Journal of Siberian Federal University. Biology / Dendroclimatic Potential of Blue Intensity-Based Chronologies of Northern Fennoscandia Scots Pine

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Issue
Journal of Siberian Federal University. Biology. 2022 15 (2)
Authors
Vyukhina, Arina A.; Gurskaya, Marina A.
Contact information
Vyukhina, Arina A.: Institute of Plant and Animal Ecology UB RAS Ekaterinburg, Russian Federation; ORCID: 0000-0003-4420-4665; Gurskaya, Marina A.: Institute of Plant and Animal Ecology UB RAS Ekaterinburg, Russian Federation; ; ORCID: 0000-0001-5815-7228
Keywords
blue intensity; Scots pine; tree-ring width; climatic factors; climate reconstruction; Fennoscandia
Abstract

Annual rings contain information about past climate changes. A promising climate proxy is the blue intensity index (BI) obtained from digital images of tree cores. The work is aimed at identifying a climate signal in the tree-ring chronologies and BI chronologies in the Scots pine (Pinus sylvestris L.) in the north of Fennoscandia (Northern Lapland and the plain part of Kola Peninsula), and comparing the potential of these chronologies for reconstructing climatic parameters. Chronologies based on two proxies (tree-ring width and BI), from 233 to 434 years each one, were developed at four dendrochronological sites that create a 500 km long profile from 68.13°N 19.44°E to 66.30°N 35.42°E covering entirely northern Fennoscandia. The dendroclimatic analysis has shown that the tree-ring width proxy contains a July temperature signal at all sites, while the BI chronologies capture a wider range, from June to August, with both periods increasing to July-August and April-August respectively at the easternmost site. Temperature contributed about 50 % to the variation of the annual ring widths in the generalized chronologies, and more than 70 % to the BI dynamics. Temperature reconstructions performed on both proxies were relevant, but more accurate results were obtained using the BI chronology. Within the twentieth century, the reconstructions by both proxies revealed periods with both underestimated and overestimated temperatures

Pages
244–263
DOI
10.17516/1997-1389-0385
Paper at repository of SibFU
https://elib.sfu-kras.ru/handle/2311/147499

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