。

Non-technical DescriptionMathematical models that describe the Arctic Ocean ecosystem can act as early warning predictors for a changing climate, and enhance understanding of how changes in the Arctic region influence the global carbon budget. Scientists track carbon on global, regional and local scales through annual carbon budgets which include both sources (income) and sinks (loss or expenditure). Organic carbon from watershed-draining rivers in the northern permafrost region is a critical component of the Arctic carbon budget. However, this carbon source is poorly represented in existing Arctic Ocean models. In the context of thawing permafrost, changes to the dissolved carbon supply in these Arctic rivers may influence ocean chemistry, as well as the availability of light and nutrients to plants in the Arctic marine environment. This fellowship will allow the PI and a graduate student to establish a research collaboration with the Computational Physics and Methods Group at the Los Alamos National Laboratory (LANL) in New Mexico to develop improved models of the dynamics of dissolved organic matter from rivers in Arctic Ocean and Earth system models. In addition, it will enable the PI to extend from shelf/basin ocean dynamics to ecosystem research focused on the land/ocean interface. This research will enable a better assessment of the impacts of a changing climate on the import and export of carbon in Arctic coastal regions. These improved models will be valuable resources for national and international investigators studying both the Arctic and global carbon dynamics. In addition to establishing the collaboration, the fellowship will enhance student training. The new research skills and collaborative partnerships with LANL personnel will enhance the PI?s career trajectory, strengthen collaboration between the University of Alaska Fairbanks (UAF) and LANL, and build on UAF?s reputation as a center of excellence in Arctic research. Technical DescriptionThe fluvial input of dissolved organic carbon plays an important role in carbon cycling on Arctic shelves; however, it is poorly represented in current Arctic Ocean models. This project will develop improved representation of biogeochemical processes associated with riverine dissolved organic matter inputs to better assess the potential impacts of climate change to the biological pump and the sequestration of carbon in Arctic coastal regions. Existing observations of carbon in Arctic rivers will be used to develop model drivers corresponding to major Arctic rivers for incorporation into the global Earth system model developed by the High-Latitude Application and Testing of Global and Regional Climate Models team, based at LANL. This project will also yield an improved representation of dissolved organic carbon compounds within the biogeochemical component of LANL?s high latitude (HiLAT) model. Model simulations will help researchers assess whether and how the strength of primary production and. The updated model will be used to help researches determine the impact of riverine DOM concentration on the strength of the biological pump in the Arctic coastal regions. Specifically, the variability in annual primary production, and the annual export of carbon to the benthos, over each Arctic shelf will be quantified for present and likely future riverine DOM input. Annual carbon budgets will be computed and used to determine likely future changes to the net flux of carbon on Arctic shelves, and thus the global carbon budget.