Publication Date:
2012-07-21
Description:
Earlywood and latewood form during different parts of the growing season and therefore capture climate of distinct time intervals. Here we present a comparison of earlywood and latewood δ 18 O in tree rings from the Yulong Snowy Mountains of southwestern China, covering the period from 1902 to 2005. Earlywood and latewood δ 18 O exhibit different long-term behaviour obviously during the past century. Climate−response analysis indicates that the dominant parameters for earlywood δ 18 O are temperature and relative humidity during the early part of the monsoon season (May to July); however, for latewood, it is the moisture condition (precipitation and relative humidity) from August to October. Sea-surface temperatures over the Indian Ocean and the Pacific Ocean have imprinted their different influences on the earlywood and latewood δ 18 O. The δ 18 O of source water were reconstructed from the earlywood and latewood δ 18 O. We found that the source of the water synthesised into earlywood was mainly contributed by current precipitation, while for latewood it is more complicated. The signals from the Indian Summer Monsoon and the East Asian Summer Monsoon are temporally superimposed (though differently) on the source water of earlywood and latewood, as well as the El Niño−Southern Oscillation events. Keywords: tree-ring δ 18 O, earlywood, latewood, source water, atmospheric circulation (Published: 20 July 2012) Citation: Tellus B 2012, 64 , 18703, http://dx.doi.org/10.3402/tellusb.v64i0.18703
Print ISSN:
0280-6509
Electronic ISSN:
1600-0889
Topics:
Geography
,
Physics
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