Holocene stability of the Amundsen-Weddell ice divide, West Antarctica

Holocene stability of the Amundsen-Weddell ice divide, West Antarctica
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南极洲西部阿蒙森-威德尔冰分水岭的全新世稳定性

DOI:
10.1130/g31920.1
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发表时间:
2011
期刊:
影响因子:
5.8
通讯作者:
Ross N
Ross N
中科院分区:
地球科学1区
文献类型:
--
作者:
Ross N

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我们使用全球定位系统和在阿蒙森-韦德尔冰川分水岭附近获得的无线电回波探测数据分析了全新世冰流,该分水岭位于松岛冰川和西南极研究所冰流之间。资料表明,西南极冰盖的这一部分在∼7000年以来一直保持着稳定的冰流状况和冰裂位置。支持这一说法的独立冰川地质数据表明,自上一次冰盛期(LGM)以来,埃尔斯沃斯山脉以西的WAIS内部仅变薄了几百米,冰川分水岭的位置可能会在更长的(超过20K.Y.,也许是第四纪之前)的时间尺度上反复出现。我们认为,基本地形限制了WAIS这一部分的冰流,使冰分裂与其他冰分割相比,对冰盖边缘的扰动相对不敏感。作为冰盖表面和流线模式的主要重组,在WAIS的其他地方测量到的大范围强迫可能只表现在阿蒙森-韦德尔内部的简单垂直变化中。
We analyze Holocene ice flow using global positioning system and radio-echo sounding data acquired near the Amundsen-Weddell ice divide, between Pine Island Glacier and the Institute Ice Stream, West Antarctica. The data show that this part of the West Antarctic Ice Sheet (WAIS) has maintained a stable ice flow regime and ice divide position for ∼7000 yr. Independent glacial geological data, in support of this assertion, suggest that the interior of the WAIS west of the Ellsworth Mountains has thinned by only a few hundred meters since the Last Glacial Maximum (LGM) and that the position of the ice divide may be recurrent over longer (more than 20 k.y., perhaps pre-Quaternary) time scales. We suggest that basal topography constrains ice flow in this sector of the WAIS, making the ice divide relatively insensitive to perturbations around the margins of the ice sheet compared with other ice divides. Large-scale forcing measured elsewhere in the WAIS as major reorganizations of the ice sheet surface and flowline pattern may be manifested only in simple vertical changes of the Amundsen-Weddell interior.
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