Prof Christopher Ramsey: Publications

High-precision dating and correlation of ice, marine and terrestrial sequences spanning Heinrich Event 3: Testing mechanisms of interhemispheric change using New Zealand ancient kauri (Agathis australis)

Quaternary Science Reviews Elsevier BV 137 (2016) 126-134

Authors:

Chris SM Turney, Jonathan Palmer, Christopher Bronk Ramsey, Florian Adolphi, Raimund Muscheler, Konrad A Hughen, Richard A Staff, Richard T Jones, Zoë A Thomas, Christopher J Fogwill, Alan Hogg

Multidecadal variations in Southern Hemisphere atmospheric ¹⁴C: Evidence against a Southern Ocean sink at the end of the Little Ice Age CO₂ anomaly

Global Biogeochemical Cycles American Geophysical Union (AGU) 30:2 (2016) 211-218

Authors:

Chris SM Turney, Jonathan Palmer, Alan Hogg, Christopher J Fogwill, Richard T Jones, Christopher Bronk Ramsey, Pavla Fenwick, Pauline Grierson, Janet Wilmshurst, Alison O'Donnell, Zoë A Thomas, Mathew Lipson

Abstract:

AbstractNorthern Hemisphere‐wide cooling during the Little Ice Age (LIA; 1650–1775 Common Era, C.E.) was associated with a ~5 ppmv decrease in atmospheric carbon dioxide. Changes in terrestrial and ocean carbon reservoirs have been postulated as possible drivers of this relatively large shift in atmospheric CO2, potentially providing insights into the mechanisms and sensitivity of the global carbon cycle. Here we report decadally resolved radiocarbon (14C) levels in a network of tree‐ring series spanning 1700–1950 C.E. located along the northern boundary of, and within, the Southern Ocean. We observe regional dilutions in atmospheric radiocarbon (relative to the Northern Hemisphere) associated with upwelling of 14CO2‐depleted abyssal waters. We find the interhemispheric 14C offset approaches zero during increasing global atmospheric CO2 at the end of the LIA, with reduced ventilation in the Southern Ocean and a Northern Hemisphere source of old carbon (most probably originating from deep Arctic peat layers). The coincidence of the atmospheric CO2 increase and reduction in the interhemispheric 14C offset imply a common climate control. Possible mechanisms of synchronous change in the high latitudes of both hemispheres are discussed.

Indications of a pan-hemispheric bi-partition of the Younger Dryas Stadial from Lake Suigetsu, Japan

18 (2016) 9552

Authors:

G Schlolaut, A Brauer, T Nakagawa, H Lamb, M Marshall, M Kato-Saito, R Staff, C Bronk Ramsey, C Bryant

The Mesolithic of the wetland/dryland edge in the Somerset levels: radiocarbon dating

(2016)

Authors:

P Marshall, CB Ramsey, E Dunbar, P Reimer

Refining the Chronology of the Neolithic Settlement at Pool, Sanday, Orkney: Implications for the Emergence and Development of Grooved Ware

Proceedings of the Prehistoric Society Cambridge University Press (CUP) 81 (2015) 283-310

Authors:

Ann Macsween, John Hunter, Alison Sheridan, Julie Bond, Christopher Bronk Ramsey, Paula Reimer, Alex Bayliss, Seren Griffiths, Alasdair Whittle

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