AC_Active_layer

Active layer is measured in the vicinity of the Automatic chambers in 'Rylekæret' in the Zackenberg valley. The reported active layer depths are in relation to the ground surface, the position of which changes over the season due to swelling and drying of the peat. Active layer is measured to the top of a metal rod that has been fixed in the permafrost. After the season the active layer in relation to the ground surface is computed based on relative levels between fix metal rods and the ground surface.
Measurements were initiated in 2006. From 2006 - 2010 the active layer was only measured between chamber 1 and 2. In 2011 the active layer was also measured between chamber 5 and 6. From 2012 and onwards measurements have been conducted in the vicinity of each chamber at the site.
No active layer measurements are published for 2014, due to poor data quality.

活动层（active layer）的观测点位设于扎科本山谷（Zackenberg valley）内"Rylekæret"区域的自动观测舱（Automatic chambers）周边。本次报告的活动层深度以地面为基准面，而地面位置会因泥炭的膨胀与干燥随季节发生变化。活动层厚度通过读取固定于多年冻土（permafrost）中的金属标杆顶端至活动层的距离进行测量。观测季结束后，研究人员将基于固定金属标杆与地面之间的相对高程，计算得到以地面为基准的活动层厚度。
本次观测项目于2006年启动。2006年至2010年间，仅在1号与2号观测舱之间开展活动层观测；2011年新增5号与6号观测舱之间的观测工作；2012年及以后，观测范围扩展至场地内每一座观测舱的周边区域。
2014年的活动层观测数据因数据质量不佳，未予公开发布。