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Periodicities in mid- to late-Holocene peatland hydrology identified from Swedish and Lithuanian tree-ring data

Journal article
Authors Johannes Edvardsson
Florian Adolphi
Hans W. Linderholm
Christophe Corona
Raimund Muscheler
Markus Stoffel
Published in Quaternary Science Reviews
Volume 137
Pages 200-208
ISSN 0277-3791
Publication year 2016
Published at Department of Earth Sciences
Pages 200-208
Language en
Links dx.doi.org/10.1016/j.quascirev.2016...
Keywords Wavelet analysis, Spectral analysis, NAO, AMO, Solar variability, Lunar nodal tides, Sweden, Lithuania
Subject categories Climate Research

Abstract

Twenty-five tree-ring width (TRW) chronologies, developed from moisture sensitive peatland trees in Sweden and Lithuania, and representing eight periods during the mid-Holocene to present, were analysed regarding common periodicities (cycles). Periods of 13e15, 20e22, and 30e35 years were found in most chronologies, while 8e10, 18e19, and 60e65 year periodicities were observed as well, but less commonly. Similar periodicities, especially about 15 and 30 years in duration, were detected in both living and subfossil trees, indicating that the trees have responded to similar forcing mechanisms on those timescales through time. Some of the detected periods may be related to solar variability and lunar nodal tides, but most of the detected periodicities are more likely linked to hydrological changes in the peatlands associated to atmospheric patterns such as the North Atlantic Oscillation (NAO), or variations in sea surface temperatures (i.e. the Atlantic Multidecadal Oscillation, AMO). However, no significant relationships between tree growth, NAO and AMO could be formally established, possibly due to hydrological lag and feedback effects which are typical for peatlands but render in-depth assessments rather difficult.

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