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Combined obliquity and precession pacing of late Pleistocene deglaciations

机译:晚更新世冰期的倾斜和旋进步调

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摘要

Milankovitch1 proposed that Earth resides in an interglacial state when its spin axis both tilts to a high obliquity and precesses to align the Northern Hemisphere summer with Earth's nearest approach to the Sun. This general concept has been elaborated into hypotheses that precession, obliquity or combinations of both could pace deglaciations during the late Pleistocene. Earlier tests have shown that obliquity paces the late Pleistocene glacial cycles but have been inconclusive with regard to precession, whose shorter period of about 20,000 years makes phasing more sensitive to timing errors. No quantitative test has provided firm evidence for a dual effect. Here I show that both obliquity and precession pace late Pleistocene glacial cycles. Deficiencies in time control that have long stymied efforts to establish orbital effects on degradation are overcome using a new statistical test that focuses on maxima in orbital forcing. The results are fully consistent with Milankovitch's proposal but also admit the possibility that long Southern Hemisphere summers contribute to deglaciation.
机译:Milankovitch1提出,当地球的自转轴倾斜到很高的倾角,并且进动使北半球夏季与地球最接近太阳的方向一致时,地球处于冰间状态。该一般概念已被详细化为假说,旋进,倾斜或两者结合可能会在更新世晚期加速冰消。较早的测试表明,斜度可以加快晚更新世冰川周期的步伐,但是对于进动尚无定论,因为进动的较短时间约为20,000年,因此相位对时序误差更加敏感。没有定量测试提供了双重效应的确凿证据。在这里,我证明了倾斜和进动都可以加快晚更新世冰川周期的速度。长期以来一直在努力建立对退化的轨道效应的努力的时间控制上的缺陷可以通过使用一种新的统计检验来克服,该检验侧重于轨道强迫的最大值。结果与米兰科维奇的提议完全一致,但也承认南半球夏季较长可能导致冰消。

著录项

  • 来源
    《Nature》 |2011年第7376期|p.229-232|共4页
  • 作者

    Peter Huybers;

  • 作者单位

    Harvard University, Department of Earth and Planetary Sciences, 20 Oxford Street, Cambridge, Massachusetts 02138, 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);
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  • 正文语种 eng
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