Incorporating modelled subglacial hydrology into inversions for basal drag

Incorporating modelled subglacial hydrology into inversions for basal drag
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将模拟的冰下水文纳入基础阻力反演中

DOI:
10.5194/tc-11-2783-2017
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发表时间:
2017
期刊:
The Cryosphere
影响因子:
--
通讯作者:
Neil Arnold
Neil Arnold
中科院分区:
--
文献类型:
--
作者:
Conrad P. Koziol;Conrad P. Koziol;Neil Arnold

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抽象的。模拟冰-流-冰下水文学耦合的一个关键挑战是初始化系统的状态和参数。我们通过介绍在夏季融化季节开始时初始化这些值的工作流程来解决这个问题。工作流程依赖于为冬季运行冰川下水文模型,当系统不受融化水输入的影响时,可以假设冰的速度是恒定的。冰下水文模型冬季运行的关键参数是通过使用线性滑动定律从基面阻力的初始反演中确定的。利用作为水压函数的非线性滑动定律,将冬季结束时冰下水文模型的状态并入基本阻力的反演中。我们在拉塞尔冰川地区演示了这一过程,并将线性滑动律和两个非线性滑动律的输出进行了比较。此外,我们将模拟的冬季水文状态与雷达观测进行了比较,发现它与夏季的观测结果一致,而不是冬季的观测结果。
Abstract. A key challenge in modelling coupled ice-flow–subglacial hydrology is initializing the state and parameters of the system. We address this problem by presenting a workflow for initializing these values at the start of a summer melt season. The workflow depends on running a subglacial hydrology model for the winter season, when the system is not forced by meltwater inputs, and ice velocities can be assumed constant. Key parameters of the winter run of the subglacial hydrology model are determined from an initial inversion for basal drag using a linear sliding law. The state of the subglacial hydrology model at the end of winter is incorporated into an inversion of basal drag using a non-linear sliding law which is a function of water pressure. We demonstrate this procedure in the Russell Glacier area and compare the output of the linear sliding law with two non-linear sliding laws. Additionally, we compare the modelled winter hydrological state to radar observations and find that it is in line with summer rather than winter observations.
DOI: 10.1038/ngeo1737
发表时间: 2013-03-01
期刊: NATURE GEOSCIENCE
影响因子: 18.3
作者:
Chandler, D. M.;Wadham, J. L.;Hubbard, A.
通讯作者: Hubbard, A.
DOI: 10.1038/ngeo863
发表时间: 2010-06-01
期刊: NATURE GEOSCIENCE
影响因子: 18.3
作者:
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