Parameter sensitivity analysis of dynamic ice sheet models – numerical computations
Parameter sensitivity analysis of dynamic ice sheet models – numerical computations
复制标题
动态冰盖模型的参数敏感性分析 - 数值计算
DOI：
10.5194/tc-14-673-2020
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Per Lötstedt
中科院分区：
文献类型：
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作者：
G. Cheng;Per Lötstedt
抽象的。摩擦系数和基础地形的静止和动态冰盖扰动的冰的两个模型：完整的斯托克斯方程和浅架近似。通过求解应力和高度方程的伴随方程来量化对表面处的速度和高度的扰动的敏感性，所述伴随方程为扰动数据提供权重。伴随方程的数值求解和灵敏度计算在几个例子中的两个维度。传递矩阵将底部的扰动与顶部的扰动耦合。与简化问题的解析解进行了比较。对扰动的灵敏度取决于它们的波长和到接地线的距离。地形上的扰动对上面的冰面有直接影响，而摩擦系数的变化在那里不太明显。
Abstract. The friction coefficient and the base topography of a stationary and a dynamic ice sheet are perturbed in two models for the ice: the full Stokes equations and the shallow shelf approximation. The sensitivity to the perturbations of the velocity and the height at the surface is quantified by solving the adjoint equations of the stress and the height equations providing weights for the perturbed data. The adjoint equations are solved numerically and the sensitivity is computed in several examples in two dimensions. A transfer matrix couples the perturbations at the base with the perturbations at the top. Comparisons are made with analytical solutions to simplified problems. The sensitivity to perturbations depends on their wavelengths and the distance to the grounding line. A perturbation in the topography has a direct effect at the ice surface above it, while a change in the friction coefficient is less visible there.
冰升的运动响应划分对海洋和大气强迫变化的影响
DOI：
10.5194/tc-13-2673-2019
发表时间：
2019
期刊：
The Cryosphere
影响因子：
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作者：
C. Schannwell;R. Drews;T. A. Ehlers;O. Eisen;C. Mayer;F. Gillet Chaulet
通讯作者：
F. Gillet Chaulet