Coupling of ice-shelf melting and buttressing is a key process in ice-sheets dynamics
Coupling of ice-shelf melting and buttressing is a key process in ice-sheets dynamics
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DOI：
10.1029/2010gl043334
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发表时间：
2010-07-24
影响因子：
5.2
通讯作者：
Le Meur, E.
中科院分区：
文献类型：
--
作者：
Gagliardini, O.;Durand, G.;Le Meur, E.
一般认为，冰架融化的增加引发了最近的沿海冰盖变薄。使用一个完整的斯托克斯有限元模型，其中包括一个适当的描述接地线动态，我们调查冰架下融化的影响。我们认为，冰架融化对冰盖动力学的影响引起了复杂的反应，第一个天真的观点，融化不可避免地导致地面冰的损失是错误的。我们表明，融化直接作用于支撑力的大小，通过修改经历横向阻力和冰架速度的区域，这表明冰架施加的背应力的减少是内陆动力减薄的主要原因。我们进一步表明，融化和支撑力的反馈可以导致非平凡的结果，平均融化速率的增加可能会导致内陆冰增厚和接地线前进。引文：Gagliardini，O.，G. Durand，T.茨温格河C. A. Hindmarsh和E. Le Meur（2010年），冰架融化和支撑作用的耦合是冰盖动力学的关键过程，Geophys。保留信函：37，L14501，doi：10.1029/2010GL043334。
Increase in ice-shelf melting is generally presumed to have triggered recent coastal ice-sheet thinning. Using a full-Stokes finite element model which includes a proper description of the grounding line dynamics, we investigate the impact of melting below ice shelves. We argue that the influence of ice-shelf melting on the ice-sheet dynamics induces a complex response, and the first naive view that melting inevitably leads to loss of grounded ice is erroneous. We demonstrate that melting acts directly on the magnitude of the buttressing force by modifying both the area experiencing lateral resistance and the ice-shelf velocity, indicating that the decrease of back stress imposed by the ice-shelf is the prevailing cause of inland dynamical thinning. We further show that feedback from melting and buttressing forces can lead to nontrivial results, as an increase in the average melt rate may lead to inland ice thickening and grounding line advance. Citation: Gagliardini, O., G. Durand, T. Zwinger, R. C. A. Hindmarsh, and E. Le Meur (2010), Coupling of ice-shelf melting and buttressing is a key process in ice-sheets dynamics, Geophys. Res. Lett., 37, L14501, doi:10.1029/2010GL043334.