Persistent orbital influence on millennial climate variability through the Pleistocene

Sun, Youbin; McManus, Jerry F; Clemens, Steven C.; Zhang, Xu; Vogel, Hendrik; Hodell, David A; Guo, Fei; Wang, Ting; Liu, Xingxing; An, Zhisheng

doi:10.1038/s41561-021-00794-1

Cited by 52 publications

(51 citation statements)

References 55 publications

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“…We show that the precession forcing plays an important role in driving the glacial cycles before the MPT: (1) the precession forcing determines the timing of the threshold for deglaciation, while obliquity also supports the deglaciations of the 41-kyr glacial cycles; (2) the lead-lag relationship between precession and obliquity forcings determines the length of the interglacials and the shape of the glacial cycles; and (3) a thin and extensive North American ice sheet forms and retreats within one precession cycle when eccentricity is su ciently large. These ndings quantitatively support the recent discussions suggesting the importance of precession forcing on climate variabilities during the EP 18, [23][24][25]29 . The variations in the SH ice sheet may help to completely weaken signals from the ~ 20 kyr periodicity of precession forcing from sea-level records during the EP 21,22 .…”

Section: Discussionsupporting

confidence: 89%

“…Several mechanisms have been proposed to resolve the 41-kyr problem, including the anticorrelation between the strength of summer insolation and the length of summer 19,20 and the offset of the 20-kyr component between the variations of the NH and the Southern Hemisphere (SH) ice sheets 21,22 . Some studies infer the importance of precession in pacing the 41-kyr glacial cycles 18, [23][24][25] , although the role of precession forcing during the EP has been unclear partly due to its short periodicity in comparison to the large age model uncertainty. The existence of asymmetry has also been inferred for the pre-MPT periods based on statistical analyses 4,[26][27][28] .…”

Section: Introductionmentioning

confidence: 99%

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Role of astronomical forcing in shaping the 41-kyr glacial cycles before the Middle Pleistocene Transition

Watanabe¹,

Abe‐Ouchi

Saito

et al. 2022

Preprint

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Glacial cycles during the Early Pleistocene (EP) are characterized by a dominant 41-kyr periodicity and amplitudes smaller than those of glacial cycles with ~ 100-kyr periodicity during the Late Pleistocene (LP). However, it remains unclear how the 41-kyr glacial cycles during EP respond to Earth’s astronomical forcings. Here we employ a three-dimensional ice-sheet model to simulate the glacial cycles at ~ 1.6–1.2 Ma and analyse the phase angle of precession and obliquity at each deglaciation. We show that each deglaciation occurs at every other precession minimum, when obliquity is large. This behaviour is explained by a threshold mechanism determined by ice-sheet size and astronomical forcings. The lead-lag relationship between precession and obliquity controls the length of each glacial/interglacial period. The large amplitudes of obliquity and eccentricity during this period help to establish robust 41-kyr glacial cycles. These findings support the combined role of astronomical forcings common for both EP and LP.

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Section: Discussionsupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Role of astronomical forcing in shaping the 41-kyr glacial cycles before the Middle Pleistocene Transition

Watanabe¹,

Abe‐Ouchi

Saito

et al. 2022

Preprint

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“…MCV is thought to be a pervasive feature of Quaternary climate change (Jouzel et al, 2007;Weirauch et al, 2008;Hodell et al, 2015;Sun et al, 2021), but its pacing and amplitude are likely to be influenced by changing orbital and ice sheet boundary conditions. Expedition 397 is aimed at assessing the influence of the climate background state on the nature of MCV and its cause(s) during the Quaternary.…”

Section: Millennial-scale Variability During the Pliocene-pleistocenementioning

confidence: 99%

Expedition 397 Scientific Prospectus: Iberian Margin Paleoclimate

Hodell¹,

Abrantes²,

Zarikian³

2022

International Ocean Discovery Program Scientific Prospectus

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Portions of this work may have been published in whole or in part in other IODP documents or publications.This IODP Scientific Prospectus is based on precruise JOIDES Resolution Facility advisory panel discussions and scientific input from the designated Co-Chief Scientists on behalf of the drilling proponents. During the course of the cruise, actual site operations may indicate to the Co-Chief Scientists, the Expedition Project Manager/Staff Scientist, and the Operations Superintendent that it would be scientifically or operationally advantageous to amend the plan detailed in this prospectus. It should be understood that any substantial changes to the science deliverables outlined in the plan presented here are contingent upon the approval of the IODP JRSO Director and/or JOIDES Resolution Facility Board.

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“…A number of well-dated, high-resolution speleothem ẟ 18 O records have been developed in recent years (Wang et al, 2008;Cheng et al, 2016), providing the opportunity to examine the underlying relationship(s) between East Asian monsoon MMV and potential longer-term (orbital-scale) modulators. The latest research suggests that the MMV through the Pleistocene is influenced by both glacial boundary condition and orbital configurations (Sun et al, 2021b). Cheng et al, (2016) hypothesized, on the basis of an East Asian composite speleothem ẟ 18 O record (ẟ 18 Osp), that periods of maximum Northern Hemisphere summer insolation correspond to weaker millennial-scale variability.…”

Section: Introductionmentioning

confidence: 99%

Greenhouse gases modulate the strength of millennial-scale subtropical rainfall, consistent with future predictions

Guo

Clemens

Liu

et al. 2022

Preprint

Self Cite

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Abstract. Millennial-scale East Asian monsoon variability is closely associated with natural hazards through long-term variability in flood and drought cycles. Therefore, exploring what drives the millennial-scale variability is of significant importance for future prediction of extreme climates. Here we present a new East Asian summer monsoon (EASM) rainfall reconstruction from the northwest Chinese loess plateau spanning the past 650 kyr. The magnitude of millennial-scale variability (MMV) in EASM rainfall is linked to ice volume and greenhouse gas (GHG) at the 100-kyr earth-orbital eccentricity band and to GHG and summer insolation at the precession band. At the glacial-interglacial cycle, gradual changes in CO2 at times of intermediate ice volume leads to increased variability in North Atlantic stratification and Atlantic meridional overturning circulation, propagating abrupt climate changes into East Asia via the westerlies. Within the 100-kyr cycle precession variability further enhances the response, showing that stronger insolation and increased atmospheric GHG cause increases in the MMV of EASM rainfall. These findings indicate increased extreme precipitation events under future warming scenarios, consistent with model results.

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Persistent orbital influence on millennial climate variability through the Pleistocene

Cited by 52 publications

References 55 publications

Role of astronomical forcing in shaping the 41-kyr glacial cycles before the Middle Pleistocene Transition

Role of astronomical forcing in shaping the 41-kyr glacial cycles before the Middle Pleistocene Transition

Expedition 397 Scientific Prospectus: Iberian Margin Paleoclimate

Greenhouse gases modulate the strength of millennial-scale subtropical rainfall, consistent with future predictions

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