Representation of basal melting at the grounding line in ice flow models
Representation of basal melting at the grounding line in ice flow models
复制标题
冰流模型中接地线处基底融化的表示
DOI:
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发表时间:
2018
期刊:
影响因子:
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通讯作者:
Mathieu Morlighem
中科院分区:
文献类型:
--
作者:
H. Seroussi;Mathieu Morlighem
Abstract. While a lot of attention has been given to the numerical implementation of
grounding lines and basal friction in the grounding zone, little has been
done about the impact of the numerical treatment of ocean-induced basal
melting in this region. Several strategies are currently being employed in
the ice sheet modeling community, and the resulting grounding line dynamics
may differ strongly, which ultimately adds significant uncertainty to the
projected contribution of marine ice sheets to sea level rise. We investigate
here several implementations of basal melt parameterization on partially
floating elements in a finite-element framework, based on the Marine Ice
Sheet–Ocean Model Intercomparison Project (MISOMIP) setup: (1) melt applied
only to entirely floating elements, (2) melt applied over all elements that
are crossed by the grounding line, and (3) melt integrated partially over the
floating portion of a finite element using two different sub-element
integration methods. All methods converge towards the same state when the
mesh resolution is fine enough. However, (2) and (3) will systematically
overestimate the rate of grounding line retreat in coarser resolutions, while
(1) converges faster to the solution in most cases. The differences between
sub-element parameterizations are exacerbated for experiments with high
melting rates in the vicinity of the grounding line and for a Weertman
sliding law. As most real-world simulations use horizontal mesh resolutions
of several hundreds of meters at best, and high melt rates are generally
present close to the grounding lines, we recommend not using (3) to avoid
overestimating the rate of grounding line retreat and to carefully assess the
impact of mesh resolution and sub-element melt parameterizations on all
simulation results.
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