The export of particulate organic carbon (POC) from surface waters to the ocean interior via the biological carbon pump is largely envisioned as a vertical process. However, several lines of evidence suggest that lateral supply of aged organic matter hosted on lithogenic particles derived from sediment resuspension may also be a significant process. Despite its potential importance, lateral POC supply has not been systematically examined on a global scale. Here, we assess the contribution of resuspended sediment to sinking particulate matter in the ocean using literature data of sediment trap studies. Proportions and absolute fluxes of lithogenic material at 158 sites and available radiocarbon contents are compiled to develop a global‐scale assessment. We find that lithogenic material accounts for 25 ± 20% of sinking particulate matter, comprising a mean flux of 67 mg m⁻²d⁻¹. Lithogenic material flux generally decreased with increasing distance from the coast and with increasing height above the seafloor. The Δ¹⁴C values of POC exhibited a linear relationship with a wt/wt ratio of lithogenic material to POC. Loadings of aged POC to lithogenic material obtained from this relationship were similar to or higher than POC content of the surface sediment in the vicinity. Based on this relationship, and the global mean of lithogenic material content of sinking particulate matter, we calculate that aged POC from sediment resuspension comprises 0.2–0.7% of sinking particles and 4–11% of sinking POC intercepted by sediment traps.

中文翻译：

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横向颗粒供应是海洋碳循环的关键载体

通过生物碳泵将地表水中的颗粒有机碳（POC）出口到海洋内部的过程很大程度上是垂直的。但是，有几条证据表明，从沉积物再悬浮中获得的生石颗粒上的陈化有机物的侧向供应可能也是一个重要过程。尽管具有潜在的重要性，但尚未在全球范围内系统地检查过境POC供应。在这里，我们使用沉积物陷阱研究的文献数据评估悬浮的沉积物对沉入海洋中的颗粒物的贡献。编制了158个地点的成岩物质的比例和绝对通量以及可用的放射性碳含量，以进行全球规模的评估。我们发现，致石物质占下沉颗粒物的25±20％，^-2 d ^-1。成岩物质通量通常随着距海岸的距离增加以及海平面以上的高度增加而降低。的Δ ¹⁴ POC的C值表现出与到POC重量/重量致石材料的比率呈线性关系。从这种关系获得的老化的POC对成岩材料的负载与附近表面沉积物的POC含量相似或更高。基于这种关系，以及下沉颗粒物的成岩物质含量的全球平均值，我们计算出来自沉积物再悬浮的老化POC包括下沉颗粒物的0.2–0.7％和下沉POC的4–11％。