Active Layer Depth MISP (Mobile Instrumented System Platform) and CALM (Circumpolar Active Layer Monitoring) grids in Barrow and Atqasuk, Alaska, 2018

Active layer depth measurements were collected during the 2018 growing season at each Circumpolar Active Layer Monitoring (CALM) grid subset plot (30) and at each Mobile Instrumented System Platform (MISP). Both of these grids are located at Utqiaġvik (formerly Barrow), Alaska as well as in Atqasuk, Alaska. For CALM measurements, at each plot two active layer depth measurements were acquired, the date, start and end times, and the people present were also recorded. Active layer depth measurements were taken outside of every plot on the northeastern most corner in order to reduce disturbance of vegetation. For MISP measurements, at each grid meter two active layer depth measurement were acquired, the date, start and end times, and the people present were also recorded. Active layer depth measurements were taken on the north side of the grid in order to reduce disturbance of vegetation. These measurements are part of the Arctic Observing Network (AON) - International Tundra Experiment (ITEX) initiative and help to document seasonal changes in surface moisture and structure at high spatial scales.

本数据集采集了2018年生长季期间，于环极活动层监测（Circumpolar Active Layer Monitoring, CALM）网格子集样地（共30个）以及每个移动监测系统平台（Mobile Instrumented System Platform, MISP）处获取的活动层厚度测量数据。上述两类监测网格均设置于阿拉斯加州乌特恰维克（原名为巴罗）与阿拉斯加州阿特萨斯克两地。

针对CALM测量数据，每个样地均采集2组活动层厚度测量值，同时记录测量日期、起止时间及在场人员信息。为减少对植被的干扰，活动层厚度测量点位设于每个样地的东北最外侧角落。

针对MISP测量数据，每网格米范围内均采集2组活动层厚度测量值，同时记录测量日期、起止时间及在场人员信息。为减少对植被的干扰，活动层厚度测量点位设于网格北侧区域。

本批测量数据隶属于北极观测网络（Arctic Observing Network, AON）-国际苔原实验（International Tundra Experiment, ITEX）计划，用于辅助记录高空间分辨率下地表湿度与结构的季节变化特征。