Submarine Permafrost Map (SuPerMAP), modeled with CryoGrid 2, Circum-Arctic

This data set contains a first‐order estimate of distribution, thickness and ice-content of submarine permafrost on the Arctic shelf based on a numerical heat transfer model. Our model uses dynamic upper boundary conditions that synthesize Earth System Model air temperature, ice mass distribution and thickness, and global sea level reconstruction and applies globally distributed geothermal heat flux as a lower boundary condition. Sea level reconstruction accounts for differences between marine and terrestrial sedimentation history. Sediment composition and pore water salinity are integrated in the model. Model runs for 450 thousand (ka) for cross‐shelf transects were used to initialize the model for circumarctic modeling for the past 50 ka.This data set consists of current sea levels, and permafrost depth [meters below sea floor (m bsf)], total ice-content in meters cubed per meters squared [m³ / m²] and enthalpy in megajoules per meter squared [MJ / m²] at times 50ka, 25ka and 0a before industrialization for 15892 locations on the Arctic shelf. Additionally zonations for permafrost depth and ice-content are given as layer files. Based on the undertaken sensitivity studies zones with less than 100 meter (m) permafrost are uncertain, zones with 100-300 m are probable, and zones with greater than 300 m are confident.本数据集基于数值传热模型，给出了北极陆架海底多年冻土的分布、厚度与含冰量的一阶估算结果。本模型采用动态上边界条件，整合了地球系统模式（Earth System Model）的气温、冰体分布与厚度数据，以及全球海平面重建数据，并以全球分布式地热热流作为下边界条件。其中海平面重建数据考量了海洋与陆地沉积历史之间的差异。模型中还整合了沉积物组成与孔隙水盐度参数。为开展北极周边过去5万年（ka）的模拟研究，本研究先针对跨陆架断面开展了45万年的模型运行以完成模型初始化。 本数据集涵盖北极陆架15892个采样点位在工业化前50ka、25ka及0年的当前海平面数据、冻土深度[单位：海底以下米（m bsf）]、单位面积总含冰量[单位：立方米每平方米（m³/m²）]以及单位面积焓[单位：兆焦每平方米（MJ/m²）]。此外，数据集还提供了冻土深度与含冰量的分区图层文件。基于本次开展的敏感性研究，冻土深度小于100米的区域结果存在不确定性，100米至300米的区域结果为大概率可靠，而大于300米的区域结果则置信度较高。