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在冰川开始期间,大西洋深处的生物碳储存逐渐增加
Monica Garity1, David Lund1, Hope Jerris1,2
1Department of Marine Sciences, University of Connecticut, Groton, CT 06340.
概括
深大西洋的碳储存在最后一个冰川周期中显著影响了大气中的二氧化碳 (CO2) 水平. 增强的封存发生在二氧化碳下降期间,而释放发生在变暖期间.
科学领域:
- 古海洋学是古海洋学.
- 气候科学 气候科学
- 海洋地球化学 海洋地球化学
背景情况:
- 在冰川周期期间大气二氧化碳的变化与海洋循环和碳储存有关.
- 海洋碳酸盐化学的重建很少,这阻碍了对冰川二氧化碳驱动因素的共识.
- 了解过去的二氧化碳波动对于预测未来的气候变化至关重要.
研究的目的:
- 在关键大气二氧化碳变化间隔期间调查西南大西洋的海洋碳捕获.
- 重建碳酸盐离子度 ([CO3^2-]) 和稳定同位素 (δ13C, δ18O) 的垂直配置文件.
- 为了阐明推动大气二氧化碳在最后一个冰川周期的变化机制.
主要方法:
- 来自西南大西洋的碳酸离子度 ([CO3^2-]) 垂直概况的分析.
- 来自相同核心位置的稳定同位素 (δ13C和δ18O) 的对分析.
- 地化学数据与已知的大气二氧化碳记录和古海洋学代理数据的相关性.
主要成果:
- 在第一个主要的二氧化碳下降 (115-109 ka) 期间,在深的大西洋 (>3,500 m) 观察到增强的碳储存.
- 在第二次二氧化碳下降 (72-68 ka) 期间,整个大西洋深度 (>2,000 m) 发生了碳捕获.
- 在第二次二氧化碳下降期间,海底碳酸溶解和性增强发生,这有助于二氧化碳的吸收.
- 从南大西洋深处释放的碳是在冰川终结I和II期间记录的,当时大气中的二氧化碳正在上升.
结论:
- 在南大西洋,随着南方源水在冰川开始时扩大,生物碳的缓存逐渐增加.
- 碳酸盐离子和地平线的化起到了通过增强的性来减少二氧化碳的作用.
- 大气中的二氧化碳水平和大西洋深层碳储存在最后一个冰川周期之间存在着密切的联系.
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