%0 Journal Article
%T Specific climatic signals recorded in earlywood and latewood ¦Ä18O of tree rings in southwestern China
%A Wenling An
%A Xiaohong Liu
%A Steven W. Leavitt
%A Jiawen Ren
%J Tellus B
%D 2012
%I Co-Action Publishing
%R 10.3402/tellusb.v64i0.18703
%X 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 ¦Ä18O in tree rings from the Yulong Snowy Mountains of southwestern China, covering the period from 1902 to 2005. Earlywood and latewood ¦Ä18O exhibit different long-term behaviour obviously during the past century. Climate¨Cresponse analysis indicates that the dominant parameters for earlywood ¦Ä18O 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 ¦Ä18O. The ¦Ä18O of source water were reconstructed from the earlywood and latewood ¦Ä18O. 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 Ni o¨CSouthern Oscillation events.
%K tree-ring ¦Ä18O
%K earlywood
%K latewood
%K source water
%K atmospheric circulation
%U http://www.tellusb.net/index.php/tellusb/article/view/18703/pdf_1