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

描述北冰洋生态系统的数学模型可以作为气候变化的早期预警预测器，并加强对北极地区变化如何影响全球碳预算的理解。 科学家们通过年度碳预算在全球、区域和地方范围内跟踪碳，其中包括源（收入）和汇（损失或支出）。来自北方永久冻土区流域排水河流的有机碳是北极碳收支的重要组成部分。然而，这种碳源在现有的北冰洋模型中表现不佳。在永冻土融化的背景下，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照和养分供应。该奖学金将允许PI和一名研究生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，以开发北冰洋河流溶解有机物动态和地球系统模型的改进模型。此外，它将使PI从大陆架/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。这项研究将有助于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研究人员提供宝贵的资源。除了建立合作关系外，该研究金还将加强学生培训。新的研究技能和与LANL人员的合作伙伴关系将提高PI？的职业轨迹，加强阿拉斯加大学费尔班克斯（UAF）和LANL之间的合作，并建立在UAF？作为北极研究的卓越中心，它享有盛誉。溶解有机碳的河流输入在北极大陆架的碳循环中起着重要的作用;然而，它在目前的北冰洋模型中表现得很差。 该项目将改进与河流溶解有机物输入有关的生物地球化学过程的表现形式，以更好地评估气候变化对北极沿海地区生物泵和碳固存的潜在影响。现有的北极河流碳观测结果将用于开发与北极主要河流相对应的模型驱动程序，以纳入由设在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。该项目还将产生一个改进的代表性溶解有机碳化合物内的LANL的地球化学成分？的高纬度（HiLAT）模式。 模型模拟将帮助研究人员评估初级生产力的强度是否以及如何。更新后的模型将用于帮助研究确定河流DOM浓度对北极沿海地区生物泵强度的影响。具体而言，在每年的初级生产的变化，以及每年出口到底栖生物的碳，在每个北极大陆架将量化为目前和未来可能的河流DOM输入。将计算年度碳预算，并用于确定北极大陆架碳净通量未来可能的变化，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.