A high-resolution synthetic bed elevation grid of the Antarctic continent
A high-resolution synthetic bed elevation grid of the Antarctic continent
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DOI：
10.5194/essd-9-267-2017
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发表时间：
2016-07
影响因子：
11.4
通讯作者：
Felicity S. Graham;Jason L. Roberts;B. Galton-Fenzi;Duncan Young;Donald D. Blankenship;M. J. Siegert-M.-J.-Sieger
中科院分区：
文献类型：
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作者：
Felicity S. Graham;Jason L. Roberts;B. Galton-Fenzi;Duncan Young;Donald D. Blankenship;M. J. Siegert-M.-J.-Sieger
抽象的。南极海床地形的数字高程模型被平滑并内插到低分辨率(>；1公里)网格上，因为当前观测的地形数据通常是稀疏和不均匀采样的。这个问题对冰盖动力学的数值模拟有潜在的影响，特别是在容易不稳定的地区，那里需要详细的地形知识，包括精细的粗糙度。在这里，我们介绍了一个高分辨率(100米)的南极洲合成海床高程地形，包括大陆、大陆架和南纬60°S以南的海洋，尽管合成海床表面-表示为HRES-保留了ICECAP(调查南极中部板块冰圈演化)联盟测量的或用于创建Bedmap1汇编的空中和地面冰层穿透雷达数据的地形粗糙度特征。使用Bedmap2海床高程数据的低通滤波结合了南极地貌的大尺度(5公里分辨率)特征。HRES在高分辨率冰盖模拟研究中具有适用性，包括对地形、冰盖动力学和水文学之间相互作用的调查，在这些研究中，过程对海床高度和细尺度粗糙度高度敏感。这些数据可从澳大利亚南极数据中心下载(DOI：10.4225/15/57464ADE22F50)。
Abstract. Digital elevation models of Antarctic bed topography are smoothed and interpolated onto low-resolution ( > 1 km) grids as current observed topography data are generally sparsely and unevenly sampled. This issue has potential implications for numerical simulations of ice-sheet dynamics, especially in regions prone to instability where detailed knowledge of the topography, including fine-scale roughness, is required. Here, we present a high-resolution (100 m) synthetic bed elevation terrain for Antarctica, encompassing the continent, continental shelf, and seas south of 60° S. Although not identically matching observations, the synthetic bed surface – denoted as HRES – preserves topographic roughness characteristics of airborne and ground-based ice-penetrating radar data measured by the ICECAP (Investigating the Cryospheric Evolution of the Central Antarctic Plate) consortium or used to create the Bedmap1 compilation. Broad-scale ( > 5 km resolution) features of the Antarctic landscape are incorporated using a low-pass filter of the Bedmap2 bed elevation data. HRES has applicability in high-resolution ice-sheet modelling studies, including investigations of the interaction between topography, ice-sheet dynamics, and hydrology, where processes are highly sensitive to bed elevations and fine-scale roughness. The data are available for download from the Australian Antarctic Data Centre ( doi:10.4225/15/57464ADE22F50 ).