Marine20—The Marine Radiocarbon Age Calibration Curve (0–55,000 cal BP)

作者：Timothy Heaton, Peter Köhler, Martin Butzin, Édouard Bard, Ron Reimer, William E. N. Austin, Christopher Bronk Ramsey, Pieter Meiert Grootes, Konrad A Hughen, Bernd Kromer, Paula Reimer, Jess F. Adkins, Andrea Burke, M. S. Cook, Jesper Olsen, Luke C Skinner · 发表于：Radiocarbon · 年份：2020 · DOI：10.1017/rdc.2020.68 · 被引用次数：1952 · 研究领域：Geology and Paleoclimatology Research、Isotope Analysis in Ecology、Archaeology and ancient environmental studies

ABSTRACT The concentration of radiocarbon ( 14 C) differs between ocean and atmosphere. Radiocarbon determinations from samples which obtained their 14 C 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 14 C curve and reconstructed changes in CO 2 obtained from ice core data. These forcings enable us to incorporate carbon cycle dynamics and temporal changes in the atmospheric 14 C 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...