In Situ Soil Moisture and Thaw Depth Measurements Coincident with Airborne SAR Data Collections, Seward Peninsula, Alaska, 2019

The in-situ soil moisture and thaw depth measurements provided in this dataset were collected coincident with airborne overflights of L- and P-band SAR instruments at the Teller and Kougarok NGEE Arctic study sites on the Seward Peninsula, Alaska. Field measurements and flights were conducted in August 2019 as a collaboration between the NASA ABoVE Project's Airborne SAR Campaign and the NGEE Arctic Project. ABoVE protocols for establishing field measurement plots were followed. NGEE Arctic plots for the ground-based measurements are located at existing study sites where SAR data would also add value to current monitoring and characterization efforts of the NGEE Team. The ground-based data will be used by ABoVE to analyze, calibrate and validate the remote sensing products. This dataset follows the format and collection guidelines of the collaboration effort in 2017. Contained in this dataset are *.csv (including data dictionaries), .zip, .kml, .jpgs, .py, and .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).本数据集收录的原位土壤湿度与冻深实测数据，是在阿拉斯加州苏厄德半岛的特勒（Teller）与库加罗克（Kougarok）NGEE Arctic研究站点，与L波段和P波段合成孔径雷达（SAR）航空飞越作业同步采集的。2019年8月，野外实测与航空作业由美国国家航空航天局（NASA）ABoVE项目的航空SAR行动组与NGEE Arctic项目联合开展，全程遵循ABoVE野外测量样地布设规范。本次地面实测所用的NGEE Arctic样地均设于现有研究站点，合成孔径雷达（SAR）数据可进一步提升NGEE团队当前的监测与生态特征刻画工作的价值。地面实测数据将由ABoVE项目用于遥感产品的分析、定标与验证工作。本数据集沿用了2017年双方合作项目的文件格式与数据采集规范。本数据集包含以下格式的文件：*.csv（含数据字典）、.zip、.kml、.jpgs、.py及.pdf。下一代北极生态系统实验（Next-Generation Ecosystem Experiments: Arctic, NGEE Arctic）是一项旨在降低地球系统模型不确定性的研究计划，其研究周期与新冠疫情存在部分重叠，核心目标是构建对富碳北极生态系统的预测性认知及其对气候的反馈机制。NGEE Arctic项目由美国能源部生物与环境研究办公室资助。NGEE Arctic项目设有两处野外研究站点：1）位于阿拉斯加州乌特恰维克（原巴罗）附近北坡的巴罗环境观测站（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的不连续多年冻土区的多处区域。通过实地观测、受控实验与现有数据集的综合分析，NGEE Arctic项目为多尺度建模提供了更为完善的知识库，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提升了生态过程表征的准确性。