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Research article - Peer-reviewed, 2011

Blue intensity in Pinus Sylvestris tree rings: A manual for a new palaeoclimate proxy

Campbell, Rochelle; McCarroll, Danny; Robertson, Iain; Loader, Neil J.; Grudd, Håkan; Gunnarson, Björn


Minimum blue intensity is a reflected light imaging technique that provides an inexpensive, robust and reliable surrogate for maximum latewood density. In this application it was found that temperature reconstructions from resin-extracted samples of Pious sylvestris (L.) from Fennoscandia provide results equivalent to conventional x-ray densitometry. This paper describes the implementation of the blue intensity method using commercially available software and a flat-bed scanner. A calibration procedure is presented that permits results obtained by different laboratories, or using different scanners, to be compared. In addition, the use of carefully prepared and chemically treated 10-mm-diameter cores are explored; suggesting that it may not be necessary to produce thin laths with the rings aligned exactly perpendicular to the measurement surface.


Dendrochronology; Scots pine; x-ray density; resin extraction; Fennoscandia

Published in

Tree-Ring Research
2011, volume: 67, number: 2, pages: 127-134
Publisher: TREE-RING SOC

Authors' information

Campbell, Rochelle
McCarroll, Danny
Robertson, Iain
Loader, Neil J.
Grudd, Håkan
Gunnarson, Björn
Swedish University of Agricultural Sciences, Department of Forest Ecology and Management

UKÄ Subject classification

Environmental Sciences related to Agriculture and Land-use

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