Antarctic ice sheet topography, cavity geometry, and global bathymetry (RTopo 1.0.5-beta)

Sub-ice shelf circulation and freezing/melting rates in ocean general circulation models depend critically on an accurate and consistent representation of cavity geometry. Existing global or pan-Antarctic data sets have turned out to contain various inconsistencies and inaccuracies. The goal of this work is to compile independent regional fields into a global data set. We use the S-2004 global 1-minute bathymetry as the backbone and add an improved version of the BEDMAP topography for an area that roughly coincides with the Antarctic continental shelf. Locations of the merging line have been carefully adjusted in order to get the best out of each data set. High-resolution gridded data for upper and lower ice surface topography and cavity geometry of the Amery, Fimbul, Filchner-Ronne, Larsen C and George VI Ice Shelves, and for Pine Island Glacier have been carefully merged into the ambient ice and ocean topographies. […]

海洋环流模型中冰下 shelves 的环流以及冻结/融化速率的准确和一致表征对于模型至关重要。现有的全球或全南极数据集已被证实存在各种不一致性和不准确之处。本工作的目标是将独立区域数据集汇编成全球数据集。我们以 S-2004 全球 1 分钟海底地形数据为基础，并添加了改进版的 BEDMAP 地形数据，以覆盖大致与南极大陆架相对应的区域。为了从每个数据集中获得最佳效果，合并线的位置已经过精心调整。对于 Amery、Fimbul、Filchner-Ronne、Larsen C 和 George VI 冰架，以及 Pine Island 冰川的上部和下部冰面地形和 cavity 几何形状的高分辨率网格数据已与周围冰和海洋地形进行了仔细合并。 [...]（Sub-ice shelf circulation and freezing/melting rates in ocean general circulation models depend critically on an accurate and consistent representation of cavity geometry. Existing global or pan-Antarctic data sets have turned out to contain various inconsistencies and inaccuracies. The goal of this work is to compile independent regional fields into a global data set. We use the S-2004 global 1-minute bathymetry as the backbone and add an improved version of the BEDMAP topography for an area that roughly coincides with the Antarctic continental shelf. Locations of the merging line have been carefully adjusted in order to get the best out of each data set. High-resolution gridded data for upper and lower ice surface topography and cavity geometry of the Amery, Fimbul, Filchner-Ronne, Larsen C and George VI Ice Shelves, and for Pine Island Glacier have been carefully merged into the ambient ice and ocean topographies. [...]）