Abstract. Marine particulate organic matter (POM) supports the vertical transport of organics in the oceans, and the ecology of microbes and filter feeders. POM is collected on GFF filters and quantified as particulate organic carbon (POC) and nitrogen (PON). The filtrate contains dissolved organic matter (DOM) that partly is abiotically converted into POM and can be collected on GFF filters. We filtered seawater from cultures and the pelagic ocean, after the initial sample filtration yielding the conventional POC/PON sample (POM₁), we refiltered the filtrate yielding POM₂, refiltering its filtrate we obtained POM₃ and so on till POM_i. Refiltered POM tended to the same concentration independent of the sample depth and even after a few refiltrations, independent of the original particulate organic load. POM₂/POM_i for surface water ( 1000 m) was > 1.0. We considered adsorption of DOM and bacteria that had passed through the first filter but concluded that these could not explain the high POM concentration in the filtrates. We suggest that POM in filtrates represent gels formed due to hydraulic stress during filtration. The ratio of POM₂/POM_i will partly depend on environmental conditions like turbulent energy. We suggest that the increase of POM₂/POM_i with depth is related to the lower in situ turbulent energy at greater depth. We discuss aspects of POM methodology, including problems with acidification of samples, and the wider ecological implications of our results.

中文翻译：

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将海洋溶解的有机物质快速非生物转化为地表和深水中的颗粒有机物质

摘要。海洋颗粒有机物（POM）支持海洋中有机物的垂直运输，以及微生物和滤嘴的生态。POM收集在GFF过滤器上，并量化为颗粒有机碳（POC）和氮（PON）。滤液中含有溶解的有机物（DOM），该有机物部分非生物地转化为POM，可以收集在GFF过滤器上。我们从养殖场和远洋中过滤掉海水，在初始样品过滤后生成常规POC / PON样品（POM ₁），然后对滤液进行重新过滤，生成POM ₂，对其进行重新过滤，得到POM ₃，依此类推，直到POM _i。经过重新过滤的POM趋向于相同的浓度，而与样品深度无关，甚至经过几次重新过滤后，也与原始的颗粒有机负荷无关。地表水（1000 m）的POM ₂ / POM _i > 1.0。我们考虑了通过第一个过滤器的DOM和细菌的吸附，但是得出的结论不能解释滤液中POM的高浓度。我们建议滤液中的POM代表由于过滤过程中的水力应力而形成的凝胶。POM ₂ / POM _i的比例将部分取决于环境条件，例如湍流能量。我们建议增加POM ₂ / POM _i深度越大，深度越大，原位湍流能量越低。我们讨论了POM方法论的各个方面，包括样品酸化问题以及结果的更广泛的生态意义。