Soil moisture, physical and chemical properties coincident with airborne SAR data collections for 2017 and 2019, Seward Peninsula, Alaska

Soil samples were collected coincident with in-situ soil moisture and thaw depth measurements at NGEE Arctic study sites on the Seward Peninsula, Alaska in August 2017 and 2019 Field measurements and flights were conducted during both summers as a collaboration between the NASA ABoVE Project's Airborne SAR Campaign and the NGEE Arctic Project. Airborne overflights of L-band SAR instruments occurred during the soil sampling periods. Laboratory measurements of soil properties include bulk density, volumetric and gravimetric water content, carbon and nitrogen content, and particle size of mineral components. Soil samples processed and reported in this dataset were collected coincident with in situ measurements of soil moisture and thaw depth and airborne P-band and L-band SAR measurements as a collaboration between NGEE Arctic and NASA ABoVE. Contained in this dataset are four .csv data files (including data dictionaries) and one zipped folder of *.pdf files. The Next-Generation Ecosystem Experiments: Arctic (NGEE Arctic), was a research effort (with some overlap with Covid-19 pandemic) 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).

2017年与2019年8月，研究团队在阿拉斯加苏厄德半岛的下一代北极生态系统实验（Next-Generation Ecosystem Experiments: Arctic, NGEE Arctic）研究站点采集了土壤样品，采样过程同步开展了原位土壤湿度与解冻深度测量。两个夏季的野外测量与飞行任务由NASA ABoVE项目的机载合成孔径雷达（Synthetic Aperture Radar, SAR）科考活动与NGEE Arctic项目合作完成。土壤采样时段内同步开展了L波段合成孔径雷达仪器的机载飞越作业。实验室测得的土壤属性包括容重、体积含水量与重量含水量、碳氮含量以及矿物组分粒径。本数据集所处理并发布的土壤样品，采集时同步开展了原位土壤湿度、解冻深度测量以及机载P波段与L波段合成孔径雷达测量，该数据集由NGEE Arctic与NASA ABoVE合作完成。本数据集包含4个.csv数据文件（含数据字典）以及1个压缩的*.pdf文件文件夹。下一代北极生态系统实验（Next-Generation Ecosystem Experiments: Arctic, NGEE Arctic）是一项研究计划，实施期间与新冠疫情存在部分重叠，其目标是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，降低地球系统模型的不确定性。该项目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）位于阿拉斯加乌特恰维克（原名为巴罗）附近北坡的巴罗环境观测站（Barrow Environmental Observatory, BEO）内的北极多边形苔原沿海区域；2）阿拉斯加诺姆以北苏厄德半岛的不连续多年冻土区域内的多个区域。通过观测、实验以及与现有数据集的综合分析，NGEE Arctic为多尺度建模提供了增强的知识库，并助力美国能源部地球系统模型——能源极端尺度地球系统模型（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改进了过程表征。