Separating the climatic signal from tree-ring width and maximum latewood density records |
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Authors: | Alexander V Kirdyanov Eugene A Vaganov Malcolm K Hughes |
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Institution: | (1) Institute of Forest SB RAS, Akademgorodok, Krasnoyarsk, 660036, Russia;(2) Laboratory of Tree-Ring Research, University of Arizona, Tucson, AZ 85271, USA |
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Abstract: | We propose a technique for separating the climatic signal which is contained in two tree-ring parameters widely used in dendroclimatology.
The method is based on the removal of the relationship between tree-ring width (TRW) and maximum latewood density (MXD) observed
for narrow tree rings from high latitudes. The new technique is tested on data from three larch stands located along the northern
timberline in Eurasia. Correlations were calculated between the temperatures of pentads (five consecutive days), TRW chronologies
and MXD chronologies calculated according to the standard and proposed methods. The analysis confirms the great importance
of summer temperature for tree radial growth and tree-ring formation. TRW is positively correlated with the temperature of
four to eight pentads (depending on the region) at the beginning of the growth season, but MXD as obtained by the standard
technique is correlated with temperature over a much longer period. For maximum density series from which the relationship
between MXD and TRW has been removed (MXD′), there is a clear correlation with temperatures in the second part of the growing
season. These results are consistent with the known dynamics of tree-ring growth in high latitudes and mechanisms of tree-ring
formation. |
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Keywords: | Larch Tree-ring width/density relations Climate signal Summer temperature Dendroclimatology |
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