the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Rapid abiotic transformation of marine dissolved organic material to particulate organic material in surface and deep waters
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 POMi. 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/POMi for surface water (< 100 m) was about 0.1 and for deep 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/POMi will partly depend on environmental conditions like turbulent energy. We suggest that the increase of POM2/POMi 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.
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Preprint
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Supplement
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This preprint has been withdrawn.
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Interactive discussion
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RC1: 'Review for bg-2020-291', Anonymous Referee #1, 16 Sep 2020
- AC1: 'response to reviewer 1', Helmut Maske, 30 Oct 2020
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RC2: 'measurement of particulate organic matter', Anonymous Referee #2, 20 Sep 2020
- AC2: 'Response to reviewer 2', Helmut Maske, 30 Oct 2020
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RC3: 'Interactive comment on “Rapid abiotic transformation of marine dissolved organic material to particulate organic material in surface and deep waters”', Anonymous Referee #3, 21 Sep 2020
- AC3: 'response to reviewer 3', Helmut Maske, 30 Oct 2020
Interactive discussion
-
RC1: 'Review for bg-2020-291', Anonymous Referee #1, 16 Sep 2020
- AC1: 'response to reviewer 1', Helmut Maske, 30 Oct 2020
-
RC2: 'measurement of particulate organic matter', Anonymous Referee #2, 20 Sep 2020
- AC2: 'Response to reviewer 2', Helmut Maske, 30 Oct 2020
-
RC3: 'Interactive comment on “Rapid abiotic transformation of marine dissolved organic material to particulate organic material in surface and deep waters”', Anonymous Referee #3, 21 Sep 2020
- AC3: 'response to reviewer 3', Helmut Maske, 30 Oct 2020
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Paola Valdes Villaverde
Cesar Almeda Jauregui
Helmut Maske
This preprint has been withdrawn.
- Preprint
(2026 KB) - Metadata XML
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Supplement
(71 KB) - BibTeX
- EndNote