Seasonal soil active layer measurements from a Circumpolar Active Layer monitoring (CALM) grid, (U56) 56 Mile, Alaska, 1996-2023

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。本站点属于一个站点网络的组成部分，该网络通过协调统一的工作，实现对典型未受干扰永久冻土景观区域内融化观测数据的采集与获取流程的标准化。本数据集包含基于机械探杆测量得到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高峰期（8月中旬至9月中旬）的同一儒略历周内。需要注意的是，代表活动层厚度的年度最大解冻日期，会因年份与站点的不同而存在差异。