关于陆地输入到热带东北大西洋的定量研究
1Joint International Research Laboratory of Catastrophe Simulation and Systemic Risk Governance, Beijing Normal University, Zhuhai, 519087, China; School of National Safety and Emergency Management, Beijing Normal University, Zhuhai, 519087, China.
Marine environmental research
|April 4, 2024
概括
这项研究使用沉积物记录重建了过去的海洋状况. 研究人员发现,在最后的冰川最大时期,风尘和河流输入减少,与东北大西洋的较慢的深海流相伴.
科学领域:
- 海洋地质学 海洋地质学
- 古海洋学是古海洋学.
- 生物地质化学生物地质化学
背景情况:
- 诸如风尘和河流排放等陆地输入对海洋微量营养素和碳循环至关重要.
- 准确量化过去的陆地输入到海洋仍然是一个挑战,因为目前的模型和代理的局限性.
研究的目的:
- 用沉积物重量百分比碳酸 (wtCaCO3%) 记录来估计石化流.
- 在热带东北大西洋的全新纪和最后的冰川最大值 (LGM) 期间调查CaCO3保存的深度依赖性.
主要方法:
- 使用沉积物wtCaCO3%记录来估计石化流量.
- 应用碳酸盐溶解模型来描述CaCO3的保存.
- 分析了来自热带东北大西洋两个主要盆地的沉积物.
主要成果:
- 估计在LGM期间在加拿大盆地减少了尘埃沉积.
- 在LGM期间,在佛得角边缘观察到河流输入的轻微下降.
- 在LGM期间,与现在相比,深度亚热带东北大西洋的深水循环更为缓慢.
结论:
- 沉积物记录为过去的陆地输入和海洋学条件提供了宝贵的见解.
- 东北大西洋的LGM的特点是变化的陆地流动和减少的深海循环.
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