Climate variability over the past 100 years in Myanmar derived from tree-ring stable oxygen isotope variations in Teak
Climate variability over the past 100 years in Myanmar derived from tree-ring stable oxygen isotope variations in Teak
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DOI：
10.1007/s00704-019-03036-y
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发表时间：
2019-12
影响因子：
3.4
通讯作者：
N. Pumijumnong;C. Muangsong;S. Buajan;M. Sano;T. Nakatsuka
中科院分区：
文献类型：
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作者：
N. Pumijumnong;C. Muangsong;S. Buajan;M. Sano;T. Nakatsuka
我们提出了一个100年的氧同位素记录柚木年轮纤维素（δ 18 O），来自缅甸南部的一个网站，保留了区域雨季的降雨的同位素比。树轮δ 18 O与5 ~ 10月降水量呈显著正相关（r=-0.353，p < 0.01）。结果表明，1948-1998年6 - 9月的树轮δ 18 O具有明显的印度夏季风（ISM）信号（r=-0.53，p < 0.01）。δ 18 O与9月最低气温呈显著负相关，与11月和12月最高气温呈显著正相关。研究发现，δ 18 O与8 ~ 10月最高气温与最低气温之差（DTR）呈显著正相关。结果表明，缅甸南部柚木树轮δ 18 O受季风季节降雨量和11、12月气温的控制。空间相关分析和谱分析表明，厄尔尼诺-南方涛动（ENSO）对柚木树轮δ 18 O有显著影响。此外，树轮δ 18 O还能捕捉到印度洋偶极子（IOD）的信号。
We present a 100-year oxygen isotope record from teak tree-ring cellulose (δ18O), originating from a site in southern Myanmar that preserves the isotopic ratios of the regional wet season’s rainfall. Tree-ring δ18O correlates strongly with regional rainfall during the months of May to October (r= − 0.353,p< 0.01). We found the tree-ring δ18O had clear signals of the June to September Indian Summer Monsoon (ISM) over the years 1948–1998 (r= − 0.53,p< 0.01). The δ18O has a significant and negative correlation with the minimum temperature in September and has a significant positive correlation with maximum temperature in November and December. The study found that δ18O has a significant positive correlation with the difference between the maximum temperature and the minimum temperature (DTR) in August to October. Based on our results, it can be concluded that tree-ring δ18O in teak in southern Myanmar is controlled by the amount of rainfall during the monsoon season and the temperature in the November and December. Spatial correlation and spectral analyses revealed a strong impact of the El Niño-Southern Oscillation (ENSO) on tree-ring δ18O of teak. In addition, tree-ring δ18O also captures the signal of the Indian Ocean Dipole (IOD).