Seasonal soil active layer measurements from a Circumpolar Active Layer monitoring (CALM) grid, (U32B) Sagwon Hills MAT, Alaska, 1995-2024

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.本站点为环极活动层监测（Circumpolar Active Layer Monitoring, CALM）计划注册站点，隶属于一个协同推进冻融测量数据标准化采集与共享的观测网络，该网络的所有站点均选址于具有代表性的未受干扰多年冻土景观。本数据集包含采用机械探测法获取的长期空间解冻深度观测数据，观测日期由文件列标题标注。为保障数据集记录的相对一致性，季末测量均安排在解冻盛期（8月中旬至9月中旬）的同一儒略历周内。需要注意的是，被定义为活动层厚度的年最大解冻深度，会因年份与站点的不同而存在差异。