Antarctic geothermal heat flux distribution and estimated Curie Depths, links to gridded files

Antarctica is the largest reservoir of ice on Earth. Understanding its ice sheet dynamics is crucial to unraveling past global climate change and making robust climatic and sea level predictions. Of the basic parameters that shape and control ice flow, the most poorly known is geothermal heat flux. Direct observations of heat flux are difficult to obtain in Antarctica, and until now continent-wide heat flux maps have only been derived from low-resolution satellite magnetic and seismological data. We present a high resolution heat flux map and associated uncertainty derived from spectral analysis of the most advanced continental compilation of airborne magnetic data. Small-scale spatial variability and features consistent with known geology are better reproduced than in previous models, between 36% and 50%. […]

南极洲乃地球上最大的冰储之地。洞察其冰盖动力学对于揭示过往全球气候变化以及制定坚实的气候和海平面预测至关重要。在塑造与控制冰流的基本参数中，地质热流的信息最为匮乏。在南极洲，直接获取热流观测数据颇为不易，迄今为止，全国范围内的热流图仅能从低分辨率的卫星磁性和地震数据中推导得出。本团队呈现一幅高分辨率热流图及其相关不确定性，该图基于对最先进的航空磁数据汇编进行的频谱分析。相较于以往模型，小尺度空间变异性以及与已知地质相吻合的特征得到了更好的再现，介于36%至50%之间。