Modelling the evolution of the Antarctic ice sheet since the last interglacial
Modelling the evolution of the Antarctic ice sheet since the last interglacial
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模拟自上次间冰期以来南极冰盖的演变
DOI：
10.5194/tc-8-1347-2014
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
J. Oerlemans
中科院分区：
文献类型：
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作者：
M. Maris;B. Boer;S. Ligtenberg;M. Crucifix;W. J. Berg;J. Oerlemans
本文研究了末次间冰期至今，两个滑动参数（一个变形速度参数和两个基岩偏转参数）的变化对南极冰盖演化的影响。这些灵敏度实验是通过实时正演动态冰模型ANICE进行的。时间气候强迫是通过在区域气候模式产生的两个时间气候状态之间进行插值来建立的。插值是这样做的，温度和表面质量平衡都遵循欧洲南极冰芯项目（EPICA）圆顶C冰芯温度代理记录。我们确定了一组最优参数值，可以模拟真实的接地线退缩历史和现在的冰盖；将具有这组参数值的仿真定义为参考仿真。相对于这一参考模拟，滑动的增加导致南极冰体积的减少，这主要是由于南极西部冰盖上冰速度的增加。变形速度参数变化的影响主要表现为南极东部冰量的变化。此外，与观测结果一致，我们发现南极冰体积在全新世中期出现了最小值。在我们的模型结果中，这是一个鲁棒特征，其中最小值的强度和时间都取决于所研究的参数。更多的滑动和更慢的反应基岩导致更强的最小值，在更早的时间出现。根据模式结果，我们得出结论，从末次冰盛期（南极冰盖约为16 ka）到现在，南极冰盖为全球海洋贡献了10.7±1.3 m的海平面上升。
We present the effects of changing two sliding parameters, a deformational velocity parameter and two bedrock deflection parameters on the evolution of the Antarctic ice sheet over the period from the last interglacial until the present. These sensitivity experiments have been conducted by running the dynamic ice model ANICE forward in time. The temporal climatological forcing is established by interpolating between two temporal climate states created with a regional climate model. The interpolation is done in such a way that both temperature and surface mass balance follow the European Project for Ice Coring in Antarctica (EPICA) Dome C ice-core proxy record for temperature. We have determined an optimal set of parameter values, for which a realistic grounding-line retreat history and present-day ice sheet can be simulated; the simulation with this set of parameter values is defined as the reference simulation. An increase of sliding with respect to this reference simulation leads to a decrease of the Antarctic ice volume due to enhanced ice velocities on mainly the West Antarctic ice sheet. The effect of changing the deformational velocity parameter mainly yields a change in east Antarctic ice volume. Furthermore, we have found a minimum in the Antarctic ice volume during the mid-Holocene, in accordance with observations. This is a robust feature in our model results, where the strength and the timing of this minimum are both dependent on the investigated parameters. More sliding and a slower responding bedrock lead to a stronger minimum which emerges at an earlier time. From the model results, we conclude that the Antarctic ice sheet has contributed 10.7 ± 1.3 m of eustatic sea level to the global ocean from the last glacial maximum (about 16 ka for the Antarctic ice sheet) until the present.
影响因子：
56.9
作者：
M. Weber;P. Clark;W. Ricken;J. Mitrovica;S. Hostetler;G. Kuhn
通讯作者：
M. Weber;P. Clark;W. Ricken;J. Mitrovica;S. Hostetler;G. Kuhn