Antarctic basal environment shaped by high-pressure flow through a subglacial river system
Antarctic basal environment shaped by high-pressure flow through a subglacial river system
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冰下河流系统高压流塑造的南极基底环境
DOI：
10.1038/s41561-022-01059-1
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发表时间：
2022
影响因子：
18.3
通讯作者：
Dow C
中科院分区：
文献类型：
--
作者：
Dow C
冰盖的稳定性及其对海平面的贡献是由高压水调节的，高压水润滑着冰层的底部，促进冰层快速流入海洋。在南极洲，冰下过程的特征很差，限制了对冰盖流动及其对气候强迫敏感性的认识。在这里，利用数值模拟和地球物理数据，我们提供了广泛的证据，长达460公里，树状组织的冰下水文系统，从冰盖内部延伸到地面边缘。我们发现，这些通道在高压下输送大量淡水（~24 m3s−1），可能会促进上方冰流的增强。水在特定的位置离开冰盖，似乎推动了这些对冰盖稳定至关重要的地区的冰架融化。冰下河道大小的变化可以影响主要河道两侧100公里范围内周围排水系统的水深和压力。我们的研究结果表明，在计算冰盖流量和评估接地带冰架融化时，纳入流域尺度基础水文的重要性。因此，要了解南极洲边缘地区如何运作以及未来可能发生的变化，就需要了解在冰盖内部起作用并源于冰盖内部的过程。
The stability of ice sheets and their contributions to sea level are modulated by high-pressure water that lubricates the base of the ice, facilitating rapid flow into the ocean. In Antarctica, subglacial processes are poorly characterized, limiting understanding of ice-sheet flow and its sensitivity to climate forcing. Here, using numerical modelling and geophysical data, we provide evidence of extensive, up to 460 km long, dendritically organized subglacial hydrological systems that stretch from the ice-sheet interior to the grounded margin. We show that these channels transport large fluxes (~24 m3s−1) of freshwater at high pressure, potentially facilitating enhanced ice flow above. The water exits the ice sheet at specific locations, appearing to drive ice-shelf melting in these areas critical for ice-sheet stability. Changes in subglacial channel size can affect the water depth and pressure of the surrounding drainage system up to 100 km either side of the primary channel. Our results demonstrate the importance of incorporating catchment-scale basal hydrology in calculations of ice-sheet flow and in assessments of ice-shelf melt at grounding zones. Thus, understanding how marginal regions of Antarctica operate, and may change in the future, requires knowledge of processes acting within, and initiating from, the ice-sheet interior.
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伊斯布拉和冰流
影响因子：
2.9
作者：
M. Truffer;K. Echelmeyer
通讯作者：
K. Echelmeyer
恢复冰流中活动冰下湖泊的动力学
DOI：
10.1002/2017jf004409
发表时间：
2018
期刊：
Journal of Geophysical Research: Earth Surface
影响因子：
--
作者：
Silje Smith;Basile de Fleurian;N. Schlegel;H. Seroussi;K. Nisancioglu
通讯作者：
K. Nisancioglu
影响因子：
18.3
作者：
Adusumilli S;Fricker HA;Medley B;Padman L;Siegfried MR
通讯作者：
Siegfried MR
影响因子：
11.4
作者：
H. Jeofry;N. Ross;H. Corr;Jilu Li;M. Morlighem;P. Gogineni;M. Siegert
通讯作者：
H. Jeofry;N. Ross;H. Corr;Jilu Li;M. Morlighem;P. Gogineni;M. Siegert
影响因子：
13.6
作者：
Dow CF;Lee WS;Greenbaum JS;Greene CA;Blankenship DD;Poinar K;Forrest AL;Young DA;Zappa CJ
通讯作者：
Zappa CJ