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Assessing non-linearity in European temperature-sensitive tree-ring data

Journal article
Authors Fredrik Charpentier Ljungqvist
Peter Thejll
Jesper Björklund
Björn E. Gunnarson
Alma Piermattei
Miloš Rydval
Kristina Seftigen
Bård Støve
Ulf Büntgen
Published in Dendrochronologia
Volume 59
ISSN 11257865
Publication year 2020
Published at Department of Earth Sciences
Language en
Keywords Calibration methods, Dendroclimatology, Non-linearities, Tree-ring maximum blue intensity, Tree-ring maximum density, Tree-ring width
Subject categories Earth and Related Environmental Sciences

Abstract

© 2019 The Authors We test the application of parametric, non-parametric, and semi-parametric calibration models for reconstructing summer (June–August) temperature from a set of tree-ring width and density data on the same dendro samples from 40 sites across Europe. By comparing the performance of the three calibration models on öpairs” of tree-ring width (TRW) and maximum density (MXD) or maximum blue intensity (MXBI), we test whether a non-linear temperature response is more prevalent in TRW or MXD (MXBI) data, and whether it is associated with the temperature sensitivity and/or autocorrelation structure of the dendro parameters. We note that MXD (MXBI) data have a significantly stronger temperature response than TRW data as well as a lower autocorrelation that is more similar to that of the instrumental temperature data, whereas TRW exhibits a öredder” variability continuum. This study shows that the use of non-parametric calibration models is more suitable for TRW data, while parametric calibration is sufficient for both MXD and MXBI data – that is, we show that TRW is by far the more non-linear proxy.

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