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Influence of Sampling Site and Detrending M ethod on Correlations and Climate Signals of Spruce Treering Width Chronologies at Upper Tree Line in Western Tianshan Mountains of Xinjiang
Paper ID : 1018-ADA2013
Authors:
Yuan Yujiang *1, Yu Shulong2, Zhang Ruibo2
146# Jianguo Road, Urmqi, Xinjiang, China 830002
2Institute of Desert Meteorology, China Meteorology Administration
Abstract:
As a climate transitional zone, Tianshan mountainous area is known as a "wet island" of arid region, providing water resources for the North and the South of Tianshan by runoff formed from rainfall or accumulation and melting of ice and snow.Based on the tree ring width data of spruce from the upper tree lines on northern slope of western Tianshan Mountains in Yili and Bozhou region of Xinjiang，the tree-ring width chronologies were developed by using the three different detrending methods，i．e．regional curves，negative exponential curves(no positive slope)and 300-year fixed splines．Analyses on the effect of different sampling sites and different detrending methods on correlation between tree-ring width chronologies in different frequency domains and their climate signals showed：① Distance between two sampling sites and whether chronologies are in the same climate area are import factors that influence the correlation between two tree-ring width chronologies．There are better sim ilarity in the higher frequency domain and greater different in the lower frequency in the changes of tree—ring width at the three different sampling sites，which implies that the tree-ring width chronologies maybe possess large potential in application for disclosing and reconstructing the climate change of higher frequency domain on large scale．② The tree ring width chronologies developed from Negative Exponent and Spline Detrending methods are similar，but that developed from Regional Curve Detrending Method can remain more information of tree ring width change on lower frequency domain．③ Precipitation is the first limiting factor that influences the tree ring width growth of spruce on upper tree line in the western Tianshan Mountains and the effect has obvious hysteresis．④ Regional curve detrending method can keep more moisture information in the tree ring width chronology of spruce on upper tree line in the western Tianshan Mountains of Xingjiang
Keywords:
western Tianshan Mountains of Xinjiang：tree-ring width chronology of spruce；sampling site；detrending method；climate signal
Status : Abstract Accepted