arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1609.07119physics.ao-ph
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代表高度不确定的ice-sheet贡献的Sea-level预测

Sea-level projections representing deeply uncertain ice-sheet contributions

Alexander M. R. Bakker, Tony E. Wong, Kelsey L. Ruckert, Klaus Keller

摘要:

未来海平面上升对许多沿海社区构成了重大风险。管理这些风险往往依赖于IPCC提供的共识预测。然而,人们越来越意识到,周围的不确定性可能比通常所认为的要大得多。最近发表的海平面预测出现了很大的分歧和高度敏感的非平凡的模型选择和西南极冰盖(WAIS)可能比以前认为的更不稳定,使快速解体。作为回应,一些机构已经宣布相应地更新其预测。在这里,我们提出了一套概率海平面预测近似深度不确定WAIS的贡献。这些预测旨在通过澄清对非平凡或有争议的假设的敏感性,为稳健的决策提供信息。我们表明,非常不确定的WAIS贡献可以在几十年内主导其他不确定性。这些深刻的不确定性要求制定强有力的适应战略。这些决策需要,反过来,需要面向任务的基础科学,例如关于潜在的路标和WAIS引起的海平面变化的最大速率。

英文摘要:

Future sea-level rise poses nontrivial risks for many coastal communities. Managing these risks often relies on consensus projections like those provided by the IPCC. Yet, there is a growing awareness that the surrounding uncertainties may be much larger than typically perceived. Recently published sea-level projections appear widely divergent and highly sensitive to non-trivial model choices and the West Antarctic Ice Sheet (WAIS) may be much less stable than previously believed, enabling a rapid disintegration. In response, some agencies have already announced to update their projections accordingly. Here, we present a set of probabilistic sea-level projections that approximate deeply uncertain WAIS contributions. The projections aim to inform robust decisions by clarifying the sensitivity to non-trivial or controversial assumptions. We show that the deeply uncertain WAIS contribution can dominate other uncertainties within decades. These deep uncertainties call for the development of robust adaptive strategies. These decision-making needs, in turn, require mission-oriented basic science, for example about potential signposts and the maximum rate of WAIS induced sea-level changes.

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