Modeling Anaerobic Soil Organic Carbon Decomposition in Arctic Polygon Tundra: Insights into Soil Geochemical Influences on Carbon Mineralization: Modeling Archive

This anaerobic carbon decomposition model framework was developed with explicit representation of fermentation, methanogenesis and iron reduction by combining three well-known modeling approaches developed in different disciplines. A pool-based model to represent upstream carbon transformations and replenishment of dissolved organic carbon (DOC) pool, a thermodynamically-based model to calculate rate kinetics and biomass growth for methanogenesis and Fe(III) reduction, and a humic ion-binding model for aqueous phase speciation and pH calculations. The combined models are implemented in the open source geochemical model PHREEQC (V3.0). Installation of PHREEQC is required to run this model. This dataset contains one zipped file and one pdf.The Next-Generation Ecosystem Experiments: Arctic (NGEE Arctic), was a research effort to reduce uncertainty in Earth System Models by developing a predictive understanding of carbon-rich Arctic ecosystems and feedbacks to climate. NGEE Arctic was supported by the Department of Energy's Office of Biological and Environmental Research.The NGEE Arctic project had two field research sites: 1) located within the Arctic polygonal tundra coastal region on the Barrow Environmental Observatory (BEO) and the North Slope near Utqiagvik (Barrow), Alaska and 2) multiple areas on the discontinuous permafrost region of the Seward Peninsula north of Nome, Alaska.Through observations, experiments, and synthesis with existing datasets, NGEE Arctic provided an enhanced knowledge base for multi-scale modeling and contributed to improved process representation at global pan-Arctic scales within the Department of Energy's Earth system Model (the Energy Exascale Earth System Model, or E3SM), and specifically within the E3SM Land Model component (ELM).

本厌氧碳分解模型框架整合了不同学科开发的三种经典建模方法，实现了发酵、产甲烷作用与铁还原过程的明确表征。其中包括用于表征上游碳转化过程与溶解性有机碳（dissolved organic carbon, DOC）库补给的基于库的模型、用于计算产甲烷作用与三价铁（Fe(III)）还原过程速率动力学及微生物生物量生长的基于热力学的模型，以及用于水相形态分布与pH值计算的腐殖质离子结合模型。本组合模型已在开源地球化学模型PHREEQC（V3.0）中实现，运行本模型需预先安装PHREEQC。本数据集包含1个压缩文件与1个PDF文档。下一代北极生态系统实验（Next-Generation Ecosystem Experiments: Arctic, NGEE Arctic）是一项旨在通过深化对富碳北极生态系统的预测性认知及其气候反馈机制的理解，降低地球系统模型不确定性的研究项目。该项目由美国能源部生物与环境研究办公室资助。下一代北极生态系统实验项目设有两个野外研究站点：1）位于阿拉斯加州乌特恰维克（原巴罗）附近北坡地区的巴罗环境观测站（Barrow Environmental Observatory, BEO）内的北极多边形苔原沿海区域；2）阿拉斯加州诺姆以北苏厄德半岛不连续多年冻土区的多个区域。通过观测、实验以及与现有数据集的整合分析，本项目构建了更为完善的多尺度建模知识库，助力美国能源部地球系统模型——能源超额计算地球系统模型（Energy Exascale Earth System Model, E3SM）——尤其是其陆面模型组件（ELM），在全球泛北极尺度上优化过程表征能力。