Specific climatic signals recorded in earlywood and latewood δ18O of tree rings in southwestern China
Specific climatic signals recorded in earlywood and latewood δ18O of tree rings in southwestern China
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DOI：
10.3402/tellusb.v64i0.18703
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发表时间：
2012-01
期刊：
影响因子：
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通讯作者：
W. An;Xiaohong Liu;S. Leavitt;Jiawen Ren;Weizheng Sun;Wenzhi Wang;Yu Wang;Guobao Xu;Tuo Chen-Tu
中科院分区：
文献类型：
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作者：
W. An;Xiaohong Liu;S. Leavitt;Jiawen Ren;Weizheng Sun;Wenzhi Wang;Yu Wang;Guobao Xu;Tuo Chen-Tu
早木和晚木在生长季节的不同时期形成，因此捕捉了不同时间间隔的气候。本文对1902 ~ 2005年玉龙雪山树木年轮的早、晚木材δ18O进行了比较。近一个世纪以来，早期和晚期δ18O表现出明显不同的长期行为。气候响应分析表明，季风季节前期（5 ~ 7月）的温度和相对湿度是早期降水δ18O的主导参数；而晚木则是8月至10月的水分状况（降水和相对湿度）。印度洋和太平洋海面温度对早期和晚期的δ18O有不同的影响。源水的δ18O由早、晚两期的δ18O重建。我们发现，早期木材合成水的来源主要是由当前降水贡献的，而晚期木材合成水的来源则更为复杂。来自印度夏季风和东亚夏季风的信号在时间上（尽管不同）叠加在早木和晚木的水源上，以及El Niño-Southern振荡事件。
ABSTRACT 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 δ18O in tree rings from the Yulong Snowy Mountains of southwestern China, covering the period from 1902 to 2005. Earlywood and latewood δ18O exhibit different long-term behaviour obviously during the past century. Climate–response analysis indicates that the dominant parameters for earlywood δ18O 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 δ18O. The δ18O of source water were reconstructed from the earlywood and latewood δ18O. 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.