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Testing and Improving the IntCal20 Calibration Curve with Independent Records

Muscheler, Raimund LU ; Adolphi, Florian LU ; Heaton, Timothy J. ; Bronk Ramsey, Christopher ; Svensson, Anders ; Van Der Plicht, Johannes and Reimer, Paula J. (2020) In Radiocarbon 62(4). p.1079-1094
Abstract

Connecting calendar ages to radiocarbon (C) ages, i.e. constructing a calibration curve, requires C samples that represent, or are closely connected to, atmospheric C values and that can also be independently dated. In addition to these data, there is information that can serve as independent tests of the calibration curve. For example, information from ice core radionuclide data cannot be directly incorporated into the calibration curve construction as it delivers less direct information on the C age-calendar age relationship but it can provide tests of the quality of the calibration curve. Furthermore, ice core ages on C-dated volcanic eruptions provide key information on the agreement of ice core and radiocarbon time scales. Due to... (More)

Connecting calendar ages to radiocarbon (C) ages, i.e. constructing a calibration curve, requires C samples that represent, or are closely connected to, atmospheric C values and that can also be independently dated. In addition to these data, there is information that can serve as independent tests of the calibration curve. For example, information from ice core radionuclide data cannot be directly incorporated into the calibration curve construction as it delivers less direct information on the C age-calendar age relationship but it can provide tests of the quality of the calibration curve. Furthermore, ice core ages on C-dated volcanic eruptions provide key information on the agreement of ice core and radiocarbon time scales. Due to their scarcity such data would have little impact if directly incorporated into the calibration curve. However, these serve as important anchor points in time for independently testing the calibration curve and/or ice-core time scales. Here we will show that such information largely supports the new IntCal20 calibration record. Furthermore, we discuss how floating tree-ring sequences on ice-core time scales agree with the new calibration curve. For the period around 40,000 years ago we discuss unresolved differences between ice core Be and C records that are possibly related to our limited understanding of carbon cycle influences on the atmospheric C concentration during the last glacial period. Finally, we review the results on the time scale comparison between the Greenland ice-core time scale (GICC05) and IntCal20 that effectively allow a direct comparison of C-dated records with the Greenland ice core data.

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author
; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
calibration, chronology, climate, dating, ice core
in
Radiocarbon
volume
62
issue
4
pages
16 pages
publisher
Arizona Board of Regents (University of Arizona)
external identifiers
  • scopus:85092365813
ISSN
0033-8222
DOI
10.1017/RDC.2020.54
language
English
LU publication?
yes
id
a744e8fb-9470-4da2-8fee-591fee5d1b58
date added to LUP
2020-11-04 07:35:38
date last changed
2020-12-29 04:02:39
@article{a744e8fb-9470-4da2-8fee-591fee5d1b58,
  abstract     = {<p>Connecting calendar ages to radiocarbon (C) ages, i.e. constructing a calibration curve, requires C samples that represent, or are closely connected to, atmospheric C values and that can also be independently dated. In addition to these data, there is information that can serve as independent tests of the calibration curve. For example, information from ice core radionuclide data cannot be directly incorporated into the calibration curve construction as it delivers less direct information on the C age-calendar age relationship but it can provide tests of the quality of the calibration curve. Furthermore, ice core ages on C-dated volcanic eruptions provide key information on the agreement of ice core and radiocarbon time scales. Due to their scarcity such data would have little impact if directly incorporated into the calibration curve. However, these serve as important anchor points in time for independently testing the calibration curve and/or ice-core time scales. Here we will show that such information largely supports the new IntCal20 calibration record. Furthermore, we discuss how floating tree-ring sequences on ice-core time scales agree with the new calibration curve. For the period around 40,000 years ago we discuss unresolved differences between ice core Be and C records that are possibly related to our limited understanding of carbon cycle influences on the atmospheric C concentration during the last glacial period. Finally, we review the results on the time scale comparison between the Greenland ice-core time scale (GICC05) and IntCal20 that effectively allow a direct comparison of C-dated records with the Greenland ice core data. </p>},
  author       = {Muscheler, Raimund and Adolphi, Florian and Heaton, Timothy J. and Bronk Ramsey, Christopher and Svensson, Anders and Van Der Plicht, Johannes and Reimer, Paula J.},
  issn         = {0033-8222},
  language     = {eng},
  number       = {4},
  pages        = {1079--1094},
  publisher    = {Arizona Board of Regents (University of Arizona)},
  series       = {Radiocarbon},
  title        = {Testing and Improving the IntCal20 Calibration Curve with Independent Records},
  url          = {http://dx.doi.org/10.1017/RDC.2020.54},
  doi          = {10.1017/RDC.2020.54},
  volume       = {62},
  year         = {2020},
}