Initial borehole results from the Amery Ice Shelf hot-water drilling project
Initial borehole results from the Amery Ice Shelf hot-water drilling project
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DOI：
10.3189/172756404781814311
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发表时间：
2004-06
影响因子：
2.9
通讯作者：
M. Craven;I. Allison;Russell Brand;A. Elcheikh;J. Hunter;M. Hemer;S. Donoghue
中科院分区：
文献类型：
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作者：
M. Craven;I. Allison;Russell Brand;A. Elcheikh;J. Hunter;M. Hemer;S. Donoghue
阿莫里冰架海洋研究项目(阿米科尔)的目标是研究和量化冰架、冰层内部和冰架下循环的海洋水团之间相互作用的过程。两个钻孔融化通过陆架，在冰解锋面100公里范围内，进入海洋洞穴。其中一个(AM02)位于被认为正在发生基底融化的地点，另一个(AM01)位于海冰堆积的区域。在这两个地点，夏季的海洋结构显示出冰架下直接厚达100米的融水修改的边界层。AM02上空腔的盐度和温度数据显示出强烈的季节循环，这是冰架底部融化和普里兹湾海冰过程修改的海洋水团入侵的共同结果。在AM01，一层200米厚的海洋冰层覆盖着大气冰，随着深度的增加，盐度增加，稳定同位素分馏减少。最低100米的海冰具有高渗透性，具有长方形带状结构相。这项研究的其他初步结果也被报道了。
Abstract The Amery Ice Shelf Ocean Research (AMISOR) project aims to examine and quantify processes involved in the interaction between the ice shelf, the interior grounded ice and the oceanic water masses that circulate beneath it. Two boreholes were melted through the shelf, within 100 km of the calving front, to access the ocean cavity. One (AM02) was at a site where it was believed that basal melt was occurring, and the other (AM01) was in a region with accreted marine ice. At both sites the summertime ocean structure revealed meltwater-modified boundary layers up to 100 m thick immediately beneath the shelf. Salinity and temperature data in the upper cavity at AM02 showed a strong seasonal cycle as a result of a combination of ice-shelf basal melt, and the intrusion of ocean water masses modified by sea-ice processes in Prydz Bay. At AM01, a 200m thick layer of marine ice underlay the meteoric ice, and showed an increase in salinity and decrease in stable-isotope fractionation with depth. The lowest 100m of marine ice was highly permeable, with a rectangular banded textural facies. Other preliminary results from this study are also reported.