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Signals and memory in tree-ring width and density data
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2015 (Engelska)Ingår i: Dendrochronologia, ISSN 1125-7865, E-ISSN 1612-0051, Vol. 35, nr Supplement C, 62-70 s.Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Abstract It has been suggested that maximum latewood density (MXD) should be used instead of tree-ring width (TRW) data to reconstruct post-volcanic cooling effects. A thorough assessment of high frequency signals and potentially differing memory effects in long MXD and TRW chronologies, in response to large volcanic eruptions, is still missing, however. We here present a compilation of MXD and TRW chronologies from 11 sites in the Northern Hemisphere, covering the past 750+ years, and containing significant June–August temperature signals. Basic assessment of the data using Superposed Epoch Analysis reveals a temporally extended response in TRW, by 2–3 years, to large volcanic eruptions, though post-volcanic cooling patterns vary considerably within the Northern Hemisphere network. Comparison with instrumental temperature data demonstrates the TRW chronologies underestimate cold conditions associated with large volcanic eruptions, a bias that is mitigated in the MXD data. While species composition (pine, spruce, larch) has no detectable influence on the cooling patterns, trees from high latitude sites (>60°N) indicate a stronger and delayed (1–2 years) response to large eruptions, compared to the lower latitude sites (<60°N). These basic findings caution against using TRW data for quantitatively estimating post-volcanic cooling and for comparison against the simulated climate effects of volcanic eruptions in models.

Ort, förlag, år, upplaga, sidor
2015. Vol. 35, nr Supplement C, 62-70 s.
Nyckelord [en]
Maximum latewood density, Temperature, Autocorrelation, Superposed epoch analysis, Volcanic eruption, Northern hemisphere
Nationell ämneskategori
Naturvetenskap
Identifikatorer
URN: urn:nbn:se:polar:diva-3829DOI: 10.1016/j.dendro.2015.07.001OAI: oai:DiVA.org:polar-3829DiVA: diva2:1156207
Tillgänglig från: 2017-11-10 Skapad: 2017-11-10 Senast uppdaterad: 2017-11-10

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Förlagets fulltexthttp://www.sciencedirect.com/science/article/pii/S112578651500048X
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