Committed sea-level rise under the Paris Agreement and the legacy of delayed mitigation action.

Committed sea-level rise under the Paris Agreement and the legacy of delayed mitigation action.
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DOI:
10.1038/s41467-018-02985-8
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发表时间:
2018-02-20
影响因子:
16.6
通讯作者:
Schleussner CF
Schleussner CF
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Mengel M;Nauels A;Rogelj J;Schleussner CF

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海平面上升是气候变化的一个主要后果,在温室气体排放停止后,这种变化仍将持续很长时间。 2015 年《巴黎协定》旨在通过将温室气体排放量减少至净零并限制全球平均气温上升来降低与气候相关的风险。在这里,我们量化了 2300 年之前这些限制因素对全球海平面上升的影响,包括南极冰盖的不稳定。我们估计,如果温室气体净零排放持续到 2300 年,海平面中位数将上升 0.7 至 1.2 米,具体取决于本世纪的排放路径。温度稳定在 2°C 以下不足以将 2300 年海平面平均上升幅度控制在 1.5 米以下。我们发现,二氧化碳排放量近期峰值每延迟 5 年,2300 年海平面上升预估中值就会增加约 10 年。 0.2米,第95个百分位数的极端海平面上升估计高达1米。我们的结果强调了近期缓解行动对于限制长期海平面上升风险的重要性。海平面上升是当前和未来气候变化的遗产。作者在这里表明,根据《巴黎协定》,未来几十年的排放量对未来几个世纪海平面上升的程度有很大影响,其中不确定性主要由冰盖的贡献决定。
Sea-level rise is a major consequence of climate change that will continue long after emissions of greenhouse gases have stopped. The 2015 Paris Agreement aims at reducing climate-related risks by reducing greenhouse gas emissions to net zero and limiting global-mean temperature increase. Here we quantify the effect of these constraints on global sea-level rise until 2300, including Antarctic ice-sheet instabilities. We estimate median sea-level rise between 0.7 and 1.2 m, if net-zero greenhouse gas emissions are sustained until 2300, varying with the pathway of emissions during this century. Temperature stabilization below 2 °C is insufficient to hold median sea-level rise until 2300 below 1.5 m. We find that each 5-year delay in near-term peaking of CO2 emissions increases median year 2300 sea-level rise estimates by ca. 0.2 m, and extreme sea-level rise estimates at the 95th percentile by up to 1 m. Our results underline the importance of near-term mitigation action for limiting long-term sea-level rise risks. Rising seas are a legacy of present and future climate change. Here the authors show that under the Paris Agreement, emissions in the next decades have a strong influence on the amount of sea level rise in the centuries to come, with the uncertainty dominated by ice-sheet contributions.
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