Baudena Alberto, Laxenaire Rémi, Catalano Camille, Ioannou Artemis, Leymarie Edouard, Picheral Marc, Poteau Antoine, Speich Sabrina, Stemmann Lars, Kiko Rainer
Sorbonne Université, CNRS, Laboratoire d'Océanographie de Villefranche, Villefranche-sur-Mer, France.
Consiglio Nazionale Delle Ricerche- Istituto di Scienze Marine (CNR-ISMAR), Lerici, SP Italy.
Commun Earth Environ. 2025;6(1):318. doi: 10.1038/s43247-025-02262-9. Epub 2025 Apr 24.
Quantifying the ocean's ability to sequester atmospheric carbon is essential in a climate change context. Measurements of gravitational carbon export to the mesopelagic seldom balance the carbon demand or the oxygen consumption there, suggesting the potential presence of other mechanisms of carbon export. We deployed a biogeochemical Argo float in a cyclone in the Benguela upwelling system for five months, and estimated vertical carbon export and respiration in the eddy via particle imagery with an underwater vision profiler 6 in a quasi Lagrangian way. A sensitivity analysis shows that, under certain assumptions, oxygen consumption rates could match the carbon supply and carbon demand. We furthermore identified a mechanism of vertical particulate carbon export, the full eddy core submergence pump. Our analysis suggests that at 450 m depth, within this eddy, this pump exports about one fourth to half of the total carbon compared to the biological gravitational pump.
在气候变化背景下，量化海洋封存大气碳的能力至关重要。对向海洋中层的重力碳输出的测量很少能平衡那里的碳需求或氧气消耗，这表明可能存在其他碳输出机制。我们在本格拉上升流系统的一个气旋中部署了一个生物地球化学Argo浮标，为期五个月，并通过水下视觉剖面仪6以准拉格朗日方式利用粒子图像估计了该涡旋中的垂直碳输出和呼吸作用。敏感性分析表明，在某些假设下，氧气消耗率可能与碳供应和碳需求相匹配。我们还确定了一种垂直颗粒碳输出机制，即完整涡旋核心下沉泵。我们的分析表明，在该涡旋内450米深处，与生物重力泵相比，这种泵输出的碳约占总碳的四分之一至一半。
