Results of Experimental Additions of Organic Nitrogen on Soil Organic Matter Decomposition, Teller Road Site, Seward Peninsula, 2017 and 2018

This dataset provides the results of the experimental addition of glutamic acid on anaerobic organic matter decomposition as measured in the field and through laboratory methods. Field experiments were conducted during the summers of 2017 and 2018 at the NGEE Arctic Teller Road Site at mile marker 27 (TL_MM27) near Intensive Site 9 (TL_IS_9). At the field site, a solution of glutamate (13C- and 15N-labeled glutamate in 2017, unlabeled in 2018) was injected belowground and investigators observed the resulting changes in downslope porewater geochemistry and dissolved greenhouse gas concentrations. Soil collected near the site in 2017 was used in a laboratory column flow-through experiment with added glutamate. Results of porewater geochemistry, dissolved greenhouse gasses, and organic matter composition analyses for 2017 and 2018 experiments are provided. There are six *.csv data files and one *.pdf user guide.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).

本数据集提供了通过野外和实验室方法测定的谷氨酸添加对厌氧有机质分解影响的实验结果。野外实验于2017年和2018年夏季在NGEE北极泰勒路站点（27英里标记处，TL_MM27）进行，该站点靠近9号密集研究点（TL_IS_9）。在野外站点，研究人员将谷氨酸溶液（2017年为13C和15N标记的谷氨酸，2018年为未标记谷氨酸）注入地下，并观测下坡孔隙水地球化学特征及溶解性温室气体浓度的变化。2017年从站点附近采集的土壤被用于添加谷氨酸的实验室柱流实验。本数据集包含2017年和2018年实验中孔隙水地球化学、溶解性温室气体及有机质组成分析的结果，共包含6个*.csv数据文件和1个*.pdf用户指南。下一代生态系统实验：北极（NGEE Arctic）是一项旨在通过建立对富碳北极生态系统及其气候反馈的预测性理解，从而降低地球系统模型不确定性的研究项目。NGEE Arctic由美国能源部生物与环境研究办公室资助。NGEE Arctic项目设有两个野外研究站点：1）位于阿拉斯加巴罗环境观测站（BEO）的北极多边形冻土沿海区域及乌特恰维克（巴罗）附近的北坡；2）位于阿拉斯加诺姆以北苏厄德半岛的不连续多年冻土区域的多个地点。通过观测、实验及现有数据集的综合分析，NGEE Arctic为多尺度建模提供了强化知识库，并助力改进美国能源部地球系统模型（能源百亿亿次地球系统模型，E3SM）中全球泛北极尺度的过程表征，尤其是E3SM陆面模型组件（ELM）中的相关表征。