Scheinert M, Ferraccioli F, Schwabe J, Bell R, Studinger M, Damaske D, Jokat W, Aleshkova N, Jordan T, Leitchenkov G, Blankenship D D, Damiani T M, Young D, Cochran J R, Richter T D
Institut für Planetare Geodäsie, Technische Universität Dresden, Dresden, Germany.
British Antarctic Survey, High Cross, Madingley Road, Cambridge, UK.
Geophys Res Lett. 2016 Jan 28;43(2):600-610. doi: 10.1002/2015GL067439. Epub 2016 Jan 21.
Gravity surveying is challenging in Antarctica because of its hostile environment and inaccessibility. Nevertheless, many ground-based, airborne and shipborne gravity campaigns have been completed by the geophysical and geodetic communities since the 1980s. We present the first modern Antarctic-wide gravity data compilation derived from 13 million data points covering an area of 10 million km, which corresponds to 73% coverage of the continent. The remove-compute-restore technique was applied for gridding, which facilitated levelling of the different gravity datasets with respect to an Earth Gravity Model derived from satellite data alone. The resulting free-air and Bouguer gravity anomaly grids of 10 km resolution are publicly available. These grids will enable new high-resolution combined Earth Gravity Models to be derived and represent a major step forward towards solving the geodetic polar data gap problem. They provide a new tool to investigate continental-scale lithospheric structure and geological evolution of Antarctica.
由于南极洲环境恶劣且难以到达，重力测量极具挑战性。尽管如此，自20世纪80年代以来，地球物理和大地测量学界已经完成了许多地面、航空和船载重力测量活动。我们展示了首个覆盖整个南极洲的现代重力数据汇编，该汇编源自1300万个数据点，覆盖面积达1000万平方公里，相当于该大陆73%的覆盖率。在网格化过程中应用了移除-计算-恢复技术，这有助于将不同的重力数据集相对于仅从卫星数据得出的地球重力模型进行水准测量。由此生成的分辨率为10公里的数据自由空气重力异常网格和布格重力异常网格已公开提供。这些网格将能够得出新的高分辨率联合地球重力模型，代表着在解决大地测量极地数据缺口问题方面向前迈出了重要一步。它们为研究南极洲大陆尺度岩石圈结构和地质演化提供了新工具。
