DBPapers
DOI: 10.5593/SGEM2015/B32/S14.066

LONG-TERM TREE-RING VARIABILITY IN THE NORTHERN SIBERIA AND ALTAI MOUNTAINS, RUSSIA

D. Ovchinnikov, L. Lyu, A. Kirdyanov
Thursday 24 September 2015 by Libadmin2015

References: 15th International Multidisciplinary Scientific GeoConference SGEM 2015, www.sgem.org, SGEM2015 Conference Proceedings, ISBN 978-619-7105-37-7 / ISSN 1314-2704, June 18-24, 2015, Book3 Vol. 2, 491-498 pp

ABSTRACT
Comparison of the long tree-ring series from different regions is important to understand low frequency climate variability over large regions, but it is difficult to identify common low frequency periodicity and their causes. A Hilbert-Huang transform method (HHT) was used to exam two regional temperature sensitive tree-ring width chronologies in the northern Siberia and Altai Mountains. Seven empirical modes were calculated for each tree-ring width chronology to represent high-, mid- and low-frequency signals. A low-frequency variability have identified the common 100-200-year long cycles for the regions. The cyclicity in tree radial growth is likely to be associated with solar periodicity (Gleissberg and Suess cycles). Thus, common decrease of tree-ring radial growth in the two regions around 1700 AD is possibly a result of reduced solar activity (Maunder minimum). The use of HHT method can provide the basis to extract low frequency in climate variability for remote regions to understand better global climate change.

Keywords: Hilbert-Huang transform method (HHT), tree-ring width chronology, northern Siberia, Altai Mountains.

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