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Globally resolved surface temperatures since the Last Glacial Maximum

机译:自上次冰川最大值以来全球解决的表面温度

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摘要

Climate changes across the past 24,000 years provide key insights into Earth system responses to external forcing. Climate model simulations(1,2) and proxy data(3-8) have independently allowed for study of this crucial interval; however, they have at times yielded disparate conclusions. Here, we leverage both types of information using paleoclimate data assimilation(9,10) to produce the first proxy-constrained, full-field reanalysis of surface temperature change spanning the Last Glacial Maximum to present at 200-year resolution. We demonstrate that temperature variability across the past 24 thousand years was linked to two primary climatic mechanisms: radiative forcing from ice sheets and greenhouse gases; and a superposition of changes in the ocean overturning circulation and seasonal insolation. In contrast with previous proxy-based reconstructions(6,7) our results show that global mean temperature has slightly but steadily warmed, by ~0.5 degrees C, since the early Holocene (around 9 thousand years ago). When compared with recent temperature changes(11), our reanalysis indicates that both the rate and magnitude of modern warming are unusual relative to the changes of the past 24 thousand years.Paleoclimate datasets are integrated with a climate model to reconstruct global surface temperature since the Last Glacial Maximum, showing sustained warming until the mid-Holocene.
机译:过去24,000年的气候变化为地球系统对外部迫使的反应提供了关键洞察。气候模型模拟(1,2)和代理数据(3-8)独立允许研究这种至关重要的间隔;然而,它们有时会产生不同的结论。在这里,我们使用古平衡数据同化(9,10)利用这两种类型的信息来生产第一次受约束的表面温度变化,跨越200年的最大冰川最大值的表面温度变化。我们证明过去24千年来的温度变异与两个主要气候机制相关联:从冰盖和温室气体中辐射强制迫使;并叠加了海洋倾覆流通和季节性缺失的变化。与先前的基于代理的重建相比(6,7),我们的结果表明,全球平均温度略微但稳定地温暖,〜0.5摄氏度,自全新世(大约9千年以前)。与最近的温度变化相比(11)相比,我们的再分析表明,现代变暖的速率和幅度相对于过去24千年的变化是不寻常的。与气候模型相结合,以重建自全球表面温度最后的冰川最大值,表现出持续变暖,直到中东地区。

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  • 来源
    《Nature》 |2021年第7884期|239-244|共6页
  • 作者单位

    Univ Arizona Dept Geosci Tucson AZ 85721 USA;

    Univ Arizona Dept Geosci Tucson AZ 85721 USA;

    Natl Ctr Atmospher Res Climate & Global Dynam Lab POB 3000 Boulder CO 80307 USA;

    Univ Washington Dept Atmospher Sci Seattle WA 98195 USA;

    Univ Washington Dept Atmospher Sci Seattle WA 98195 USA;

    Univ Arizona Dept Geosci Tucson AZ 85721 USA;

    Univ Michigan Dept Earth & Environm Sci Ann Arbor MI 48109 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
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