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Radiocarbon wiggle matching of Swedish lake varves reveals asynchronous climate changes around the 8.2 kyr cold event

Snowball, Ian LU ; Muscheler, Raimund LU ; Zillén, Lovisa LU ; Sandgren, Per LU ; Stanton, Tania LU and Ljung, Karl LU (2010) In Boreas 39(4). p.720-733
Abstract
A series of nine radiocarbon measurements obtained at increments of 50 years was used to wiggle match varved sediments in Lake Kalksjon (west central Sweden) to the calendar year time scale provided by the tree-ring-derived radiocarbon calibration curve. The anchor point for a series of 400 varves known to span the '8.2 kyr cold event' was derived from a combination of correlation analysis, Monte Carlo statistics and Bayesian age modelling. The GRIP and NorthGRIP ice-cores were matched to the same absolute time scale by comparing Be-10 data and tree-ring Delta C-14. The radiocarbon-based wiggle match, organic carbon measurements, mineral magnetic parameters and XRF data reconstruct a distinct period of enhanced erosion in Kalksjon's... (More)
A series of nine radiocarbon measurements obtained at increments of 50 years was used to wiggle match varved sediments in Lake Kalksjon (west central Sweden) to the calendar year time scale provided by the tree-ring-derived radiocarbon calibration curve. The anchor point for a series of 400 varves known to span the '8.2 kyr cold event' was derived from a combination of correlation analysis, Monte Carlo statistics and Bayesian age modelling. The GRIP and NorthGRIP ice-cores were matched to the same absolute time scale by comparing Be-10 data and tree-ring Delta C-14. The radiocarbon-based wiggle match, organic carbon measurements, mineral magnetic parameters and XRF data reconstruct a distinct period of enhanced erosion in Kalksjon's catchment between 8066+/-25 and 7920+/-25 cal. yr BP. Prior to human impact, the increased erosion in the boreal environment is assigned to increased winter precipitation in the form of snow, which caused spring meltwater discharge to intensify. Our results suggest that the abrupt onset of increased winter precipitation in west central Sweden started at least 50 years after the onset of the '8.2 kyr cold event' as defined by oxygen isotope data from Greenland. The study highlights the value of synchronized time scales in the reconstruction of abrupt climate changes based on proxy data. (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
8.2 kyr cold event, climate change, radiocarbon wiggle matching, Holocene, varves
in
Boreas
volume
39
issue
4
pages
720 - 733
publisher
Taylor & Francis
external identifiers
  • wos:000282223100006
  • scopus:78649562508
ISSN
1502-3885
DOI
10.1111/j.1502-3885.2010.00167.x
project
MERGE
language
English
LU publication?
yes
id
f43f1395-4877-44ed-9587-7f4a4e9173c3 (old id 1815048)
date added to LUP
2011-03-03 09:16:21
date last changed
2018-05-29 11:54:29
@article{f43f1395-4877-44ed-9587-7f4a4e9173c3,
  abstract     = {A series of nine radiocarbon measurements obtained at increments of 50 years was used to wiggle match varved sediments in Lake Kalksjon (west central Sweden) to the calendar year time scale provided by the tree-ring-derived radiocarbon calibration curve. The anchor point for a series of 400 varves known to span the '8.2 kyr cold event' was derived from a combination of correlation analysis, Monte Carlo statistics and Bayesian age modelling. The GRIP and NorthGRIP ice-cores were matched to the same absolute time scale by comparing Be-10 data and tree-ring Delta C-14. The radiocarbon-based wiggle match, organic carbon measurements, mineral magnetic parameters and XRF data reconstruct a distinct period of enhanced erosion in Kalksjon's catchment between 8066+/-25 and 7920+/-25 cal. yr BP. Prior to human impact, the increased erosion in the boreal environment is assigned to increased winter precipitation in the form of snow, which caused spring meltwater discharge to intensify. Our results suggest that the abrupt onset of increased winter precipitation in west central Sweden started at least 50 years after the onset of the '8.2 kyr cold event' as defined by oxygen isotope data from Greenland. The study highlights the value of synchronized time scales in the reconstruction of abrupt climate changes based on proxy data.},
  author       = {Snowball, Ian and Muscheler, Raimund and Zillén, Lovisa and Sandgren, Per and Stanton, Tania and Ljung, Karl},
  issn         = {1502-3885},
  keyword      = {8.2 kyr cold event,climate change,radiocarbon wiggle matching,Holocene,varves},
  language     = {eng},
  number       = {4},
  pages        = {720--733},
  publisher    = {Taylor & Francis},
  series       = {Boreas},
  title        = {Radiocarbon wiggle matching of Swedish lake varves reveals asynchronous climate changes around the 8.2 kyr cold event},
  url          = {http://dx.doi.org/10.1111/j.1502-3885.2010.00167.x},
  volume       = {39},
  year         = {2010},
}