安图红松树轮稳定δ^(13)C、δ^(18)O序列记录的气候变化信息

INFORMATION ON CLIMATE CHANGE RECORDED IN Δ^(13)C AND Δ^(18)O SERIES OF PINUS KORAIENSIS TREE RING CELLULOSE IN ANTU AREA

测定了安图红松树轮稳定碳、氧同位素组成。选取与安图县毗邻的敦化市气象记录 ,分析了气象记录与树轮稳定碳、氧同位素的相关关系 ,发现红松树轮碳、氧同位素对气候变化均有显著的响应。合成了复合温湿指标 (TH) ,相关分析表明树轮碳、氧同位素对复合温湿指标的响应更加灵敏 ,而且碳同位素和氧同位素均对 5～ 8月的平均复合温湿指标有显著的响应。建立了碳、氧同位素对气候因子的响应函数 ,重建了安图地区近 2 0 0年来的气候变化。功率谱分析发现碳、氧同位素组成在 95 %的置信水平上存有准 2 0 0年、准 11年、准 4年和准 2年的变化周期。前两个周期变化基本上与太阳活动周期变化一致 ,后两个周期分别对应于“厄尔尼诺现象”和东亚夏季风的“准 2年振荡”。

The stable carbon and oxygen isotopic composition of Pinus koraiensis tree ring cellulose was measured to study climate changes in the Antu area. Climate records were chosen from Dunhua climate station that is adjacent to the Antu area and has a relatively long time of climate records. Correlation analysis was performed to investigate the relationship between isotope ratios and climatic parameters. The stable carbon and oxygen isotopic composition of Pinus koraiensis tree ring cellulose is significantly correlated with the climatic parameters. A combined climate index of temperature and humidity (TH) was established. Correlation analysis between the combined index and the climatic parameters indicates that the respondence of δ 13 C and δ 18 O to the combined index is more significant. Both δ 13 C and δ 18 O are significantly correlated with the mean combined index from May to August. Climate in recent 200 years was reconstructed based on the regression equations between isotopic composition and climatic parameters. Quasi 200 yr, quasi 11 yr, quasi 4 yr, quasi 2 yr periods were detected in δ 13 C series and δ 18 O series by power spectrum analysis. The former two periods are the reflections of solar activity. The later two can be interpreted as the reflections of ENSO and Quasi Biennial Oscillation of the East Asian monsoon, respectively.