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dc.contributor.authorWilson, R.
dc.contributor.authorAnchukaitis, K
dc.contributor.authorAndreu-Hayles, L
dc.contributor.authorCook, E
dc.contributor.authorD’Arrigo, R
dc.contributor.authorDavi, N
dc.contributor.authorHaberbauer, L
dc.contributor.authorKrusic, P
dc.contributor.authorLuckman, B
dc.contributor.authorMorimoto, D
dc.contributor.authorOelkers, R
dc.contributor.authorWiles, G
dc.contributor.authorWood, C.
dc.identifier.citationWilson , R , Anchukaitis , K , Andreu-Hayles , L , Cook , E , D’Arrigo , R , Davi , N , Haberbauer , L , Krusic , P , Luckman , B , Morimoto , D , Oelkers , R , Wiles , G & Wood , C 2019 , ' Improved dendroclimatic calibration using blue intensity in the southern Yukon ' , The Holocene , vol. Online First .
dc.identifier.otherPURE: 260273728
dc.identifier.otherPURE UUID: 9475c7a0-c458-48e8-b4f2-e834e43bf1be
dc.identifier.otherRIS: urn:D0BEDEE08A5058A1FA1ADB432366E088
dc.identifier.otherORCID: /0000-0003-4486-8904/work/59953605
dc.identifier.otherWOS: 000478316800001
dc.identifier.otherScopus: 85070337003
dc.descriptionThis work was funded by the US National Science Foundation (NSF) Grants AGS 1159430, AGS 1502186, AGS 1502150, PLR 15-04134, PIRE 1743738, AGS-15-167 and PLR16-03473.en
dc.description.abstractIn north-western North America, the so-called divergence problem (DP) is expressed in tree ring width (RW) as an unstable temperature signal in recent decades. Maximum latewood density (MXD), from the same region, shows minimal evidence of DP. While MXD is a superior proxy for summer temperatures, there are very few long MXD records from North America. Latewood blue intensity (LWB) measures similar wood properties as MXD, expresses a similar climate response, is much cheaper to generate and thereby could provide the means to profoundly expand the extant network of temperature sensitive tree-ring (TR) chronologies in North America. In this study, LWB is measured from 17 white spruce sites (Picea glauca) in south-western Yukon to test whether LWB is immune to the temporal calibration instabilities observed in RW. A number of detrending methodologies are examined. The strongest calibration results for both RW and LWB are consistently returned using age-dependent spline (ADS) detrending within the signal-free (SF) framework. RW data calibrate best with June–July maximum temperatures (Tmax), explaining up to 28% variance, but all models fail validation and residual analysis. In comparison, LWB calibrates strongly (explaining 43–51% of May–August Tmax) and validates well. The reconstruction extends to 1337 CE, but uncertainties increase substantially before the early 17th century because of low replication. RW-, MXD- and LWB-based summer temperature reconstructions from the Gulf of Alaska, the Wrangell Mountains and Northern Alaska display good agreement at multi-decadal and higher frequencies, but the Yukon LWB reconstruction appears potentially limited in its expression of centennial-scale variation. While LWB improves dendroclimatic calibration, future work must focus on suitably preserved sub-fossil material to increase replication prior to 1650 CE.
dc.relation.ispartofThe Holoceneen
dc.rightsCopyright © The Author(s) 2019,SAGE Publications. This work is made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at
dc.subjectAge-dependent splineen
dc.subjectBlue intensityen
dc.subjectSummer temperature reconstructionen
dc.subjectTree ringen
dc.subjectWhite spruceen
dc.subjectGE Environmental Sciencesen
dc.subjectGB Physical geographyen
dc.titleImproved dendroclimatic calibration using blue intensity in the southern Yukonen
dc.typeJournal articleen
dc.contributor.institutionUniversity of St Andrews.School of Earth & Environmental Sciencesen
dc.contributor.institutionUniversity of St Andrews.Scottish Oceans Instituteen
dc.contributor.institutionUniversity of St Andrews.St Andrews Sustainability Instituteen
dc.description.statusPeer revieweden

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