亚洲大陆的树环异地图 δO:对古气候和古环境的影响
Ru Huang1,2, Chenxi Xu1,3, Wenling An1
1State Key Laboratory of Lithospheric and Environmental Coevolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China.
National science review
|December 22, 2025
概括
亚洲 亚洲 亚洲 亚洲
科学领域:
- 古气候学 古气候学
- 同位素地球化学 同位素地球化学
- 登德罗年代学 登德罗年代学
背景情况:
- 树环氧同位素 (δ18O_TR) 对于气候研究至关重要,但大陆规模的同位素地形还不发达.
- 了解 δ18O_TR 模式有助于大气循环,气候解释和木材追踪.
研究的目的:
- 为亚洲产生第一个大陆规模的树环氧同位素 (δ18O_TR) 同位素.
- 为了确定 δ18O_TR 模式的驱动因素,并评估古高度测量潜力.
主要方法:
- 编制了亚洲各地的313个多年平均 δ18O_TR记录.
- 使用XGBoost和随机森林机器学习模型生成的异构图.
- 分析了 δ18O_TR,降水同位素 (δ18O_P) 和海拔之间的关系.
主要成果:
- 确定了一个"三明治" δ18O_TR模式:在高/低度处耗尽,在中度处丰富.
- 确认降水 δ18O (δ18O_P) 是亚洲 δ18O_TR 模式的主要驱动因素.
- 除印度夏季季风地区外,发现了微不足道的大陆 δ18O_TR-海拔联系.
结论:
- 亚洲首个大陆规模的 δ18O_TR 异地图为大气和树枝发育研究提供了基础.
- 基于 δ18O 的古高度计在印度夏季季风等主导湿度来源的地区最有效.
- 树环同位素为过去的气候动态和地理起源提供了宝贵的见解.
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