Stress and deformation characteristics of sea ice in a high-resolution, anisotropic sea ice model.
Stress and deformation characteristics of sea ice in a high-resolution, anisotropic sea ice model.
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DOI：
10.1098/rsta.2017.0349
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发表时间：
2018-09-28
期刊：
影响因子：
--
通讯作者：
Tsamados M
中科院分区：
文献类型：
--
作者：
Heorton HDBS;Feltham DL;Tsamados M
漂浮在极地海洋上的海冰的漂移和变形是由外加风和洋流引起的。在海洋盆地的长度尺度上，海冰的内部应力和边界条件导致可观察到的变形模式。在卫星图像中以及在浮冰跟踪产生的速度场中可以观察到裂缝和引线。在气候海冰模式中，海冰在海洋盆地长度尺度上的变形是使用流变学来模拟的，该流变学表示海冰覆盖层内的应力和变形之间的关系。在这里，我们调查之间的联系紧急变形特性和潜在的内部海冰应力使用洛斯阿拉莫斯数值海冰气候模式。我们已经开发了一个理想化的正方形域，专注于海冰流变学在空间分辨率高达500米的变形中的作用。我们使用的弹性各向异性塑料（EAP）和弹性粘塑性（EVP）流变学，比较它们的稳定性，与EAP流变学产生更尖锐的变形功能比EVP在所有的空间和时间分辨率。该区域内的海冰受到理想化风的影响，出现了五种不同的变形类型。两个用于低约束比：收敛应力和膨胀应力。关于临界约束比的两种情况：各向同性和各向异性条件.一个是高约束比和各向同性海冰。利用EAP流变学，通过初始条件和强迫的修改，我们显示了应变率幂律的出现，与观察一致。这篇文章是“海冰现象的建模”主题的一部分。
The drift and deformation of sea ice floating on the polar oceans is caused by the applied wind and ocean currents. Over ocean basin length scales the internal stresses and boundary conditions of the sea ice pack result in observable deformation patterns. Cracks and leads can be observed in satellite images and within the velocity fields generated from floe tracking. In a climate sea ice model the deformation of sea ice over ocean basin length scales is modelled using a rheology that represents the relationship between stresses and deformation within the sea ice cover. Here we investigate the link between emergent deformation characteristics and the underlying internal sea ice stresses using the Los Alamos numerical sea ice climate model. We have developed an idealized square domain, focusing on the role of sea ice rheologies in producing deformation at spatial resolutions of up to 500 m. We use the elastic anisotropic plastic (EAP) and elastic viscous plastic (EVP) rheologies, comparing their stability, with the EAP rheology producing sharper deformation features than EVP at all space and time resolutions. Sea ice within the domain is forced by idealized winds, allowing for the emergence of five distinct deformation types. Two for a low confinement ratio: convergent and expansive stresses. Two about a critical confinement ratio: isotropic and anisotropic conditions. One for a high confinement ratio and isotropic sea ice. Using the EAP rheology and through the modification of initial conditions and forcing, we show the emergence of the power law of strain rate, in accordance with observations. This article is part of the theme issue ‘Modelling of sea-ice phenomena’.
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