在海洋碳观测系统中增加无偏见的Argo观测的重要性
Thea H Heimdal1, Galen A McKinley2
1Columbia University and Lamont-Doherty Earth Observatory, Palisades, NY, USA. theimdal@ldeo.columbia.edu.
Scientific reports
|August 26, 2024
概括
改善海洋碳汇估计需要更好的表面海洋pCO2数据. 添加无偏见的浮动观测显著增强了重建,但有偏见的数据降低了准确性.
科学领域:
- 海洋学 海洋学 海洋学
- 气候科学 气候科学
- 碳循环研究 碳循环研究
背景情况:
- 从船上直接观测表面海洋二氧化碳 (pCO2) 的部分压力正在下降,造成数据缺口.
- 精确的海洋碳汇估计依赖于高质量的表面海洋pCO2数据.
- 现有的数据缺口阻碍了对空海二氧化碳交换和海洋作为碳汇的作用的理解.
研究的目的:
- 评估自主平台 (浮动) 观测对重建全球表面海洋pCO2.2的影响.
- 评估浮动数据中的测量不确定性和偏差对pCO2重建的影响.
- 通过增强的pCO2数据覆盖,量化估计全球海洋碳汇的改进.
主要方法:
- 利用地球系统模型的大组测试台 (LET) 模拟"模型真相".
- 在全球表面海洋pCO2重建中采用了pCO2-残留方法.
- 仅使用船上的数据进行比较的重建与船上的数据和模拟的浮动数据 (含不确定性和不含不确定性) 进行比较.
主要成果:
- 仅靠船上的数据就导致了海面pCO2的高估,而碳汇的低估为0.1 Pg C年-1.
- 额外的浮动观测显著降低了碳汇低估值,甚至在随机不确定性的情况下,从"模型真相"中偏离了0.01 Pg C年-1,即使是随机不确定性.
- 浮动数据中的系统偏差严重降低了重建准确性,增加了碳汇低估值,高达0.32 Pg C年-1.
结论:
- 增加全球观测系统的浮动式观测可以大大改善表面海洋的pCO2重建.
- 浮动数据的准确性至关重要;对于可靠的pCO2重建和碳汇估计,需要公正的观测.
- 未来的努力应该集中在部署和维护高质量,公正的自主观测平台,以提高我们对海洋碳汇的理解.
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