Seasonal active layer measurements from a Circumpolar Active Layer Monitoring (CALM) grid, Barrow, Alaska, 2017

Active layer depth measurements were collected during the 2017 growing season at each Circumpolar Active Layer Monitoring (CALM) grid subset plot (30) located in Barrow, Alaska. 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. Data have been corrected by subtracting 0.5 centimeters from measurements made in the field to account for the missing tip of the probe. 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.2017年生长季期间，研究人员于阿拉斯加巴罗（Barrow）的30个极地活动层监测（Circumpolar Active Layer Monitoring, CALM）网格子集样地中采集了活动层厚度实测数据。每个样地内开展两次活动层厚度测量，同时记录测量日期、起止时刻及在场人员信息。为降低对植被的干扰，所有活动层厚度测量均设置在每个样地的最东北角外侧区域。针对探头尖端缺失带来的系统偏差，所有野外实测数据均通过减去0.5厘米完成校正。本次实测数据隶属于北极观测网（Arctic Observing Network, AON）-国际冻原实验（International Tundra Experiment, ITEX）项目，用于记录高空间分辨率下地表湿度与结构的季节变化特征。