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Synchronizing the Western Gotland Basin (Baltic Sea) and Lake Kälksjön (central Sweden) sediment records using common cosmogenic radionuclide production variations

Czymzik, Markus LU ; Christl, Marcus ; Dellwig, Olaf ; Muscheler, Raimund LU orcid ; Müller, Daniela ; Kaiser, Jérôme ; Schwab, Markus J. ; Nantke, Carla K.M. ; Brauer, Achim and Arz, Helge W. (2024) In Holocene
Abstract

Multi-archive studies of climate events and archive-specific response times require synchronous time scales. Aligning common variations in the cosmogenic radionuclide production rate via curve fitting methods provides a tool for the continuous synchronization of natural environmental archives down to decadal precision. Based on this approach, we synchronize 10Be records from Western Gotland Basin (WGB, Baltic Sea) and Lake Kälksjön (KKJ, central Sweden) sediments to the 14C production time series from the IntCal20 calibration curve during the Mid-Holocene period ~6400 to 5200 a BP. Before the synchronization, we assess and reduce non-production variability in the 10Be records by using... (More)

Multi-archive studies of climate events and archive-specific response times require synchronous time scales. Aligning common variations in the cosmogenic radionuclide production rate via curve fitting methods provides a tool for the continuous synchronization of natural environmental archives down to decadal precision. Based on this approach, we synchronize 10Be records from Western Gotland Basin (WGB, Baltic Sea) and Lake Kälksjön (KKJ, central Sweden) sediments to the 14C production time series from the IntCal20 calibration curve during the Mid-Holocene period ~6400 to 5200 a BP. Before the synchronization, we assess and reduce non-production variability in the 10Be records by using 10Be/9Be ratios and removing common variability with the TOC record from KKJ sediments based on regression analysis. The synchronizations to the IntCal20 14C production time scale suggest decadal to multi-decadal refinements of the WGB and KKJ chronologies. These refinements reduce the previously centennial chronological uncertainties of both archives to about ± 20 (WGB) and ±40 (KKJ) years. Combining proxy time series from the synchronized archives enables us to interpret a period of ventilation in the deep central Baltic Sea basins from ~6250 to 6000 a BP as possibly caused by inter-annual cooling reducing vertical water temperature gradients allowing deep water formation during exceptionally cold winters.

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author
; ; ; ; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
in press
subject
keywords
Be, chronology, Mid-Holocene climate, sediment archives, time scale synchronization, western Baltic region
in
Holocene
publisher
SAGE Publications
external identifiers
  • scopus:85191287681
ISSN
0959-6836
DOI
10.1177/09596836241247311
language
English
LU publication?
yes
id
30cd2134-cbd7-4064-a2b5-b0c94b91c981
date added to LUP
2024-05-06 11:11:16
date last changed
2024-05-06 11:11:59
@article{30cd2134-cbd7-4064-a2b5-b0c94b91c981,
  abstract     = {{<p>Multi-archive studies of climate events and archive-specific response times require synchronous time scales. Aligning common variations in the cosmogenic radionuclide production rate via curve fitting methods provides a tool for the continuous synchronization of natural environmental archives down to decadal precision. Based on this approach, we synchronize <sup>10</sup>Be records from Western Gotland Basin (WGB, Baltic Sea) and Lake Kälksjön (KKJ, central Sweden) sediments to the <sup>14</sup>C production time series from the IntCal20 calibration curve during the Mid-Holocene period ~6400 to 5200 a BP. Before the synchronization, we assess and reduce non-production variability in the <sup>10</sup>Be records by using <sup>10</sup>Be/<sup>9</sup>Be ratios and removing common variability with the TOC record from KKJ sediments based on regression analysis. The synchronizations to the IntCal20 <sup>14</sup>C production time scale suggest decadal to multi-decadal refinements of the WGB and KKJ chronologies. These refinements reduce the previously centennial chronological uncertainties of both archives to about ± 20 (WGB) and ±40 (KKJ) years. Combining proxy time series from the synchronized archives enables us to interpret a period of ventilation in the deep central Baltic Sea basins from ~6250 to 6000 a BP as possibly caused by inter-annual cooling reducing vertical water temperature gradients allowing deep water formation during exceptionally cold winters.</p>}},
  author       = {{Czymzik, Markus and Christl, Marcus and Dellwig, Olaf and Muscheler, Raimund and Müller, Daniela and Kaiser, Jérôme and Schwab, Markus J. and Nantke, Carla K.M. and Brauer, Achim and Arz, Helge W.}},
  issn         = {{0959-6836}},
  keywords     = {{Be; chronology; Mid-Holocene climate; sediment archives; time scale synchronization; western Baltic region}},
  language     = {{eng}},
  publisher    = {{SAGE Publications}},
  series       = {{Holocene}},
  title        = {{Synchronizing the Western Gotland Basin (Baltic Sea) and Lake Kälksjön (central Sweden) sediment records using common cosmogenic radionuclide production variations}},
  url          = {{http://dx.doi.org/10.1177/09596836241247311}},
  doi          = {{10.1177/09596836241247311}},
  year         = {{2024}},
}