陆地牛的外形态作为一个新的巴列蒙松的代理
Hua Shen1, Rui Bao2, Chenglong Li3
1School of Life Sciences, Nanjing University, Nanjing, 210023, China.
Scientific reports
|March 22, 2025
概括
陆地牛外形态为重建亚洲夏季季风 (ASM) 变化提供了一种新方法. 这种生物代理揭示了ASM变异受多个轨道周期的影响,前行是主导的.
科学领域:
- 古气候学 古气候学
- 生物地质学 生物地质学
- 四分学科学 四分学科学
背景情况:
- 重建亚洲夏季季风 (ASM) 的变化对于理解气候动态至关重要.
- 现有的像loess和speleothems这样的代理显示相互矛盾的周期性,阻碍了对ASM强迫机制的理解.
- 由于石化和沉积速度,的物理化学代理是复杂的,需要新的,敏感的气候指标.
研究的目的:
- 评估陆地牛的形态作为重建季风气候变化的新型代理.
- 研究化石陆地牛 (Cathaica orithyia) 作为过去湿度和干旱度的敏感指标的潜力.
- 为了将新的基于贝形态的气候记录与现有的亚洲夏季季风记录进行比较.
主要方法:
- 对化石陆地牛外形态的分析,特别是孔径变化.
- 在过去的47万年里,从中国洛斯高原发现的Cathaica orithyia贝的平流图学调查.
- 将贝形态数据与已建立的古气候记录 (speleothem δ18O,loess代理) 进行比较,以确定主导周期.
主要成果:
- 陆地牛的外形态表现出明显的周期性,与轨道强迫周期保持一致.
- 贝形态记录显示了 precessional (23 kyr),斜率 (41 kyr) 和离心率 (100 和 400 kyr) 的周期.
- 贝形态中的强有力的 precessional 信号表明其在驱动 ASM 变异中的主导地位.
结论:
- 陆地牛的外形态是重建过去湿度和干旱度的可靠代理,受多种气候因素的影响.
- 亚洲夏季季风很可能被多个轨道周期强迫,前行起着主导作用.
- 与传统的代理相比,生物代理,如牛形态,提供更高的灵敏度和更全面的应对气候变化.
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