Seasonal soil active layer measurements from a Circumpolar Active Layer monitoring (CALM) grid, (U11a) Imnavait Creek 1 kilometer grid, Alaska, 1995-2023

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。该站点隶属于一个协同搭建的监测网络，其核心目标是统一标准化典型未受干扰多年冻土（permafrost）景观内解冻深度测量的采集流程与数据获取方式。本数据集包含通过机械探杆测量法获取的长期空间解冻深度观测数据，具体观测日期由文件列标题标注。为保障数据集内部数据的相对一致性，季末测量均定于解冻盛期（8月中旬至9月中旬）的同一儒略历周内开展。需特别说明的是，作为活动层厚度表征依据的年度最大解冻日期，会因年份与监测站点的不同而存在差异。