Quantifying the Impact of Bedrock Topography Uncertainty in Pine Island Glacier Projections for This Century

Quantifying the Impact of Bedrock Topography Uncertainty in Pine Island Glacier Projections for This Century
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量化本世纪松岛冰川预测中基岩地形不确定性的影响

DOI:
10.1029/2021gl096589
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发表时间:
2022
影响因子:
5.2
通讯作者:
S. Cornford
S. Cornford
中科院分区:
地球科学1区
文献类型:
--
作者:
A. Wernecke;T. Edwards;P. Holden;N. Edwards;S. Cornford

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预测南极对全球平均海平面上升的贡献是所有主要来源中最不确定的。部分原因是深盆地冰流的不稳定机制。基岩地形的误差会严重影响冰川对这种不稳定性的预期恢复力。在这里,我们分析了松岛冰川地形,得出一个统计模型表示。我们的模型允许不均匀和空间相关的不确定性,并避免不必要的平滑空间平均或插值。一组地形实现生成代表我们最好的估计冰盖模型模拟的地形不确定性。根据摩擦定律和气候强迫,仅基岩的不确定性就造成了2100年预测海平面上升贡献的5%-25%的不确定性。松岛冰川模拟在这个新的设置是一致的模拟在BedMachine参考地形,但从Bedmap 2模拟发散。
The predicted Antarctic contribution to global‐mean sea‐level rise is one of the most uncertain among all major sources. Partly this is because of instability mechanisms of the ice flow over deep basins. Errors in bedrock topography can substantially impact the projected resilience of glaciers against such instabilities. Here we analyze the Pine Island Glacier topography to derive a statistical model representation. Our model allows for inhomogeneous and spatially dependent uncertainties and avoids unnecessary smoothing from spatial averaging or interpolation. A set of topography realizations is generated representing our best estimate of the topographic uncertainty in ice sheet model simulations. The bedrock uncertainty alone creates a 5%–25% uncertainty in the predicted sea level rise contribution at year 2100, depending on friction law and climate forcing. Pine Island Glacier simulations on this new set are consistent with simulations on the BedMachine reference topography but diverge from Bedmap2 simulations.
DOI: 10.1038/nclimate2094
发表时间: 2014-02-01
影响因子: 30.7
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