Characterization of decade-time scale change in Retrogressive Thaw Slumps across Northern Alaska, 2021-2023

Delineations of Retrogressive Thaw Slump (RTS) expansion and light detection and ranging (LiDAR) datasets (LAS files) of RTS sites were used to model how rates of RTS change are influenced by topographic and climatic characteristics across northern Alaska. LiDAR data were collected at ten sites, where five were collected from an uncrewed aerial system (UAS) and five were collected from a terrestrial LiDAR systems (TLS). LiDAR datasets were used to bias correct the open-source ArcticDEM (2 meter-resolution) for calculating annual rates of RTS volumetric losses across all sites. RTS Delineations were used to calculate annual rates of RTS areal expansion and summarize topographic characteristics calculated from the corrected ArcticDEM. Two shapefiles were created from historic satellite and aerial imagery (1949-2021) to summarize RTS areal change across 66 slumps, located in the Brooks Foothills (n=28) and the Noatak River Valley (n=38): AK_brf_noat_RTS_ExansionDelineations.shp summarizes the area of RTS expansion between two time periods and AK_brf_noat_RTS_Delineations.shp summarizes the total RTS outline in each year where RTS expansion occurs. LiDAR UAS and TLS data are provided as LAS files from 12 slumps (five sites) near Toolik Lake and 9 slumps (5 sites) within the Noatak National Preserve.本研究采用热融滑塌（Retrogressive Thaw Slump, RTS）扩张范围矢量数据与RTS监测点的激光雷达（light detection and ranging, LiDAR）数据集（LAS格式文件），对阿拉斯加北部区域内RTS变化速率受地形与气候特征影响的机制开展建模分析。本次研究共在10个监测点采集LiDAR数据，其中5个站点采用无人机系统（uncrewed aerial system, UAS）获取数据，剩余5个站点采用地面激光雷达系统（terrestrial LiDAR systems, TLS）完成数据采集。本研究利用LiDAR数据集对开源北极数字高程模型（ArcticDEM，2米分辨率）进行偏差校正，以此计算所有监测点的RTS体积损失年速率。通过RTS范围矢量数据，可计算RTS面积扩张的年速率，并汇总基于校正后ArcticDEM提取的地形特征参数。本研究基于1949-2021年的历史卫星与航空影像，构建了两个形状文件以汇总66处滑塌体的RTS面积变化情况：其中28处滑塌体位于布鲁克斯山麓，38处位于诺阿塔克河谷。文件AK_brf_noat_RTS_ExansionDelineations.shp用于统计两个时间区间内的RTS扩张面积，AK_brf_noat_RTS_Delineations.shp则用于汇总发生RTS扩张的各年份中RTS的总轮廓范围。本次公开的LiDAR数据包含UAS与TLS两种采集类型，均以LAS文件格式提供，其中12处滑塌体（对应5个监测点）的数据采集于图利克湖周边区域，剩余9处滑塌体（对应5个监测点）的数据采集于诺阿塔克国家保护区内。