Hydrostatic pressure induces strong leakage of dissolved organic matter from "marine snow" particles.
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| Main Authors: | , , , , , , , |
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| Format: | Artículo científico |
| Language: | en |
| Published: |
Science advances
2026
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| _version_ | 1868266090049568769 |
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| author | Stief, Peter Niggemann, Jutta Bligh, Margot Buck-Wiese, Hagen Wünsch, Urban Steinke, Michael Hehemann, Jan-Hendrik Glud, Ronnie N |
| author_facet | Stief, Peter Niggemann, Jutta Bligh, Margot Buck-Wiese, Hagen Wünsch, Urban Steinke, Michael Hehemann, Jan-Hendrik Glud, Ronnie N Stief, Peter Niggemann, Jutta Bligh, Margot Buck-Wiese, Hagen Wünsch, Urban Steinke, Michael Hehemann, Jan-Hendrik Glud, Ronnie N |
| collection | PubMed - marine biology |
| contents | Hydrostatic pressure induces strong leakage of dissolved organic matter from "marine snow" particles. Stief, Peter Niggemann, Jutta Bligh, Margot Buck-Wiese, Hagen Wünsch, Urban Steinke, Michael Hehemann, Jan-Hendrik Glud, Ronnie N Marine snow forms at the ocean surface, sinks to depth, and ultimately enables carbon sequestration in the seabed. Fast-sinking marine snow particles, such as diatom aggregates, encounter a rapid increase in hydrostatic pressure during their descent. Using incubations in rotating pressure tanks, we found that pressure levels corresponding to 2- to 6-kilometer water depth induce leakage of dissolved organic matter (DOM) from diatom aggregates equivalent to ~50% of their initial carbon contents. The leaked DOM proved to be diatom-derived and changed the amount and composition of DOM in the surrounding seawater substantially. Ultrahigh-resolution mass spectrometry, high protein-like fluorescence, and low carbon:nitrogen ratios classified the leaked DOM as labile. The bioavailability of leaked DOM was demonstrated by its rapid utilization by a pelagic microbial community, leaving mainly recalcitrant DOM behind. Pressure-induced DOM leakage likely weakens the gravitational "biological carbon pump" and supplies labile DOM to the pelagic microbiome of the deep ocean. |
| format | Artículo científico |
| id | pubmed_41637499 |
| institution | PubMed |
| language | en |
| publishDate | 2026 |
| publisher | Science advances |
| record_format | pubmed |
| spellingShingle | Hydrostatic pressure induces strong leakage of dissolved organic matter from "marine snow" particles. Stief, Peter Niggemann, Jutta Bligh, Margot Buck-Wiese, Hagen Wünsch, Urban Steinke, Michael Hehemann, Jan-Hendrik Glud, Ronnie N Hydrostatic pressure induces strong leakage of dissolved organic matter from "marine snow" particles. Stief, Peter Niggemann, Jutta Bligh, Margot Buck-Wiese, Hagen Wünsch, Urban Steinke, Michael Hehemann, Jan-Hendrik Glud, Ronnie N Marine snow forms at the ocean surface, sinks to depth, and ultimately enables carbon sequestration in the seabed. Fast-sinking marine snow particles, such as diatom aggregates, encounter a rapid increase in hydrostatic pressure during their descent. Using incubations in rotating pressure tanks, we found that pressure levels corresponding to 2- to 6-kilometer water depth induce leakage of dissolved organic matter (DOM) from diatom aggregates equivalent to ~50% of their initial carbon contents. The leaked DOM proved to be diatom-derived and changed the amount and composition of DOM in the surrounding seawater substantially. Ultrahigh-resolution mass spectrometry, high protein-like fluorescence, and low carbon:nitrogen ratios classified the leaked DOM as labile. The bioavailability of leaked DOM was demonstrated by its rapid utilization by a pelagic microbial community, leaving mainly recalcitrant DOM behind. Pressure-induced DOM leakage likely weakens the gravitational "biological carbon pump" and supplies labile DOM to the pelagic microbiome of the deep ocean. |
| title | Hydrostatic pressure induces strong leakage of dissolved organic matter from "marine snow" particles. |
| url | https://pubmed.ncbi.nlm.nih.gov/41637499/ |