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基于多十年水文数据的生物碳估计

Wei-Lei Wang¹, Weiwei Fu^2,3, Frédéric A C Le Moigne⁴

¹State Key Laboratory of Marine Environmental Science, College of Ocean and Earth Sciences, Xiamen University, Xiamen, China. weilei.wang@xmu.edu.cn.

|December 6, 2023

概括

生物碳 (BCP) 将大气中的二氧化碳转移到深海, 但估计不同. 这项研究使用观测数据和反向模型来估计BCP强度,通过沉积颗粒和动物浮游生物发现显著的碳出口.

科学领域:

生地化学海洋学
气候科学
碳循环研究

背景情况:

生物碳 (BCP) 对于在深海中封存大气中的二氧化碳至关重要.
目前对BCP强度的估计是不一致的,地球系统模型显示出很大的差异.
了解所有碳出口途径对于准确的气候建模至关重要.

研究的目的:

通过观察数据提供生物碳强度的上下估计.
量化有机碳出口途径及其对封存的贡献.
调查海洋变暖对BCP的影响.

主要方法:

使用了几十年的水文观测.
采用一个反向的生物地化学模型来暗示所有已知的碳出口途径.
分割有机碳出口的封存时间 (τ) 低于euphotic区域.

主要成果:

在73.4m时估计的总有机碳 (TOC) 出口为15.00±1.12 Pg C年−1.
全球综合有机碳生产率为t > 3个月 (11.09 ± 1.02 Pg C年−1) 和t > 1年 (8.25 ± 0.30 Pg C年−1).
确定81%的长期封存 (τ>1年) 是由非向导扩散的垂直流 (沉入粒子和迁移动物浮游生物) 驱动的.

结论:

BCP的效率对温度敏感,这表明由于有机物循环的增加,在未来的全球变暖下可能会减弱.
虽然粒子沉没和动物浮游生物迁移占据了长期碳封存的地位,但混合和流体运输仍然具有区域意义.
碳出口路径的准确表示对于改善BCP的气候模型预测至关重要.

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