The Shifting Distribution of Arctic Daily Temperatures Under Global Warming

IF 7.3 1区 地球科学 Q1 ENVIRONMENTAL SCIENCES Earths Future Pub Date : 2024-11-05 DOI:10.1029/2024EF004961
Céline Giesse, Dirk Notz, Johanna Baehr
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Abstract

We examine daily surface air temperatures (SAT) in the Arctic under global warming, synthesizing changes in mean temperature, variability, seasonality, and extremes based on five Earth system model large ensembles from the Coupled Model Intercomparison Project Phase 6. Our analysis shows that the distribution of daily Arctic SAT changes substantially, with Arctic mean temperatures being distinguishable from pre-industrial levels on 84% and 97% of days at 1.5 and 2°C of global warming, respectively, and on virtually every day at 3°C of global warming. This shift is primarily due to the rapid rise in average temperature resulting from Arctic amplification and is exacerbated by a decrease in the variability of daily Arctic SAT of approximately 8.5% per degree of global warming. The changes in mean temperature and variability are more pronounced in the cold seasons than in summer, resulting in a weakened and shifted seasonal cycle of Arctic SAT. Moreover, the intensity and frequency of warm and cold extreme events change to varying degrees. The hottest days warm slightly more, while the coldest days warm 4–5 times more than the global average temperature, making extreme cold events rare. Changes in local SAT vary regionally across the Arctic and are most significant in areas of sea-ice loss. Our findings underscore the Arctic's amplified sensitivity to global warming and emphasize the urgent need to limit global warming to mitigate impacts on human and natural systems.

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全球变暖下北极日温度分布的变化
我们根据耦合模式相互比较项目第六阶段的五个地球系统模式大集合,综合平均温度、变异性、季节性和极端温度的变化,研究了全球变暖下北极地区的日表面气温(SAT)。我们的分析表明,北极每天的 SAT 分布发生了很大变化,在全球变暖 1.5℃和 2℃的情况下,分别有 84% 和 97% 的天数北极平均气温与工业化前的水平不同,而在全球变暖 3℃的情况下,几乎每天的平均气温都与工业化前的水平不同。这种变化主要是由于北极放大导致平均气温快速上升,而全球变暖每升高一度,北极 SAT 的日变化率下降约 8.5%,加剧了这种变化。平均温度和变率的变化在寒冷季节比夏季更明显,导致北极 SAT 的季节周期减弱和偏移。此外,冷暖极端事件的强度和频率也发生了不同程度的变化。最热的日子气温略高,而最冷的日子气温是全球平均气温的 4-5 倍,因此极寒事件很少发生。在整个北极地区,当地 SAT 的变化因地区而异,在海冰消失的地区变化最为显著。我们的研究结果凸显了北极对全球变暖的敏感性,并强调迫切需要限制全球变暖,以减轻对人类和自然系统的影响。
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来源期刊
Earths Future
Earths Future ENVIRONMENTAL SCIENCESGEOSCIENCES, MULTIDI-GEOSCIENCES, MULTIDISCIPLINARY
CiteScore
11.00
自引率
7.30%
发文量
260
审稿时长
16 weeks
期刊介绍: Earth’s Future: A transdisciplinary open access journal, Earth’s Future focuses on the state of the Earth and the prediction of the planet’s future. By publishing peer-reviewed articles as well as editorials, essays, reviews, and commentaries, this journal will be the preeminent scholarly resource on the Anthropocene. It will also help assess the risks and opportunities associated with environmental changes and challenges.
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