Active Layer Depth or Permafrost Presence for the Regional Site Network.

Between 2011 and 2015, maximum active layer depth was measured during the fall at the majority of the sites in the Regional Site Network (RSN). Efforts were focused mainly on identifying which sites did and did not have frozen ground. To augment this dataset, older measurements were included for some mature sites at which the maximum active layer depths can be assumed to be fairly static. Due to time constraints, sites which we were confident had no frozen ground were not probed.2011至2015年间，研究团队于秋季对区域站点网络（Regional Site Network, RSN）内多数站点的最大活动层厚度（active layer depth）开展了实地测量。本次研究的核心目标为甄别各站点是否赋存冻土层。为扩充本数据集规模，研究团队纳入了部分成熟站点的历史观测数据——这类站点的最大活动层厚度可视为相对稳定。受限于时间条件，对于已确认无冻土层的站点，研究团队未开展相关探测工作。