The stability of grounding lines on retrograde slopes
The stability of grounding lines on retrograde slopes
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DOI：
10.5194/tc-6-1497-2012
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发表时间：
2012-01-01
期刊：
影响因子：
5.2
通讯作者：
Gagliardini, O.
中科院分区：
文献类型：
--
作者：
Gudmundsson, G. H.;Krug, J.;Gagliardini, O.
在两个水平维度上对基于在整体流动方向上向上倾斜的海床的海洋冰盖的稳定性进行了数值研究。我们给出了在这种逆坡上稳定的接地线的例子，说明海洋冰盖在两个水平维度上并非无条件不稳定。海洋冰盖接地线处的逆坡，比如西南极冰盖（WAIS），其本身并不意味着不稳定，也不意味着这些区域接近不稳定阈值。因此，我们对那些仅仅基于西南极冰盖位于逆坡上就必然固有不稳定这一观点而对其在近期可能对全球海平面变化的贡献所做的估计提出质疑。
The stability of marine ice sheets grounded on beds that slope upwards in the overall direction of flow is investigated numerically in two horizontal dimensions. We give examples of stable grounding lines on such retrograde slopes illustrating that marine ice sheets are not unconditionally unstable in two horizontal dimensions. Retrograde bed slopes at the grounding lines of marine ice sheets, such as the West Antarctic Ice Sheet (WAIS), do not per se imply an instability, nor do they imply that these regions are close to a threshold of instability. We therefore question those estimates of the potential near-future contribution of WAIS to global sea level change based solely on the notion that WAIS, resting on a retrograde slope, must be inherently unstable.