采样深度对CO流量估计的影响
Cátia C Azevedo1,2, Melchor González-Dávila3, J Magdalena Santana-Casiano3
1Dom Luiz Institute, Faculty of Sciences, University of Lisbon, Lisbon, Portugal. catia.azevedo@oom.arditi.pt.
Scientific reports
|August 9, 2024
概括
海洋二氧化碳流量受到取样深度的重大影响. 在不同海洋深度的测量显示出大量的差异,强调需要考虑采样深度,以准确估计碳预算.
科学领域:
- 海洋学 海洋学 海洋学
- 气候科学 气候科学
- 生物地质化学生物地质化学
背景情况:
- 微量气体的空海交换对地球气候调节至关重要.
- 海洋二氧化碳 (CO2) 流动受到风速,海温和盐度的影响.
- 准确量化二氧化碳流量对于了解全球碳循环至关重要.
研究的目的:
- 为了量化二氧化碳流量 (FCO2),使用在不同深度 (1,5,10米) 的二氧化碳 (pCO2) 部分压力测量.
- 调查风避区和风暴露区对海洋碳预算的影响.
- 评估采样深度对估计表面二氧化碳流量的影响.
主要方法:
- 在每天循环中测量温度,盐度和pCO2的垂直概况.
- 二氧化碳流量是基于不同海深的pCO2差异来计算的.
- 估计的二氧化碳流量与现有数据集 (SOCAT) 的比较.
主要成果:
- 在更温暖,更阳光明的时期,pCO2水平较高,但最高的FCO2与增加的风速相关.
- 估计的FCO2随着深度的增加而显著下降:在受保护区域下降了71%;在暴露区域下降了44% (比较1米到10米).
- 表面FCO2估计值 (97.6%) 远高于大西洋盆地5米深度报告的FCO2估计值.
结论:
- 采样深度是一个关键因素,显著影响估计的海洋二氧化碳流的准确性.
- 以前的估计可能低估了真正的二氧化碳流量,因为没有充分考虑深度依赖的变化.
- 未来对空海二氧化碳交换的研究必须包括多重深度测量,以进行可靠的碳预算评估.
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