Variations of the Antarctic Ice Sheet in a Coupled Ice Sheet‐Earth‐Sea Level Model: Sensitivity to Viscoelastic Earth Properties
Variations of the Antarctic Ice Sheet in a Coupled Ice Sheet‐Earth‐Sea Level Model: Sensitivity to Viscoelastic Earth Properties
复制标题
冰盖-地球-海平面耦合模型中南极冰盖的变化：对地球粘弹性特性的敏感性
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
R. DeConto
中科院分区：
文献类型：
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作者：
D. Pollard;N. Gomez;R. DeConto
一个耦合的冰盖-固体地球-海平面模型被应用于南极冰盖的长期变化。全球地球模型中的一组径向变化的粘弹性剖面被用来探索冰盖变化的反馈，包括一个非常弱的上地幔带和薄岩石圈代表西南极地区。模拟了（1）过去约20，000年的冰川消退，（2）未来5，000年的温室气体情景代表性浓度路径8.5（RCP8.5），以及（3）温暖的上新世约3 Ma。对于冰消期的625个模拟的大合奏进行了分析，与地质和现代数据的比较为基础，计算每个运行的分数。对于五个地球剖面中的每一个，集合中其他模型参数的最高得分组合用于执行未来和上新世的模拟。对于最后一次冰退，粘弹性地球剖面产生相对较小的差异，总的冰量和等效海平面。而上地幔较弱、岩石圈较薄的剖面，未来冰退和上新统运行的负反馈作用较强，冰退较少。这是由于在这些运行中冰盖退缩的速度更快，导致卸载后粘性基岩反弹的滞后更大，这使得粘性剖面的影响更大。然而，接地线后退的差异主要位于东南极盆地，那里的上地幔较弱，岩石圈较薄，这可能是不现实的，强调了地球模型中横向不均匀性的必要性。
A coupled ice sheet‐solid Earth‐sea level model is applied to long‐term variations of the Antarctic ice sheet. A set of radially varying viscoelastic profiles in the global Earth model is used to explore feedbacks on ice sheet variability, including one with a very weak upper mantle zone and thin lithosphere representative of West Antarctic regions. Simulations are performed for (1) the deglacial retreat over the last ~20,000 years, (2) the future 5,000 years with greenhouse‐gas scenario Representative Concentration Pathway 8.5 (RCP8.5), and (3) the warm Pliocene ~3 Ma. For the deglacial period a large ensemble of 625 simulations is analyzed, with a score computed for each run based on comparisons to geologic and modern data. For each of the five Earth profiles, the top‐scoring combinations of the other model parameters in the ensemble are used to perform future and Pliocene simulations. For the last deglacial retreat, the viscoelastic Earth profiles produce relatively small differences in overall ice volume and equivalent sea level. In contrast, profiles with weak upper mantle and thin lithosphere produce strong negative feedback and less ice retreat in the future and Pliocene runs. This is due to the faster pace of ice sheet retreat in these runs, leading to greater lags in the viscous bedrock rebound behind the unloading, which allows for greater influence of the viscosity profiles. However, the differences in grounding‐line retreat are located primarily in East Antarctic basins, where a weak upper mantle and thin lithosphere may not be realistic, emphasizing the need for lateral heterogeneity in the Earth model.
影响因子：
18.3
作者：
P. Stocchi;C. Escutia;A. Houben;B. Vermeersen;P. Bijl;H. Brinkhuis;R. DeConto;S. Galeotti;S. Passchier;D. Pollard;A. Klaus;Annick Fehr;T. Williams;J. Bendle;S. Bohaty;S. Carr;R. Dunbar;J. Flores;J. Gonzàlez;T. Hayden;M. Iwai;F. Jiménez-Espejo;K. Katsuki;G. Kong;R. McKay;M. Nakai;M. Olney;S. Pekar;J. Pross;C. Riesselman;U. Röhl;T. Sakai;P. Shrivastava;C. Stickley;S. Sugisaki;L. Tauxe;S. Tuo;T. Flierdt;K. Welsh;M. Yamane
通讯作者：
P. Stocchi;C. Escutia;A. Houben;B. Vermeersen;P. Bijl;H. Brinkhuis;R. DeConto;S. Galeotti;S. Passchier;D. Pollard;A. Klaus;Annick Fehr;T. Williams;J. Bendle;S. Bohaty;S. Carr;R. Dunbar;J. Flores;J. Gonzàlez;T. Hayden;M. Iwai;F. Jiménez-Espejo;K. Katsuki;G. Kong;R. McKay;M. Nakai;M. Olney;S. Pekar;J. Pross;C. Riesselman;U. Röhl;T. Sakai;P. Shrivastava;C. Stickley;S. Sugisaki;L. Tauxe;S. Tuo;T. Flierdt;K. Welsh;M. Yamane
影响因子：
64.8
作者：
Golledge, N. R.;Kowalewski, D. E.;Gasson, E. G. W.
通讯作者：
Gasson, E. G. W.