Colonization of the Americas, ‘Little Ice Age’ climate, and bomb-produced carbon: Their role in defining the Anthropocene

Author:

,Zalasiewicz Jan1,Waters Colin N2,Barnosky Anthony D3,Cearreta Alejandro4,Edgeworth Matt1,Ellis Erle C5,Gałuszka Agnieszka6,Gibbard Philip L7,Grinevald Jacques8,Hajdas Irka9,Ivar do Sul Juliana10,Jeandel Catherine11,Leinfelder Reinhold12,McNeill JR13,Poirier Clément14,Revkin Andrew15,deB Richter Daniel16,Steffen Will17,Summerhayes Colin18,Syvitski James PM19,Vidas Davor20,Wagreich Michael21,Williams Mark1,Wolfe Alexander P22

Affiliation:

1. University of Leicester, UK

2. British Geological Survey, UK

3. University of California, USA

4. Universidad del País Vasco UPV/EHU, Spain

5. University of Maryland, Baltimore County, USA

6. Jan Kochanowski University, Poland

7. University of Cambridge, UK

8. IHEID, Switzerland

9. ETH Zurich, Laboratory of Ion Beam Physics, Switzerland

10. Association of Polar Early Career Scientists, Brazil

11. LEGOS (Université Paul Sabatier, CNRS/CNES/IRD), Toulouse, France

12. Freie Universität Berlin, Germany

13. Georgetown University, USA

14. Université de Caen Basse Normandie, CNRS, France

15. Pace Academy for Advanced Environmental Studies, USA

16. Duke University, USA

17. The Australian National University, Canberra, Australia

18. Scott Polar Research Institute, Cambridge University, UK

19. University of Colorado-Boulder Campus, USA

20. The Fridtjof Nansen Institute, Norway

21. University of Vienna, Austria

22. University of Alberta, Canada

Abstract

A recently published analysis by Lewis and Maslin (Lewis SL and Maslin MA (2015) Defining the Anthropocene. Nature 519: 171–180) has identified two new potential horizons for the Holocene−Anthropocene boundary: 1610 (associated with European colonization of the Americas), or 1964 (the peak of the excess radiocarbon signal arising from atom bomb tests). We discuss both of these novel suggestions, and consider that there is insufficient stratigraphic basis for the former, whereas placing the latter at the peak of the signal rather than at its inception does not follow normal stratigraphical practice. Wherever the boundary is eventually placed, it should be optimized to reflect stratigraphical evidence with the least possible ambiguity.

Publisher

SAGE Publications

Subject

Geology,Ecology,Global and Planetary Change

Reference51 articles.

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