在米奥森时期,阿拉伯海和太平洋氧气最小区域的对比演变
Anya V Hess1,2, Alexandra Auderset3,4, Yair Rosenthal1
1Rutgers, the State University of New Jersey, Department of Earth and Planetary Sciences, Piscataway, NJ USA.
概括
海洋氧气最小区域在温暖的米奥生气候最佳时期得到更好的氧气. 阿拉伯海表现出延迟的脱氧,表明复杂的区域海洋学影响氧气水平.
科学领域:
- 古海洋学是古海洋学.
- 海洋生物地质化学海洋生物地质化学
- 气候科学 气候科学
背景情况:
- 自20世纪中叶以来,海洋氧气最小区在全球范围内扩大.
- 苗代气候最佳时期 (17.0-14.8万年) 是一个温暖的时期,在东部热带北太平洋地区有更好的氧化证据.
- 全球海洋氧化对米奥生时期变暖的反应仍然不完全理解.
研究的目的:
- 为了重建阿拉伯海的米奥森海洋氧化,这是第二大氧气最小区域.
- 为了调查在北太平洋的米奥生气候最佳时期观察到的改善氧化是否是一个全球现象.
- 了解控制阿拉伯海去氧化历史的因素.
主要方法:
- 在浮游生物中微量元素的分析.
- 在浮游生物中进行同位素分析.
- 过去海洋学条件的重建.
主要成果:
- 与今天的条件相比,阿拉伯海在米奥生气候最佳时期的氧气含量更高.
- 阿拉伯海的脱氧落后于继米奥生气候最佳期之后的全球冷却趋势.
- 区域海洋学因素,如原季风和Tethys外流,影响了脱氧的时间.
结论:
- 阿拉伯海,就像北太平洋一样,在温暖的中世时期得到了更好的氧气供应.
- 区域海洋学过程在氧气最小区域的脱氧动态中发挥着关键作用.
- 在氧气最小区的未来脱氧趋势可能会表现出复杂性,特别是在受到季风系统和边缘海洋流入影响的地区.
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