Abstract
Changes in the magnitude of millennial-scale climate variability (MCV) during the Late Pleistocene occur as a function of changing background climate state over tens of thousands of years, an indirect consequence of slowly varying incoming solar radiation associated with changes in Earth’s orbit. However, whether astronomical forcing can stimulate MCV directly (without a change in the background state) remains to be determined. Here we use a comprehensive fully coupled climate model to demonstrate that orbitally driven insolation changes alone can give rise to spontaneous millennial-scale climate oscillations under intermediate glacial conditions. Our results demonstrate that an abrupt transition from warm interstadial to cold stadial conditions can be triggered directly by a precession-controlled increase in low-latitude boreal summer insolation and/or an obliquity-controlled decrease in high-latitude mean annual insolation, by modulating North Atlantic low-latitude hydroclimate and/or high-latitude sea ice–ocean–atmosphere interactions, respectively. Furthermore, contrasting insolation effects over the tropical versus subpolar North Atlantic, exerted by obliquity or precession, result in an oscillatory climate regime, even within an otherwise stable climate. With additional sensitivity experiments under different glacial–interglacial climate backgrounds, we synthesize a coherent theoretical framework for climate stability, elaborating the direct and indirect (dual) control by Earth’s orbital cycles on millennial-scale climate variability during the Pleistocene.
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Data availability
The palaeoclimate records used in this paper are available at the following sources: ref. 2, benthic δ18O stack, https://doi.pangaea.de/10.1594/PANGAEA.704257; ref. 37, CO2 data, http://onlinelibrary.wiley.com/store/10.1002/2014GL061957/asset/supinfo/grl52461-sup-0003-supplementary.xls?v=1&s=e77ad89c3925111330671009ab40eac65e019d01; ref. 50, ODP983 NPS data, https://doi.pangaea.de/10.1594/PANGAEA.904398. The model data that supports the key findings of this study are available in National Tibetan Plateau Data Center (TPDC) at https://doi.org/10.11888/Paleoenv.tpdc.271670.
Code availability
The standard model code of the ‘Community Earth System Models’ (COSMOS) version COSMOS-landveg r2413 (2009) is available upon request from the ‘Max Planck Institute for Meteorology’ in Hamburg (https://www.mpimet.mpg.de). Post-processing of the model output and model data analysis were performed with CDO (Climate Data Operators, version 1.9.5 and 1.9.10, https://code.mpimet.mpg.de/projects/cdo).
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Acknowledgements
We thank colleagues at the Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research in Bremerhaven for maintaining the supercomputer. The study is supported by the Basic Science Center for Tibetan Plateau Earth System (BSCTPES, NSFC project no. 41988101), the Natural Science Foundation of China (no. 42075047) and the German Helmholtz Postdoc Program (PD-301). We also acknowledge financial support from UK NERC (grants nos. NE/J008133/1 and NE/L006405/1) to S.B. and the German BMBF funded project PalMod (01LP1504A, 01LP1915A and 01LP1916B) and the PACES programme of the AWI to G.K. and G.L. A sabbatical visit by R.D. to AWI was financially supported by the Faculty of Science at the University of Melbourne.
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Extended data
Extended Data Fig. 1 Climate characteristics of E40ka_CTL control run.
a, AMOC index in E40ka_CTL and its response to freshwater hosing (E40ka_FWF). The hosing lasts for 500 years, starting from the 0th year before which is the control experiment E40ka_CTL. b, c Mean annual SIC and barotropic stream function (SF, units: Sv) under 40ka BP conditions57. d, e same as b, c, but under the LGM boundary conditions (E40ka_CTL).
Extended Data Fig. 2 Oscillating dynamics in the scenario with varying (a-e, TRN40ka) and constant (f-j, E40ka_34kaOrb) orbital configurations.
a) and e) for AMOC index (units: Sv); b) and g) for sea surface temperature (units: °C), c) and h) for sea ice concentration (SIC, units: %), d) and i) for subsurface sea temperature (units: °C) in the key convection sites of the NA; e) and j) for meridional salt water transportation along 43°N (units: Sv) in the NA. We calculate the regional averages of SST, SIC and subsurface T in the northeastern NA (30°W-10°W, 50°-65°N). Bold lines show the 30-year running mean of the original data (thin grey lines). Bold lines show the 30-year running mean of the original data (thin grey lines). The short blue and red bold lines in (a) and (f) correspond to selected time intervals representing stadial and interstadial periods, respectively, which are used to calculate composite anomalies between strong and weak AMOC phases in Extended Data Fig. 3 and 7a, b. Note that length of these lines indicates length of time intervals.
Extended Data Fig. 3 Climate changes during stadial-to-interstadial transitions in TRN40ka (a-b) and E40ka_34kaOrb (c-d).
a, b Composite surface temperature anomalies between simulated strong and weak AMOC phases as indicated by short red and blue bold lines in Extended Data Fig. 3a, f. c, d, same as (a) and (b), but for precipitation. The dots represent qualitatively the corresponding changes in paleoclimate proxy records as shown in Extended Data Table 2 and 3.
Extended Data Fig. 4 Oscillating dynamics in the scenario with lowered eccentricity-modulated precession (a-e, E40ka_34kaEP) and obliquity (f-j, E40ka_34kaObl).
a) and e) for AMOC index (units: Sv); b) and g) for sea surface temperature (units: °C), c) and h) for sea ice concentration (SIC, units: %), d) and i) for subsurface sea temperature (units: °C) in the key convection sites of the NA; e) and j) for meridional salt water transportation along 43°N (units: Sv) in the NA. We calculate the regional averages of SST, SIC and subsurface T in the northeastern NA (30°W-10°W, 50°-65°N). Bold lines show the 30-year running mean of the original data (thin grey lines).
Extended Data Fig. 5 Triggering dynamics regarding lowered obliquity (a-c, E40ka_34kaObl) or eccentricity-modulated precession (d-i, E40ka_34kaEP).
a, b, c, Annual mean anomalies of surface air temperature (SAT, units: °C), SIC (shaded, units: %) and mixed layer depth (contour, units: m), and sea level pressure (SLP, contour, units: Pa), total net freshwater flux into the ocean (TNFWF, shaded, units: mm·day-1) and vertical integrated moisture transport (VIMT, vector, units: kg·m-1s-1) between the 100-year average before the onset of its initial transition into a weak AMOC phase in E40ka_34kaObl and that in the control run E40ka_CTL; d, e, f, same as a, b, c, but for annual mean anomalies between 40-year average before the onset of its initial transition into a weak AMOC phase in E40ka_34kaEP and that in E40ka_CTL; g, h, i, same as d, e, f, but for boreal summer mean anomalies.
Extended Data Fig. 6 Governing dynamics of precession-induced tropical NA hydroclimate changes.
a. Mean annual precipitation anomaly between high and low boreal summer insolation scenarios under LGM conditions in coupled model COSMOS. b – f. Mean annual precipitation anomalies of AGCM sensitivity runs in contrast to the AGCM control run (Methods, Extended Data Table 1).
Extended Data Fig. 7 Simulated AMOC states in the transient experiment under intermediate glacial conditions and equilibrium experiments under peak glacial and interglacial conditions.
a, b AMOC states in the composited weak and strong phases of oscillatory regime in TRN40ka, representing stadial and interstadial AMOC state. c, d, e, f are equilibrated AMOC states in orbital sensitivity runs under the LGM conditions. g, h, i, j same as c-f but under the pre-industrial conditions.
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Zhang, X., Barker, S., Knorr, G. et al. Direct astronomical influence on abrupt climate variability. Nat. Geosci. 14, 819–826 (2021). https://doi.org/10.1038/s41561-021-00846-6
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DOI: https://doi.org/10.1038/s41561-021-00846-6
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Rapid Laurentide Ice Sheet growth preceding the Last Glacial Maximum due to summer snowfall
Nature Geoscience (2024)
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Iberian Margin surface ocean cooling led freshening during Marine Isotope Stage 6 abrupt cooling events
Nature Communications (2023)
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Millennial-scale climate variability in the Northern Hemisphere influenced glacier dynamics in the Alps around 250,000 years ago
Communications Earth & Environment (2023)
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The role of Northern Hemisphere summer insolation for millennial-scale climate variability during the penultimate glacial
Communications Earth & Environment (2023)