Glacial and Subglacial Topography of West Antarctica
Glacial and Subglacial Topography of West Antarctica
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DOI：
10.3189/s0022143000027271
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发表时间：
1961-03
影响因子：
3.4
通讯作者：
C. Bentley;N. Ostenso
中科院分区：
文献类型：
--
作者：
C. Bentley;N. Ostenso
本文总结了1957年1月至1959年1月在玛丽伯德地和埃尔斯沃思高地进行的三次积雪穿越所采用的技术和取得的结果。在30海里（55.5公里）处进行地震反射拍摄。将这些间隔与重力、磁力和高度测量相结合，以确定冰川和冰下地形。人们发现，南极洲西部的大部分地区都有一个远低于海平面的冰岩界面。最大深度超过2，500米的主要连接通道。罗斯海和贝灵斯豪森-阿蒙森海之间存在着低于海平面的海洋，而罗斯海和威德尔海之间没有主要的地形联系。这条海峡将西南极洲分为两个地区，东部和南部为花岗岩和沉积岩，西北部为火山区。目前的冰流从两个高地向外，集中在海峡两侧的山区。得出的结论是，目前的冰盖是从两个较小的冰盖，形成在山区和加入跨越中间的开放水域的会聚。
Abstract A summary of the techniques used and results obtained from three oversnow traverses in Marie Byrd Land and the Ellsworth Highland between January 1957 and January 1959 is presented. Seismic reflection shooting at 30 nautical mile (55.5 km.) intervals was combined with gravity, magnetic and altimetric measurements to determine the glacial and subglacial topography. It was found that a vast portion of West Antarctica has an ice–rock interface well below sea-level. A major connecting channel with a maximum depth of more than 2,500 m. below sea-level exists between the Ross and Bellingshausen–Amundsen Seas, whereas there is no major topographic connection between the Ross and Weddell Seas. This channel divides West Antarctica into two provinces with granite and rocks of sedimentary origin to the east and south, and a volcanic region to the north-west. Present ice flow is outward from two high areas, centred over mountainous regions on either side of the channel. It is concluded that the present ice sheet has grown from the convergence of the two smaller ice sheets which formed in the mountainous areas and joined across the intervening open water.