Skip to content

Research at St Andrews

Experiments based on blue intensity for reconstructing North Pacific temperatures along the Gulf of Alaska

Research output: Contribution to journalArticle

DOI

Open Access permissions

Open

Author(s)

Rob Wilson, Rosanne D'Arrigo, Laia Andreu-Hayles, Rose Oelkers, Greg Wiles, Kevin Anchukaitis, Nicole Davi

School/Research organisations

Abstract

Ring-width (RW) records from the Gulf of Alaska (GOA) have yielded a valuable long-term perspective for North Pacific changes on decadal to longer timescales in prior studies but contain a broad winter to late summer seasonal climate response. Similar to the highly climate-sensitive maximum latewood density (MXD) proxy, the blue intensity (BI) parameter has recently been shown to correlate well with year-to-year warm-season temperatures for a number of sites at northern latitudes. Since BI records are much less labour intensive and expensive to generate than MXD, such data hold great potential value for future tree-ring studies in the GOA and other regions in mid- to high latitudes. Here we explore the potential for improving tree-ring-based reconstructions using combinations of RW- and BI-related parameters (latewood BI and delta BI) from an experimental subset of samples at eight mountain hemlock (Tsuga mertensiana) sites along the GOA. This is the first study for the hemlock genus using BI data. We find that using either inverted latewood BI (LWBinv) or delta BI (DB) can improve the amount of explained temperature variance by > 10 % compared to RW alone, although the optimal target season shrinks to June–September, which may have implications for studying ocean–atmosphere variability in the region. One challenge in building these BI records is that resin extraction did not remove colour differences between the heartwood and sapwood; thus, long term trend biases, expressed as relatively warm temperatures in the 18th century, were noted when using the LWBinv data. Using DB appeared to overcome these trend biases, resulting in a reconstruction expressing 18th–19th century temperatures ca. 0.5 °C cooler than the 20th–21st centuries. This cool period agrees well with previous dendroclimatic studies and the glacial advance record in the region. Continuing BI measurement in the GOA region must focus on sampling and measuring more trees per site (> 20) and compiling more sites to overcome site-specific factors affecting climate response and using subfossil material to extend the record. Although LWBinv captures the inter-annual climate signal more strongly than DB, DB appears to better capture long-term secular trends that agree with other proxy archives in the region. Great care is needed, however, when implementing different detrending options and more experimentation is necessary to assess the utility of DB for different conifer species around the Northern Hemisphere.
Close

Details

Original languageEnglish
Pages (from-to)1007-1022
Number of pages16
JournalClimate of the Past
Volume13
Issue number8
DOIs
StatePublished - 16 Aug 2017

Discover related content
Find related publications, people, projects and more using interactive charts.

View graph of relations

Related by author

  1. Last millennium Northern Hemisphere summer temperatures from tree rings: part II, spatially resolved reconstructions

    Anchukaitis, K. J. , Wilson, R. , Briffa, K. R. , Büntgen, U. , Cook, E. R. , D'Arrigo, R. , Davi, N. , Esper, J. , Frank, D. , Gunnarson, B. E. , Hegerl, G. , Helama, S. , Klesse, S. , Krusic, P. J. , Linderholm, H. W. , Myglan, V. , Osborn, T. J. , Zhang, P. , Rydval, M. , Schneider, L. & 3 others Schurer, A., Wiles, G. & Zorita, E. 1 May 2017 In : Quaternary Science Reviews. 163, p. 1-22 22 p.

    Research output: Contribution to journalArticle

  2. Spatial reconstruction of Scottish summer temperatures from tree rings

    Rydval, M., Gunnarson, B. E., Loader, N. J., Cook, E. R., Druckenbrod, D. L. & Wilson, R. 15 Mar 2017 In : International Journal of Climatology. 37, 3, p. 1540-1556 17 p.

    Research output: Contribution to journalArticle

  3. Facilitating tree-ring dating of historic conifer timbers using Blue Intensity

    Wilson, R., Wilson, D., Rydval, M., Crone, A., Büntgen, U., Clark, S., Ehmer, J., Forbes, E., Fuentes, M., Gunnarson, B. E., Linderholm, H. W., Nicolussi, K., Wood, C. V. & Mills, C. Feb 2017 In : Journal of Archaeological Science. 78, p. 99-111 13 p.

    Research output: Contribution to journalArticle

  4. Reconstructing 800 years of summer temperatures in Scotland from tree rings

    Rydval, M., Loader, N. J., Gunnarson, B. E., Druckenbrod, D. L., Linderholm, H. W., Moreton, S. G., Wood, C. V. & Wilson, R. 12 Jan 2017 In : Climate Dynamics. First Online, 24 p.

    Research output: Contribution to journalArticle

  5. Detection and removal of disturbance trends in tree-ring series for dendroclimatology

    Rydval, M., Druckenbrod, D., Anchukaitis, K. J. & Wilson, R. Mar 2016 In : Canadian Journal of Forest Research. 46, 3, p. 387-401 15 p.

    Research output: Contribution to journalArticle

Related by journal

  1. A record of Neogene seawater δ11B reconstructed from paired δ11B analyses on benthic and planktic foraminifera

    Greenop, R., Hain, M. P., Sosdian, S. M., Oliver, K. I. C., Goodwin, P., Chalk, T. B., Lear, C. H., Wilson, P. A. & Foster, G. L. 24 Feb 2017 In : Climate of the Past. 13, 2, p. 149-170 22 p.

    Research output: Contribution to journalArticle

  2. Amplified bioproductivity during Transition IV (332 000-342 000 yr ago): evidence from the geochemical record of Lake El'gygytgyn

    Cunningham, L., Vogel, H., Wennrich, V., Juschus, O., Nowaczyk, N. & Rosen, P. 14 Mar 2013 In : Climate of the Past. 9, 2, p. 679-686 8 p.

    Research output: Contribution to journalArticle

ID: 250935587