Marine20—The Marine Radiocarbon Age Calibration Curve (0–55,000 cal BP)
The concentration of radiocarbon (14C) differs between ocean and atmosphere. Radiocarbon determinations from samples which obtained their 14C in the marine environment therefore need a marine-specific calibration curve and cannot be calibrated directly against the atmospheric-based IntCal20 curve. T...
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ftucambridgeesc:oai:eprints.esc.cam.ac.uk:4916 2023-05-15T16:39:27+02:00 Marine20—The Marine Radiocarbon Age Calibration Curve (0–55,000 cal BP) Heaton, Timothy J Köhler, Peter Butzin, Martin Bard, Edouard Reimer, Ron W Austin, William E N Bronk Ramsey, Christopher Grootes, Pieter M Hughen, Konrad A Kromer, Bernd Reimer, Paula J Adkins, Jess Burke, Andrea Cook, Mea S Olsen, Jesper Skinner, Luke C. 2020 text http://eprints.esc.cam.ac.uk/4916/ http://eprints.esc.cam.ac.uk/4916/1/marine20the_marine_radiocarbon_age_calibration_curve_055000_cal_bp.pdf https://doi.org/10.1017/RDC.2020.68 en eng CUP http://eprints.esc.cam.ac.uk/4916/1/marine20the_marine_radiocarbon_age_calibration_curve_055000_cal_bp.pdf Heaton, Timothy J and Köhler, Peter and Butzin, Martin and Bard, Edouard and Reimer, Ron W and Austin, William E N and Bronk Ramsey, Christopher and Grootes, Pieter M and Hughen, Konrad A and Kromer, Bernd and Reimer, Paula J and Adkins, Jess and Burke, Andrea and Cook, Mea S and Olsen, Jesper and Skinner, Luke C. (2020) Marine20—The Marine Radiocarbon Age Calibration Curve (0–55,000 cal BP). Radiocarbon, 62 (4). pp. 779-820. ISSN 0033-8222 DOI https://doi.org/10.1017/RDC.2020.68 <https://doi.org/10.1017/RDC.2020.68> cc_by CC-BY 01 - Climate Change and Earth-Ocean Atmosphere Systems Article PeerReviewed 2020 ftucambridgeesc https://doi.org/10.1017/RDC.2020.68 2020-11-12T23:15:45Z The concentration of radiocarbon (14C) differs between ocean and atmosphere. Radiocarbon determinations from samples which obtained their 14C in the marine environment therefore need a marine-specific calibration curve and cannot be calibrated directly against the atmospheric-based IntCal20 curve. This paper presents Marine20, an update to the internationally agreed marine radiocarbon age calibration curve that provides a non-polar global-average marine record of radiocarbon from 0–55 cal kBP and serves as a baseline for regional oceanic variation. Marine20 is intended for calibration of marine radiocarbon samples from non-polar regions; it is not suitable for calibration in polar regions where variability in sea ice extent, ocean upwelling and air-sea gas exchange may have caused larger changes to concentrations of marine radiocarbon. The Marine20 curve is based upon 500 simulations with an ocean/atmosphere/biosphere box-model of the global carbon cycle that has been forced by posterior realizations of our Northern Hemispheric atmospheric IntCal20 14C curve and reconstructed changes in CO2 obtained from ice core data. These forcings enable us to incorporate carbon cycle dynamics and temporal changes in the atmospheric 14C level. The box-model simulations of the global-average marine radiocarbon reservoir age are similar to those of a more complex three-dimensional ocean general circulation model. However, simplicity and speed of the box model allow us to use a Monte Carlo approach to rigorously propagate the uncertainty in both the historic concentration of atmospheric 14C and other key parameters of the carbon cycle through to our final Marine20 calibration curve. This robust propagation of uncertainty is fundamental to providing reliable precision for the radiocarbon age calibration of marine based samples. We make a first step towards deconvolving the contributions of different processes to the total uncertainty; discuss the main differences of Marine20 from the previous age calibration curve Marine13; and identify the limitations of our approach together with key areas for further work. The updated values for ΔR, the regional marine radiocarbon reservoir age corrections required to calibrate against Marine20, can be found at the data base Article in Journal/Newspaper ice core Sea ice University of Cambridge, Department of Earth Sciences: ESC Publications Radiocarbon 62 4 779 820 |
institution |
Open Polar |
collection |
University of Cambridge, Department of Earth Sciences: ESC Publications |
op_collection_id |
ftucambridgeesc |
language |
English |
topic |
01 - Climate Change and Earth-Ocean Atmosphere Systems |
spellingShingle |
01 - Climate Change and Earth-Ocean Atmosphere Systems Heaton, Timothy J Köhler, Peter Butzin, Martin Bard, Edouard Reimer, Ron W Austin, William E N Bronk Ramsey, Christopher Grootes, Pieter M Hughen, Konrad A Kromer, Bernd Reimer, Paula J Adkins, Jess Burke, Andrea Cook, Mea S Olsen, Jesper Skinner, Luke C. Marine20—The Marine Radiocarbon Age Calibration Curve (0–55,000 cal BP) |
topic_facet |
01 - Climate Change and Earth-Ocean Atmosphere Systems |
description |
The concentration of radiocarbon (14C) differs between ocean and atmosphere. Radiocarbon determinations from samples which obtained their 14C in the marine environment therefore need a marine-specific calibration curve and cannot be calibrated directly against the atmospheric-based IntCal20 curve. This paper presents Marine20, an update to the internationally agreed marine radiocarbon age calibration curve that provides a non-polar global-average marine record of radiocarbon from 0–55 cal kBP and serves as a baseline for regional oceanic variation. Marine20 is intended for calibration of marine radiocarbon samples from non-polar regions; it is not suitable for calibration in polar regions where variability in sea ice extent, ocean upwelling and air-sea gas exchange may have caused larger changes to concentrations of marine radiocarbon. The Marine20 curve is based upon 500 simulations with an ocean/atmosphere/biosphere box-model of the global carbon cycle that has been forced by posterior realizations of our Northern Hemispheric atmospheric IntCal20 14C curve and reconstructed changes in CO2 obtained from ice core data. These forcings enable us to incorporate carbon cycle dynamics and temporal changes in the atmospheric 14C level. The box-model simulations of the global-average marine radiocarbon reservoir age are similar to those of a more complex three-dimensional ocean general circulation model. However, simplicity and speed of the box model allow us to use a Monte Carlo approach to rigorously propagate the uncertainty in both the historic concentration of atmospheric 14C and other key parameters of the carbon cycle through to our final Marine20 calibration curve. This robust propagation of uncertainty is fundamental to providing reliable precision for the radiocarbon age calibration of marine based samples. We make a first step towards deconvolving the contributions of different processes to the total uncertainty; discuss the main differences of Marine20 from the previous age calibration curve Marine13; and identify the limitations of our approach together with key areas for further work. The updated values for ΔR, the regional marine radiocarbon reservoir age corrections required to calibrate against Marine20, can be found at the data base |
format |
Article in Journal/Newspaper |
author |
Heaton, Timothy J Köhler, Peter Butzin, Martin Bard, Edouard Reimer, Ron W Austin, William E N Bronk Ramsey, Christopher Grootes, Pieter M Hughen, Konrad A Kromer, Bernd Reimer, Paula J Adkins, Jess Burke, Andrea Cook, Mea S Olsen, Jesper Skinner, Luke C. |
author_facet |
Heaton, Timothy J Köhler, Peter Butzin, Martin Bard, Edouard Reimer, Ron W Austin, William E N Bronk Ramsey, Christopher Grootes, Pieter M Hughen, Konrad A Kromer, Bernd Reimer, Paula J Adkins, Jess Burke, Andrea Cook, Mea S Olsen, Jesper Skinner, Luke C. |
author_sort |
Heaton, Timothy J |
title |
Marine20—The Marine Radiocarbon Age Calibration Curve (0–55,000 cal BP) |
title_short |
Marine20—The Marine Radiocarbon Age Calibration Curve (0–55,000 cal BP) |
title_full |
Marine20—The Marine Radiocarbon Age Calibration Curve (0–55,000 cal BP) |
title_fullStr |
Marine20—The Marine Radiocarbon Age Calibration Curve (0–55,000 cal BP) |
title_full_unstemmed |
Marine20—The Marine Radiocarbon Age Calibration Curve (0–55,000 cal BP) |
title_sort |
marine20—the marine radiocarbon age calibration curve (0–55,000 cal bp) |
publisher |
CUP |
publishDate |
2020 |
url |
http://eprints.esc.cam.ac.uk/4916/ http://eprints.esc.cam.ac.uk/4916/1/marine20the_marine_radiocarbon_age_calibration_curve_055000_cal_bp.pdf https://doi.org/10.1017/RDC.2020.68 |
genre |
ice core Sea ice |
genre_facet |
ice core Sea ice |
op_relation |
http://eprints.esc.cam.ac.uk/4916/1/marine20the_marine_radiocarbon_age_calibration_curve_055000_cal_bp.pdf Heaton, Timothy J and Köhler, Peter and Butzin, Martin and Bard, Edouard and Reimer, Ron W and Austin, William E N and Bronk Ramsey, Christopher and Grootes, Pieter M and Hughen, Konrad A and Kromer, Bernd and Reimer, Paula J and Adkins, Jess and Burke, Andrea and Cook, Mea S and Olsen, Jesper and Skinner, Luke C. (2020) Marine20—The Marine Radiocarbon Age Calibration Curve (0–55,000 cal BP). Radiocarbon, 62 (4). pp. 779-820. ISSN 0033-8222 DOI https://doi.org/10.1017/RDC.2020.68 <https://doi.org/10.1017/RDC.2020.68> |
op_rights |
cc_by |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1017/RDC.2020.68 |
container_title |
Radiocarbon |
container_volume |
62 |
container_issue |
4 |
container_start_page |
779 |
op_container_end_page |
820 |
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1766029804310626304 |