Improvements in one-dimensional grounding-line parameterizations in an ice-sheet model with lateral variations
Improvements in one-dimensional grounding-line parameterizations in an ice-sheet model with lateral variations
复制标题
具有横向变化的冰盖模型中一维接地线参数化的改进
DOI:
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发表时间:
2020
期刊:
影响因子:
--
通讯作者:
R. DeConto
中科院分区:
文献类型:
--
作者:
D. Pollard;R. DeConto
Abstract. The use of a boundary-layer parameterization of buttressing and ice flux across grounding lines in a two-dimensional ice-sheet model is improved by allowing general orientations of the grounding line. This and another modification to the model's grounding-line parameterization are assessed in two settings: a narrow fjord-like domain (MISMIP+), and in future simulations of West Antarctic ice retreat under RCP8.5-based climates. The new modifications are found to have significant effects on the fjord results, which are now within the envelopes of other models in the MISMIP+ intercomparison. In contrast, the modifications have little effect on West Antarctic retreat, presumably because dynamics in the wider major Antarctic basins are adequately represented by the model's previous simpler one-dimensional formulation. As future grounding lines retreat across very deep bedrock topography in the West Antarctic simulations, buttressing is weak and deviatoric stress measures exceed the ice yield stress, implying that structural failure at these grounding lines would occur. We suggest that these grounding-line quantities should be examined in similar projections by other ice models, to better assess the potential for future structural failure.
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影响因子:
64.8
作者:
Golledge, N. R.;Kowalewski, D. E.;Gasson, E. G. W.
通讯作者:
Gasson, E. G. W.
影响因子:
5.2
作者:
Gudmundsson, G. H.
通讯作者:
Gudmundsson, G. H.
影响因子:
30.7
作者:
Fuerst, Johannes Jakob;Durand, Gael;Gagliardini, Olivier
通讯作者:
Gagliardini, Olivier
影响因子:
5.2
作者:
Arthern, Robert J.;Williams, C. Rosie
通讯作者:
Williams, C. Rosie
DOI:
10.5194/tc-2019-326
发表时间:
2020
期刊:
--
影响因子:
--
作者:
Cornford S
通讯作者:
Cornford S