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作为与热带北大西洋撒哈拉沙漠尘埃沉积相关的临时出口生产的替代品,可可利特-石 Sr/Ca

C V Guerreiro^1,2,3, P Ziveri^4,5, C Cavaleiro⁶

¹MARE - Marine and Environmental Sciences Centre/ARNET - Aquatic Research Network, Faculty of Sciences of the University of Lisbon (FCUL), Lisbon, Portugal. cataguerreiro@fc.ul.pt.

Scientific reports

|February 21, 2024

概括

大气中的尘埃沉积影响海洋肥沃和碳出口. 较高的尾石石 Sr/Ca 表示出口产量增加,特别是在较多尘埃的春季条件下.

科学领域:

海洋生物地质化学海洋生物地质化学
古海洋学是古海洋学.
气候科学气候科学

背景情况:

大气中的尘埃沉积影响地球的气候和大气中的二氧化碳,通过使海洋肥沃并增强生物碳.
撒哈拉沙漠的尘埃在海洋营养动力学和碳循环中发挥着关键作用.
尾石酸盐Sr/Ca的比率是了解尾石出口生产的替代值.

研究的目的:

为了区分撒哈拉沙漠尘埃对海洋肥化的生物地质化学影响与压载.
调查尾石石酸盐Sr/Ca与尾石出口生产驱动因素之间的关系.
分析西热带北大西洋化和出口的季节性变化.

主要方法:

从一年的沉积物陷时间序列记录 (2012-2013) 中分析了科利特石的Sr/Ca比率.
从西热带北大西洋 (M4-49°N/12°W) 采集样本.
分离虫大小小部分以分析特定物种的Sr合并.

主要成果:

高的Sr/Ca比率与上方光热区的出口产量增加相关,特别是在风,干燥和尘土充的春季条件下.
秋季较低的Sr/Ca比率表明,较小的物种减少了Sr的吸收,并且在快速出口事件中减少了老虫的吸收,这可能受到湿尘压制的影响.
在较大的尾虫大小小部分中,Sr/Ca的升高支持了这样一个假设:较大的尾虫体内含有更多的.
在大型花粉碎片中识别富含的物种 *Scyphosphaera apsteinii*.

结论:

科利特石Sr/Ca是出口产量的重要指标,其较高的值与尘埃状况有关.
/的季节性变化反映了物种组成,大小和影响化的环境因素的变化.
尘埃沉积影响营养的可用性和通过压机制的碳的物理出口.

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