TY - JOUR
T1 - An automated method for varve interpolation and its application to the Late Glacial chronology from Lake Suigetsu, Japan
AU - Suigetsu 2006 Project Members
AU - Schlolaut, Gordon
AU - Marshall, Michael H.
AU - Brauer, Achim
AU - Nakagawa, Takeshi
AU - Lamb, Henry F.
AU - Staff, Richard A.
AU - Bronk Ramsey, Christopher
AU - Bryant, Charlotte L.
AU - Brock, Fiona
AU - Kossler, Annette
AU - Tarasov, Pavel E.
AU - Yokoyama, Yusuke
AU - Tada, Ryuji
AU - Haraguchi, Tsuyoshi
N1 - Funding Information:
We thank the German Research Foundation (DFG grants TA-540/3-1 , BR 2208/7-1 ), the UK Natural Environment Research Council (NERC grants NE/D000289/1 , NE/F003048/1 , SM/1219.0407/001 ), the KAKENHI project of Japan (grant 211001002 ) and INTIMATE EU cost for funding. Furthermore, we thank two anonymous reviewers and S. Lauterbach for their constructive and helpful suggestions on the manuscript. We also thank H. Kitagawa and J. van der Plicht for inspiration for the project.
PY - 2012/12/1
Y1 - 2012/12/1
N2 - The Lake Suigetsu sediment has been recognised for its potential to create a wholly terrestrial (i.e. non-reservoir-corrected) 14C calibration dataset, as it exhibits annual laminations (varves) for much of its depth and is rich in terrestrial leaf fossils, providing a record of atmospheric radiocarbon. Microscopic analysis revealed that the varve record is curtailed due to the incomplete formation or preservation of annual laminae, necessitating interpolation. The program for varve interpolation presented here analyses the seasonal layer distribution and automatically derives a sedimentation rate estimate, which is the basis for interpolation, and applies it to complement the original varve count. As the interpolation is automated it largely avoids subjectivity, which manual interpolation approaches often suffer from. Application to the Late Glacial chronology from Lake Suigetsu demonstrates the implementation and the limits of the method. To evaluate the reliability of the technique, the interpolation result is compared with the 14C chronology from Lake Suigetsu, calibrated with the tree-ring derived section of the IntCal09 calibration curve. The comparison shows that the accuracy of the interpolation result is well within the 68.2% probability range of the calibrated 14C dates and that it is therefore suitable for calibration beyond the present tree-ring limit.
AB - The Lake Suigetsu sediment has been recognised for its potential to create a wholly terrestrial (i.e. non-reservoir-corrected) 14C calibration dataset, as it exhibits annual laminations (varves) for much of its depth and is rich in terrestrial leaf fossils, providing a record of atmospheric radiocarbon. Microscopic analysis revealed that the varve record is curtailed due to the incomplete formation or preservation of annual laminae, necessitating interpolation. The program for varve interpolation presented here analyses the seasonal layer distribution and automatically derives a sedimentation rate estimate, which is the basis for interpolation, and applies it to complement the original varve count. As the interpolation is automated it largely avoids subjectivity, which manual interpolation approaches often suffer from. Application to the Late Glacial chronology from Lake Suigetsu demonstrates the implementation and the limits of the method. To evaluate the reliability of the technique, the interpolation result is compared with the 14C chronology from Lake Suigetsu, calibrated with the tree-ring derived section of the IntCal09 calibration curve. The comparison shows that the accuracy of the interpolation result is well within the 68.2% probability range of the calibrated 14C dates and that it is therefore suitable for calibration beyond the present tree-ring limit.
KW - C calibration
KW - Chronology
KW - Interpolation
KW - LGIT
KW - Sediment core
KW - Suigetsu
KW - Varves
UR - http://hdl.handle.net/2160/36238
UR - http://www.scopus.com/inward/record.url?scp=84868214979&partnerID=8YFLogxK
U2 - 10.1016/j.quageo.2012.07.005
DO - 10.1016/j.quageo.2012.07.005
M3 - Article
SN - 1871-1014
VL - 13
SP - 52
EP - 69
JO - Quaternary Geochronology
JF - Quaternary Geochronology
ER -