一个贝叶斯反转的排放和出口生产力跨越白纪末的边界
Alexander A Cox1, C Brenhin Keller1
1Department of Earth Sciences, Dartmouth College, Hanover, NH 03755, USA.
概括
这项研究揭示了火山活动导致的二氧化碳 (CO2) 和二氧化硫 (SO2) 排放. 在此期间,海洋生产力下降了两级.
科学领域:
- 古气候学
- 地质化学
- 地球系统科学
背景情况:
- 纪末期的大规模灭绝受到奇克苏鲁布撞击和德坎陷火山的影响.
- 了解这些事件对环境的影响对于了解灭绝机制至关重要.
研究的目的:
- 量化二氧化碳 (CO2) 和二氧化硫 (SO2) 排放量,出口生产率和675万年前的再矿物化.
- 为了区分奇克苏鲁布撞击和德坎陷火山的环境强迫作用.
主要方法:
- 使用并行马尔科夫链蒙特卡洛方法进行模型反转.
- 采用长期海洋-大气-沉积物碳循环储备 (LOSCAR) 模型.
- 综合观察和代理数据用于模型验证.
主要成果:
- 确定了脱的二氧化碳和二氧化排放,表明了明显的火山和影响相关的贡献.
- 出口生产率出现了两阶段的下降,随后出现了长期的复苏阶段.
- 没有在白纪 - 古纪边界直接检测到任何显著的挥发性冲动.
结论:
- 这项研究提供了对白纪末期大规模灭绝过程中的环境动态的精细理解.
- 开发的反转方法为高效分析复杂的地球系统模型提供了途径.
- 结果突出了火山活动的复杂相互作用及其对海洋生物地质化学的影响.
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