BEDMAP: a new ice thickness and subglacial topographic model of Antarctica
BEDMAP: a new ice thickness and subglacial topographic model of Antarctica
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DOI：
10.1029/2000jb900449
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发表时间：
2001-06
影响因子：
--
通讯作者：
M. Lythe;D. Vaughan
中科院分区：
文献类型：
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作者：
M. Lythe;D. Vaughan
在过去50年进行的调查中收集的南极冰盖冰厚测量数据已汇集到一个单一的数据库中。根据这些数据，为南极洲及其周围海洋编制了一套无缝的数字地形模型。这包括接地冰盖和冰架上方的冰盖厚度网格、浮动冰架下方的水柱厚度、接地冰盖下方的河床高程以及60°S的水深测量，包括冰架下的洞穴。这些网格与南极洲最近的高分辨率地表高程模型相一致。虽然数字模型的标称空间分辨率为5公里，但仅在冰盖的几个部分上的原始数据密度证明了如此高的分辨率是合理的。然而，该套件确实提供了冰盖下的地圈的无与伦比的视野，并为冰盖建模提供了比早期地图更可靠的基础。根据BEDMAP网格计算出的南极冰盖总体积为2 540万立方公里，根据接地冰盖内的冰量得出的总海平面当量为57米，其中东南极冰盖为52米，西南极冰盖为5米，略低于早先的估计。网格化数据集可从作者处获得。
Measurements of ice thickness on the Antarctic ice sheet collected during surveys undertaken over the past 50 years have been brought together into a single database. From these data, a seamless suite of digital topographic models have been compiled for Antarctica and its surrounding ocean. This includes grids of ice sheet thickness over the grounded ice sheet and ice shelves, water column thickness beneath the floating ice shelves, bed elevation beneath the grounded ice sheet, and bathymetry to 60°S, including the sub-ice-shelf cavities. These grids are consistent with a recent high-resolution surface elevation model of Antarctica. While the digital models have a nominal spatial resolution of 5 km, such high resolution is justified by the original data density only over a few parts of the ice sheet. The suite does, however, provide an unparalleled vision of the geosphere beneath the ice sheet and a more reliable basis for ice sheet modeling than earlier maps. The total volume of the Antarctic ice sheet calculated from the BEDMAP grid is 25.4 million km3, and the total sea level equivalent, derived from the amount of ice contained within the grounded ice sheet, is 57 m, comprising 52 m from the East Antarctic ice sheet and 5 m from the West Antarctic ice sheet, slightly less than earlier estimates. The gridded data sets can be obtained from the authors.