Abstract
Based on cross-dating tree ring age from Tianmu Mountain, Zhejiang Province, the δ D of each tree ring nitrocellulose was measured and then the δ D annual time series was established. Using meteorological data from Tianmu Mountain Observatory, the responds of δ D of tree ring to climatic factors were analyzed. The results suggest that the δ D time series of the tree ring correlates well with climatic conditions, primarily with precipitation of the second half of each year, average annual air temperature and average annual maximum air temperature. The reconstructed maximum winter air temperature by the δ D of tree ring is in good correlation with local instrumental data. The low-frequency variations of reconstructed mean maximum air temperature of the winter in Tianmu Mountain corroborate with the temperature change in a large special scale. Tianmu Mountain is located in winter monsoon sensitive zone, thus the influence of winter temperature on tree growth is quite obvious. The results in this paper suggest that δ D of tree ring is an effective proxy for winter temperature in non-limited regions. Keywords: tree ring, nitrocellulose, δ D time series, paleoclimatic reconstruction.
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