Persistent influence of precession on northern ice sheet variability since the early Pleistocene

Author:

Barker Stephen1ORCID,Starr Aidan1ORCID,van der Lubbe Jeroen2ORCID,Doughty Alice3ORCID,Knorr Gregor4ORCID,Conn Stephen1,Lordsmith Sian1ORCID,Owen Lindsey1,Nederbragt Alexandra1ORCID,Hemming Sidney5,Hall Ian1,Levay Leah6ORCID,Berke M. A.7,Brentegani L.8,Caley T.9,Cartagena-Sierra A.7,Charles C. D.10,Coenen J. J.11,Crespin J. G.9,Franzese A. M.12,Gruetzner J.13,Han X.14,Hines S. K. V.15,Jimenez Espejo F. J.16,Just J.17,Koutsodendris A.18,Kubota K.19,Lathika N.20,Norris R. D.10,Periera dos Santos T.21,Robinson R.22,Rolison J. M.23,Simon M. H.24,Tangunan D.25,Yamane M.26,Zhang H.27,

Affiliation:

1. School of Earth and Environmental Sciences, Cardiff University, Cardiff, UK.

2. Department of Earth Sciences, Vrije Universiteit Amsterdam, Amsterdam, Netherlands.

3. School of Earth and Climate Sciences, University of Maine, Orono, ME, USA.

4. Alfred Wegener Institute, Bremerhaven, Germany.

5. Lamont-Doherty Earth Observatory, Columbia University, New York, NY, USA.

6. International Ocean Discovery Program, Texas A&M University, College Station, TX, USA.

7. Department of Civil Engineering & Geological Sciences, University of Notre Dame, USA.

8. Earth and Environmental Sciences, University of Technology Queensland, Australia.

9. EPOC, UMR CNRS 5805, University of Bordeaux, France.

10. Scripps Institution of Oceanography, University of California, USA.

11. Department of Geology, Northern Illinois University, USA.

12. School of Earth and Environmental Sciences, Hostos Community College (CUNY), USA.

13. Geosciences, Alfred-Wegener-Institut for Polar and Marine Research, Germany.

14. Second Institute of Oceanography, Key Laboratory of Submarine Science, China.

15. Woods Hole Oceanographic Institution, Woods Hole, USA.

16. Institute of Biogeosciences, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Japan.

17. Geologisches Institut, Universität Kõln, Germany.

18. Institute of Earth Sciences, University of Heidelberg, Germany.

19. Research Institute for Marine Geodynamics, Japan Agency for Marine–Earth Science and Technology, Japan.

20. National Centre for Polar and Ocean Research, Ministry of Earth Sciences, Goa, India.

21. Institute for Geosciences, Universidade Federal Fluminense (UFF), Brazil.

22. Graduate School of Oceanography, University of Rhode Island, USA.

23. LawrenceLivermore National Laboratory, USA.

24. NORCE, Bergen, Norway.

25. School of Earth and Environmental Sciences, Cardiff University, UK.

26. Institute for Space-Earth Environmental Research, Nagoya University, Japan.

27. School of Ecology and Environmental Science, Yunnan University, China.

Abstract

Prior to ~1 million years ago (Ma), variations in global ice volume were dominated by changes in obliquity; however, the role of precession remains unresolved. Using a record of North Atlantic ice rafting spanning the past 1.7 million years, we find that the onset of ice rafting within a given glacial cycle (reflecting ice sheet expansion) consistently occurred during times of decreasing obliquity whereas mass ice wasting (ablation) events were consistently tied to minima in precession. Furthermore, our results suggest that the ubiquitous association between precession-driven mass wasting events and glacial termination is a distinct feature of the mid to late Pleistocene. Before then (increasing), obliquity alone was sufficient to end a glacial cycle, before losing its dominant grip on deglaciation with the southward extension of Northern Hemisphere ice sheets since ~1 Ma.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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