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反向气候作为海洋pH和行星气候的长期稳定剂
Terry T Isson1, Noah J Planavsky2
1Department of Geology and Geophysics, Yale University, New Haven, CT, USA. terry.t.isson@gmail.com.
Nature
|August 10, 2018
概括
地球的早期
科学领域:
- 地质化学
- 古气候学
- 海洋学
背景情况:
- 尽管太阳的亮度较低,但地球的早期气候还是温暖而稳定的.
- 保持大气中二氧化碳 (CO2) 水平的高是这种温暖的关键.
- 有关二氧化碳调节的现有理论进行了讨论.
研究的目的:
- 研究海洋过程在早期地球气候调节中的作用.
- 探索海洋pH如何影响碳循环和大气CO2.
- 确定维持一个稳定的,没有冰的前坎布里亚世界的机制.
主要方法:
- 使用全球碳循环模型.
- 模拟海洋pH的演变及其对碳分离的影响.
- 分析了外基性粘土形成 (逆气候变化) 对性和酸性的影响.
主要成果:
- 较高的"逆气候变化"率增加了海洋-大气系统中的碳保留.
- 这一过程导致大气二氧化碳的基线水平上升.
- 海洋pH值与土壤形成之间的负反使气候稳定.
结论:
- 反向气候变化,特别是在富含的早期海洋中,保持了温暖的,没有冰的前剑桥气候.
- 这种地化学缓冲剂缓解了大气二氧化碳的巨大波动.
- 反向气候的衰退可能会破坏后来的地球气候.
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