Seasonal soil active layer measurements from a Circumpolar Active Layer monitoring (CALM) grid, (U56) 56 Mile, Alaska, 1996-2024

This site is registered with the Circumpolar Active Layer Monitoring (CALM) program. It is one among a network of sites that represent a coordinated effort to standardize the collection and access to thaw measurements in representative undisturbed permafrost landscapes. This dataset contains long-term spatial thaw depth observations using mechanical probing on dates indicated by file column headers. To ensure relative consistency within the record, end-of-season measurement dates are within the same Julian calendar week during the height of the thaw season (mid-August to mid-September). It is important to note that the date of maximum annual thaw, interpreted as the active layer thickness, can vary from year to year and between sites.本站点已注册加入环极活动层监测（Circumpolar Active Layer Monitoring, CALM）计划。其隶属于一个协同网络，该网络旨在统一规范典型未受干扰多年冻土景观中融深测量数据的采集与共享流程，实现标准化管理。本数据集包含通过机械探杆法获取的长期空间融深观测数据，观测日期由文件列标题标注。为保障记录内部的相对一致性，季末测量日期均落在融盛期（8月中旬至9月中旬）的同一儒略周内。需特别指出，作为活动层厚度表征指标的年最大融深日期，会因年份与站点的不同而存在差异。