Representing grounding line migration in synchronous coupling between a marine ice sheet model and a z-coordinate ocean model

Representing grounding line migration in synchronous coupling between a marine ice sheet model and a z-coordinate ocean model
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表示海洋冰盖模型与 z 坐标海洋模型同步耦合中的接地线偏移

DOI:
10.1016/j.ocemod.2018.03.005
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发表时间:
2018
期刊:
影响因子:
3.2
通讯作者:
Goldberg D
Goldberg D
中科院分区:
地球科学3区
文献类型:
--
作者:
Goldberg D

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建立了冰盖模式与z坐标海洋模式(MITgcm)的同步耦合。先前开发的允许浮冰架的冰-海洋界面的连续垂直运动(“垂直耦合”)的方案被建立在允许接地线或冰盖的漂浮点的连续运动(“水平耦合”)的基础上。水平耦合是通过在冰下维持一层薄薄的海洋(0.1 m)来实现的,当冰脱离地面时,这层海洋会膨胀到真实的海洋中。这是通过修改海洋模型的非线性自由表面演变的方式类似于水文模型中存在的陡峭的测深。耦合模型被应用到一些理想化的几何形状,并成功地代表海洋强迫海洋冰盖撤退,同时保持连续的海洋环流。
Synchronous coupling is developed between an ice sheet model and az-coordinate ocean model (the MITgcm). A previously-developed scheme to allow continuous vertical movement of the ice-ocean interface of a floating ice shelf (“vertical coupling”) is built upon to allow continuous movement of the grounding line, or point of floatation of the ice sheet (“horizontal coupling”). Horizontal coupling is implemented through the maintenance of a thin layer of ocean ( ∼ 1 m) under grounded ice, which is inflated into the real ocean as the ice ungrounds. This is accomplished through a modification of the ocean model’s nonlinear free surface evolution in a manner akin to a hydrological model in the presence of steep bathymetry. The coupled model is applied to a number of idealized geometries and shown to successfully represent ocean-forced marine ice sheet retreat while maintaining a continuous ocean circulation.
使用二维动态有限元模型模拟河流漫滩上的悬浮沉积物沉积
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