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Polysaccharide aggregation as a potential sink of marine dissolved organic carbon

机译:多糖聚集是海洋溶解有机碳的潜在汇

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The formation and sinking of biogenic particles mediate vertical mass fluxes and drive elemental cycling in the ocean(1). Whereas marine sciences have focused primarily on particle production by phytoplankton growth, particle formation by the assembly of organic macromolecules has almost been neglected(2,3). Here we show, by means of a combined experimental and modelling study, that the formation of polysaccharide particles is an important pathway to convert dissolved into particulate organic carbon during phytoplankton blooms, and can be described in terms of aggregation kinetics. Our findings suggest that aggregation processes in the ocean cascade from the molecular scale up to the size of fast-settling particles, and give new insights into the cycling and export of biogeochemical key elements such as carbon, iron and thorium.
机译:生物颗粒的形成和下沉介导垂直质量通量并驱动海洋中的元素循环(1)。海洋科学主要集中在浮游植物生长产生的颗粒上,而有机大分子组装形成的颗粒几乎被忽略了[2,3]。在这里,我们通过组合的实验和模型研究表明,多糖颗粒的形成是浮游植物开花期间将溶解的有机碳转化为颗粒状有机碳的重要途径,并且可以用聚集动力学来描述。我们的发现表明,海洋中的聚集过程从分子规模到快速沉降颗粒的大小都是级联的,并为生物地球化学关键元素(例如碳,铁和or)的循环和输出提供了新见解。

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