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- W107919892 abstract "Introduction The reconstruction of long-term climate variations and accurate estimation of temperature amplitude remain major challenges of contemporary palaeoclimatology (Cook et al. 1995, Esper et al. 2005). One of the key methods to address these issues is the Regional Curve Standardisation (RCS, Esper et al. 2003) that has meanwhile successfully been applied to a variety of tree-ring datasets (e.g., Briffa 2000, Buntgen et al. 2005, 2006, 2008, Cook et al. 2002, Esper et al. 2002, Frank et al. 2007, Luckman & Wilson 2005, Naurzbaev et al. 2002), and is considered the standard method for regional tree-ring based temperature reconstructions in the recent IPCC report (IPCC 2007, see also Esper & Frank 2008). A potential limitation of this method, however, seemed to be a lack of information on innermost tree-rings, the so-called offset (PO), defined as the number of (missing) years between the innermost ring on a core sample and the pith of the stem in breast height. Missing PO information typical for dendrochronological datasets -is relevant to RCS, as it affects the alignment of treering data by cambial age, and thus the course and position of the regional curve used for detrending of all measurement series (details in Esper et al. 2003). The influence of PO on chronology trend has been addressed for so-called composite datasets integrating samples from living trees and relict material (Esper et al. 2003), but remained unclear for RCS detrended chronologies from only living trees. Such chronologies have, however, recently been produced for Central Asia, North Africa, and the high northern latitudes (e.g., Briffa et al. 2001, Esper et al. 2007a, 2007b), for example. RCS detrended timeseries from only living trees might particularly be prone to trend biases, as PO is not distributed over much of the chronology period -such as is the case for well-replicated composite chronologies -but is concentrated to the beginning of the timeseries. We here analyse these potential biases and test the influence of PO on chronology trend using a large collection of tree-ring width (TRW) and maximum density data (MXD) from living larch and pine trees in Western and Central Siberia. PO data were estimated by WSL and Sukachev Forest Institute staff considering the curvature and size of innermost rings on core samples, diameter of the stem, and information from other cores of the same tree if available. We analyse the age-trend of TRW and MXD data and show how PO is increased and concentrated towards the beginning of the dataset. The influence of PO on chronology trend is analysed using residual timeseries derived from RCS detrended TRW and MXD chronologies that do and do not include PO information. Results are briefly discussed with respect to their relevance for long-term climate reconstruction." @default.
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- W107919892 date "2009-01-01" @default.
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- W107919892 title "Influence of pith offset on tree-ring chronology trend" @default.
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