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The timing of Pleistocene glaciations from a simple multiple-state climate model

机译:一个简单的多态气候模型的更新世冰川期

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摘要

The Earth's climate over the past million years has been characterized by a succession of cold and warm periods, known as glacial-interglacial cycles, with periodicities corresponding to those of the Earth's main orbital parameters; precession (23kyr), obliquity (41kyr) and eccentricity (100 kyr). The astronomical theory of climate, in which the orbital variations are taken to drive the climate changes, has been very successful in explaining many features of the palaeoclimate records. Nevertheless, the timing of the main glacial and interglacial periods remains puzzling in many respects. In particular, the main glacial-interglacial switches occur approximately every 100 kyr, but the changes in insolation forcing are very small in this frequency band. Similarly, an especially warm interglacial episode, about 400,000 years ago, occurred at a time when insolation variations were minimal. Here I propose that multiple equilibria in the climate system can provide a resolution of these problems within the framework of astronomical theory. I present two simple models that successfully simulate each glacial-interglacial cycle over the late Pleistocene epoch at the correct time and with approximately the correct amplitude. Moreover, in a simulation over the past 2 million years, the onset of the observed prominent ~100-kyr cycles around 0.8 to 1 million years ago is correctly reproduced.
机译:在过去的一百万年中,地球气候的特征是连续的冷,暖期,即冰川间冰期,其周期与地球的主要轨道参数相对应。进动(23kyr),倾角(41kyr)和偏心率(100 kyr)。气候的天文学理论,通过轨道变化来驱动气候变化,在解释古气候记录的许多特征方面非常成功。然而,主要冰川期和冰川间期的时间安排在许多方面仍然令人困惑。特别是,主要的冰晶间转换大约每100 kyr发生一次,但是在该频段内日射强迫的变化很小。同样,大约40万年前的一次特别温暖的冰川间期发生在日照变化最小的时候。在这里,我建议气候系统中的多重平衡可以在天文学理论的框架内解决这些问题。我提出了两个简单的模型,它们分别在正确的时间和大约正确的振幅下成功地模拟了更新世晚期的每个冰川-冰川间的周期。此外,在过去200万年的模拟中,正确再现了大约0.8到1百万年前观察到的约100 kyr周期的开始。

著录项

  • 来源
    《Nature》 |1998年第6665期|p.378-381|共4页
  • 作者

    Didier Paillard;

  • 作者单位
  • 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
  • 中图分类 自然科学总论;
  • 关键词

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