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A comparison between Tree-Ring Width and Blue Intensity high and low frequency signals from Pinus sylvestris L. from the Central and Northern Scandinavian Mountains

Conference contribution
Authors Mauricio Fuentes
Hans W. Linderholm
Kristina Seftigen
Jesper Björklund
Björn E Gunnarson
Juan Aravena
Published in TRACE - Tree Rings in Archaeology, Climatolog y and Ecology, Volume 14. Scien tific Technical Report 16/04, GFZ German Research Centre for Geosciences, p. 38-43. doi: 10.2312/GFZ.b103-16042.
Volume 14
Pages 38-43
Publication year 2016
Published at Department of Earth Sciences
Pages 38-43
Language en
Links treering.de/sites/default/files/TRA...
Subject categories Earth and Related Environmental Sciences

Abstract

During the last decades, dendroclimatological methods have been used to produce several climate reconstructions, where chronologies based on maximum latewood d ensity (MXD) data (e.g.,Briffa et al. 2002, Gunnarson et al. 2011, Esper et al. 2012) have pro vided estimates of past temperature variability. Despite an often superior signal strength of the M XD parameter compared to tree ring width (RW) (e.g., Briffa et al. 2002), very few laboratories in the world use this technique, mainly because this proxy is expensive and labour intensive to produce . As an alternative, blue intensity (BI) utilizing reflected/absorbed blue light from scanned sampl e-images of tree rings, is explored as a surrogate to radio densitometry (McCarroll et al. 2002, Campb ell et al. 2011, Björklund et al. 2014, Rydval et al. 2014). However, BI seems more susceptible t o biases caused by the transition between the heartwood and the sapwood, but also by the mixing o f modern wood and deadwood (Björklund et al. 2014). This has according to Rydval et al. (2 014) and Wilson et al. (2014) restricted the application of the, to the MXD analogue, MXBI pa rameter (Björklund et al. 2014) to frequencies higher than 20 years. To overcome this bias, Björkl und et al. (2014, 2015) suggested the use of a new variant of BI parameter: the adjusted Δblue in tensity (ΔBI adj ), which is derived by subtracting the BI in the earlywood from the MXBI, after sample s have been contrast adjusted, based on their general level of staining (Björklund et al. 2015 ). Few comparisons between RW and MXD have been made (e.g., Briffa et al. 2002, Franke et al. 201 3), and even fewer comparisons between MXBI and RW have been made (Wilson et al. 2014). The ai m of this study is to assess the similarities and differences in temperature sensitive Pinus sylvestris L. RW and ΔBI adj j chronologies sampled across three sites in Sweden, by exploring 1) the climate correlation and spectral characteristics of the different parameters, 2) the in ter correlation and frequency association between them.

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