Controls on Last Glacial Maximum ice extent in the Weddell Sea embayment, Antarctica
Controls on Last Glacial Maximum ice extent in the Weddell Sea embayment, Antarctica
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对南极洲威德尔海海湾末次冰期最大冰范围的控制
DOI：
10.1002/2016jf004121
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Whitehouse P
中科院分区：
文献类型：
--
作者：
Whitehouse P
南极冰盖的威德尔海部分被假设为自末次冰盛期以来对海平面上升做出了重大贡献。使用数值流线模型，我们调查的控制接地线运动在威德尔海东部，并比较我们的结果与现场数据有关过去的冰的范围。具体来说，我们调查的影响，在冰温度，积累，海平面，冰架底部融化，冰架扶壁的基础冰流的动态变化。我们发现，冰架底部融化起着重要的作用，在控制接地线前进，而减少冰架扶壁被发现是必要的接地线撤退。在冰川条件下，接地线有两个稳定的位置：在伯克纳岛的北方边缘和大陆架断裂处。与这两种情景相关的全球平均海平面贡献分别为~50 mm和~130 mm。将模型结果与来自彭萨科拉山脉和沙克尔顿山脉的实地证据进行比较，我们发现在末次冰期循环期间，冰不太可能在大陆架断裂处长时间接地。然而，我们不能排除短暂的前进到这个位置，或者在冰消期间接地线后退到现在之后，然后重新前进的情况。需要对过去的冰盖和冰架几何形状、海洋温度和海洋环流进行更好的约束，以更有力地重建基金会冰流过去的行为。
The Weddell Sea sector of the Antarctic Ice Sheet is hypothesized to have made a significant contribution to sea‐level rise since the Last Glacial Maximum. Using a numerical flowline model we investigate the controls on grounding line motion across the eastern Weddell Sea and compare our results with field data relating to past ice extent. Specifically, we investigate the influence of changes in ice temperature, accumulation, sea level, ice shelf basal melt, and ice shelf buttressing on the dynamics of the Foundation Ice Stream. We find that ice shelf basal melt plays an important role in controlling grounding line advance, while a reduction in ice shelf buttressing is found to be necessary for grounding line retreat. There are two stable positions for the grounding line under glacial conditions: at the northern margin of Berkner Island and at the continental shelf break. Global mean sea‐level contributions associated with these two scenarios are ~50 mm and ~130 mm, respectively. Comparing model results with field evidence from the Pensacola Mountains and the Shackleton Range, we find it unlikely that ice was grounded at the continental shelf break for a prolonged period during the last glacial cycle. However, we cannot rule out a brief advance to this position or a scenario in which the grounding line retreated behind present during deglaciation and has since re‐advanced. Better constraints on past ice sheet and ice shelf geometry, ocean temperature, and ocean circulation are needed to reconstruct more robustly past behavior of the Foundation Ice Stream.
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影响因子：
18.3
作者：
Rignot, Eric;Bamber, Jonathan L.;Van Meijgaard, Erik
通讯作者：
Van Meijgaard, Erik
南极洲西部威德尔海区接地线的陡峭反向床坡
影响因子：
18.3
作者：
Ross N
通讯作者：
Ross N
南极洲基础冰流附近彭萨科拉山脉的宇宙成因核素暴露年龄
影响因子：
2.9
作者：
Balco, G.;Todd, C.;Huybers, K.;Campbell, S.;Vermeulen, M.;Hegland, M.;Goehring, B. M.;Hillebrand, T. R.
通讯作者：
Hillebrand, T. R.
DOI：
10.5194/tc-8-1347-2014
发表时间：
2014
期刊：
The Cryosphere
影响因子：
--
作者：
M. Maris;B. Boer;S. Ligtenberg;M. Crucifix;W. J. Berg;J. Oerlemans
通讯作者：
J. Oerlemans
影响因子：
2.9
作者：
Van Der Veen;WHILLANst
通讯作者：
WHILLANst