Seasonal soil active layer measurements from a Circumpolar Active Layer Monitoring (CALM) project for site 'Toolik MAT' (U12 B), Alaska North Slope, United States (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.

本站点已注册加入环极活动层监测（Circumpolar Active Layer Monitoring, CALM）计划。本站点隶属于一个协同搭建的监测网络，该网络致力于标准化冻融测量数据的采集与共享流程，并覆盖典型未受干扰的永久冻土（permafrost）景观。本数据集包含通过机械探杆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，季末测量日期均落在解冻盛期（8月中旬至9月中旬）的同一儒略历周内。需特别说明的是，年最大解冻发生的日期（该日期对应的解冻深度被认定为活动层厚度），会随年份与监测站点的不同而存在差异。