| 摘要: |
| 定量化是过去全球气候变化研究的必然趋势,突变事件的诊断是古气候定量化研究中极其重要的过程.本文运用M-K法和t检验法对RH孔有机碳同位素序列进行了气候突变诊断研究.结果发现,近800kaBP来该区气候存在明显的突变,巨突变开始于470kaBP.进一步的研究发现470kaBP开始的这一气候突变事件与青藏高原的构造隆升有密切的关系. |
| 关键词: 若尔盖盆地 有机质碳同位素 气候诊断 |
| DOI：10.18307/1997.0401 |
| 分类号: |
| 基金项目:国家自然科学重点基金49131030;攀登项目85-029-02-01 |
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| Statistical detection of the organic matter δ13C recorded in core rh in zoige basin |
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Wu Jinglu, Wang Sumin
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Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008
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| Abstract: |
| By using statistical methods (t-test and M-K methods), the features of transition of the organic matter δ13C in the core RH in the Zoige basin have been studied. The result showed that there existed an apparently rapid transition in climate at 470kaBP. After 470kaBP.the climate became colder and drier. Further studies depicted that the abrupt event had a close relation to the uplift of Tibet Plateau, By analyzing the sequences of the organic matter δ13C in core RH. it is found that the values of δ13Corg at 470kaBP became low abruptly, indicating that the climate changed rapidly and caused the disappearance of C4 plants with higher duC value. After 470kaBP, the values of δ13Corg were relatively stable, showing that the vegetation types in the region which were mainly dominated by C3 plants with lower C value were formatted. Therefore, the fluctuation of δ13C values reflects the close relation between the variations of climate and the uplift of Tibet Plateau. |
| Key words: Zoige basin organic matter δ13C climatic detection |
