Active layer thickness in the watershed of the Yukon River (Indigenous Observation Network), 2020.

The dataset presents results of measurements of the thickness of the active layer (ALT) as a part of a continuation of the Indigenous Observing Network (ION) project (ION 2.0) led by the Yukon River Intertribal Watershed Council (YRITWC) in partnership with the University of Alaska-Fairbanks. ION 2.0 continues the measurements of water quality constituents and expands the observation and monitoring program to include measurements of changes in the state of permafrost due to dynamics of the ALT at numerous of the long-term water quality monitoring sites at the communities along the Yukon River. The ION project has documented the long-term changes in major ion chemistry that have occurred over three decades throughout the Yukon River Watershed. The investigators have interpreted these changes as being driven by thawing of discontinuous permafrost throughout this large Arctic watershed and complementary measurements of the active layer will support further interpretation and modelling. This project involves significant co-production of knowledge with members of Indigenous communities and capacity building through training in sampling methods, and sample and data analysis.

本数据集收录了活性层厚度（active layer thickness, ALT）的测量结果，作为育空河跨部落流域委员会（Yukon River Intertribal Watershed Council, YRITWC）与阿拉斯加费尔班克斯大学合作牵头的原住民观测网络（Indigenous Observing Network, ION）2.0项目的延续研究内容。该项目延续了原有水质组分的测量工作，并将观测与监测范畴拓展至育空河沿岸社区的多个长期水质监测点位，新增了针对活性层动态变化引发的永久冻土状态变化的测量。ION项目已完整记录了育空河流域三十余年间主要离子化学的长期演变特征，研究人员将这些变化归因于这片大型北极流域内不连续永久冻土的消融；而活性层的配套测量将为后续的演变解读与模型构建提供关键支撑。本项目与原住民社区成员开展了深度知识共创，并通过采样方法、样本与数据分析相关培训完成了能力建设工作。