Bed topography of Princess Elizabeth Land in East Antarctica
Bed topography of Princess Elizabeth Land in East Antarctica
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DOI：
10.5194/essd-2020-126
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发表时间：
2020-07
影响因子：
11.4
通讯作者：
X. Cui;H. Jeofry;J. Greenbaum;Jingxue Guo;Lin Li;L. Lindzey;F. Habbal;Wei Wei-Wei;D. Young;N. Ross;M. Morlighem;Lenneke M. Jong;J. Roberts;D. Blankenship;S. Bo;M. Siegert
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文献类型：
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作者：
X. Cui;H. Jeofry;J. Greenbaum;Jingxue Guo;Lin Li;L. Lindzey;F. Habbal;Wei Wei-Wei;D. Young;N. Ross;M. Morlighem;Lenneke M. Jong;J. Roberts;D. Blankenship;S. Bo;M. Siegert
抽象的。我们提出了东南极洲伊丽莎白公主地 (PEL) 的地形数字高程模型 (DEM)。 DEM 覆盖面积约为 900 000 平方公里，是根据自 2015 年以来的四次活动中收集的无线电回波探测数据构建的。以前，为了生成 Bedmap2 地形产品，PEL 的地床是根据一个大范围（>200 公里宽）无数据区域的低分辨率卫星重力数据来表征的。我们使用质量守恒 (MC) 方法在冰盖的快速流动 (>30 m yr−1) 区域生成冰厚度网格，并在流动较慢的区域形成流线扩散。将生成的冰厚度模型与冰面模型集成以构建冰床 DEM。这个新床 DEM 与 BedMachine Antarctica 和 Bedmap2 一起完成了南极洲冰下大陆的一阶测量——这是一项大约 70 年前开始的国际任务。 PEL 的冰厚数据和海床 DEM（相对于从南极洲参考高程模型 – REMA 获得的冰面高程在 500 m 处水平解析）可从 https://doi.org/10.5281/zenodo.4023343 获取（Cui 等人，2020a）和 https://doi.org/10.5281/zenodo.4023393（Cui 等人，2020b）。
Abstract. We present a topographic digital elevation model (DEM) for Princess Elizabeth Land (PEL), East Antarctica. The DEM covers an area of ∼900 000 km2 and was built from radio-echo sounding data collected during four campaigns since 2015. Previously, to generate the Bedmap2 topographic product, PEL's bed was characterized from low-resolution satellite gravity data across an otherwise large (>200 km wide) data-free zone. We use the mass conservation (MC) method to produce an ice thickness grid across faster flowing (>30 m yr−1) regions of the ice sheet and streamline diffusion in slower flowing areas. The resulting ice thickness model is integrated with an ice surface model to build the bed DEM. Together with BedMachine Antarctica and Bedmap2, this new bed DEM completes the first-order measurement of subglacial continental Antarctica – an international mission that began around 70 years ago. The ice thickness data and bed DEMs of PEL (resolved horizontally at 500 m relative to ice surface elevations obtained from the Reference Elevation Model of Antarctica – REMA) are accessible from https://doi.org/10.5281/zenodo.4023343 (Cui et al., 2020a) and https://doi.org/10.5281/zenodo.4023393 (Cui et al., 2020b).