0473315 - ÚVGZ 2017 RIV IT eng J - Článek v odborném periodiku
Esper, J. - Schneider, L. - Smerdon, J. E. - Schoene, B. - Büntgen, Ulf
Signals and memory in tree-ring width and density data.
Dendrochronologia. Roč. 35, OCT (2015), s. 62-70. ISSN 1125-7865. E-ISSN 1612-0051
Institucionální podpora: RVO:67179843
Klíčová slova: summer temperature-variations * major volcanic-eruptions * european summer * chronologies * climate * variability * reconstruction * precipitation * millennium * centuries * Maximum latewood density * Temperature * Autocorrelation * Superposed epoch analysis * Volcanic eruption * Northern hemisphere
Kód oboru RIV: EH - Ekologie - společenstva
Impakt faktor: 2.107, rok: 2015

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 degrees N) indicate a stronger and delayed (1-2 years) response to large eruptions, compared to the lower latitude sites (<60 degrees 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.
Trvalý link: http://hdl.handle.net/11104/0270463