Is the west Antarctic Ice Sheet disintegrating
Is the west Antarctic Ice Sheet disintegrating
复制标题
南极西部冰盖正在崩解吗
DOI：
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发表时间：
1973
期刊：
影响因子：
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通讯作者：
T. Hughes
中科院分区：
文献类型：
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作者：
T. Hughes
有关的动力学和历史的西南极冰盖的数据进行审查和解释的冰盖可能固有的不稳定性。对有关南极洲西部过去和现在冰盖的已发表数据的研究表明，在过去几百万年里，冰盖一直在分阶段退缩，每个退缩阶段之前都有一个相当持续时间的前进。因此，西南极冰盖的解体似乎遵循其他大陆冰盖的解体模式，可能是全球晚新生代冰期的最后阶段。至少有一些撤退阶段似乎已经快到足以被称为激增。前进阶段似乎暂时引入了平衡条件，因为平衡冰盖表面轮廓可以从冰碛等重建，从而标记每次前进的稳定极限。从玛丽伯德地进入伦讷冰架和罗斯冰架的沿沿着流线的冰盖表面剖面不是平衡剖面，表明西南极冰盖是不稳定的。对南极西部冰盖的接地部分的分析表明，与表面轮廓、冰速度和质量平衡有关的数据都与平衡冰盖不相容。不稳定性似乎集中在排出玛丽伯德地的主要冰流中。对西南极冰盖漂浮部分的分析表明，罗斯冰架的西普尔海岸沿着的基底融化最为明显，并导致接地线后退到玛丽伯德地。不稳定性似乎与接地线的突然后退有关。
Data pertaining to the dynamics and history of the west antarctic ice cover are reviewed and interpreted in terms of a possible inherent instability of the ice cover. A study of published data concerning the past and present ice cover of West Antarctica indicates that during the last few million years the ice sheet has been retreating in stages, each retreat stage being preceded by an advance of comparable duration. Thus disintegration of the west antarctic ice sheet seems to follow the disintegration pattern of other continental ice sheets and may be the last phase of the worldwide Late Cenozoic ice age. At least some of the retreat stages seem to have been rapid enough to be called surges. Stages of advance seem to have temporarily introduced equilibrium conditions, since equilibrium ice sheet surface profiles can be reconstructed from the moraines, etc., and thus mark the stable limits of each advance. Present ice sheet surface profiles along flowlines entering both the Ronne and the Ross ice shelves from Marie Byrd Land are not equilibrium profiles, suggesting that the west antarctic ice sheet is unstable. An analysis of the grounded portion of the west antarctic ice cover indicates that data relating to the surface profile, ice velocity, and the mass balance are all incompatible with an equilibrium ice sheet. Instability seems to be centered in the major ice streams that drain Marie Byrd Land. An analysis of the floating portion of the west antarctic ice cover indicates that basal melting is most pronounced along the Siple Coast of the Ross ice shelf and causes retreat of the grounding line into Marie Byrd Land. Instability seems to be related to sudden retreats of the grounding line.