Advanced

Challenges in C-14 dating towards the limit of the method inferred from anchoring a floating tree ring radiocarbon chronology to ice core records around the Laschamp geomagnetic field minimum

Muscheler, Raimund LU ; Adolphi, Florian LU and Svensson, Anders (2014) In Earth and Planetary Science Letters 394. p.209-215
Abstract
The C-14 dating method is the cornerstone for inferring age estimates for natural archives covering the last 50 000 yrs. However, C-14 age calibration for the last ice age relies mostly on records that only indirectly reflect the atmospheric C-14 concentrations. In consequence, calendar age estimates are significantly more uncertain for the period of the last ice age compared to the past 14000 yrs where tree-ring based calibration records exist. Here we connect a C-14 tree-ring chronology from Kauri trees in New Zealand to ice core Be-10 records via the common signal in the galactic cosmic ray flux around the period of the Laschamp geomagnetic field minimum (ca. 41 000 yrs BP). Synchronous changes of modelled C-14 and C-14 inferred from... (More)
The C-14 dating method is the cornerstone for inferring age estimates for natural archives covering the last 50 000 yrs. However, C-14 age calibration for the last ice age relies mostly on records that only indirectly reflect the atmospheric C-14 concentrations. In consequence, calendar age estimates are significantly more uncertain for the period of the last ice age compared to the past 14000 yrs where tree-ring based calibration records exist. Here we connect a C-14 tree-ring chronology from Kauri trees in New Zealand to ice core Be-10 records via the common signal in the galactic cosmic ray flux around the period of the Laschamp geomagnetic field minimum (ca. 41 000 yrs BP). Synchronous changes of modelled C-14 and C-14 inferred from U/Th-dated speleothems support the ice core chronology independently and suggest that the published ice core time scale errors are rather conservative for this period. Our analysis puts C-14 age determinations directly into the context of ice core climate records and it shows that the C-14 records underlying the C-14 calibration curve overestimate the atmospheric C-14 concentration by more than 200 parts per thousand. Consequently, C-14 age calibration presently yields too old calendar age estimates by about 1200 yrs for this period. (C) 2014 Elsevier B.V. All rights reserved. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
C-14 calibration, Be-10, Laschamp event, cosmic rays, cosmogenic, radionuclides, chronology
in
Earth and Planetary Science Letters
volume
394
pages
209 - 215
publisher
Elsevier
external identifiers
  • wos:000335613300021
  • scopus:84897538354
ISSN
1385-013X
DOI
10.1016/j.epsl.2014.03.024
project
MERGE
language
English
LU publication?
yes
id
cef58de2-c559-44a7-b202-cdf127bd2668 (old id 4470537)
date added to LUP
2014-06-19 12:44:12
date last changed
2017-07-23 03:05:20
@article{cef58de2-c559-44a7-b202-cdf127bd2668,
  abstract     = {The C-14 dating method is the cornerstone for inferring age estimates for natural archives covering the last 50 000 yrs. However, C-14 age calibration for the last ice age relies mostly on records that only indirectly reflect the atmospheric C-14 concentrations. In consequence, calendar age estimates are significantly more uncertain for the period of the last ice age compared to the past 14000 yrs where tree-ring based calibration records exist. Here we connect a C-14 tree-ring chronology from Kauri trees in New Zealand to ice core Be-10 records via the common signal in the galactic cosmic ray flux around the period of the Laschamp geomagnetic field minimum (ca. 41 000 yrs BP). Synchronous changes of modelled C-14 and C-14 inferred from U/Th-dated speleothems support the ice core chronology independently and suggest that the published ice core time scale errors are rather conservative for this period. Our analysis puts C-14 age determinations directly into the context of ice core climate records and it shows that the C-14 records underlying the C-14 calibration curve overestimate the atmospheric C-14 concentration by more than 200 parts per thousand. Consequently, C-14 age calibration presently yields too old calendar age estimates by about 1200 yrs for this period. (C) 2014 Elsevier B.V. All rights reserved.},
  author       = {Muscheler, Raimund and Adolphi, Florian and Svensson, Anders},
  issn         = {1385-013X},
  keyword      = {C-14 calibration,Be-10,Laschamp event,cosmic rays,cosmogenic,radionuclides,chronology},
  language     = {eng},
  pages        = {209--215},
  publisher    = {Elsevier},
  series       = {Earth and Planetary Science Letters},
  title        = {Challenges in C-14 dating towards the limit of the method inferred from anchoring a floating tree ring radiocarbon chronology to ice core records around the Laschamp geomagnetic field minimum},
  url          = {http://dx.doi.org/10.1016/j.epsl.2014.03.024},
  volume       = {394},
  year         = {2014},
}