Organic matter degradation causes enrichment of organic pollutants in hadal sediments

Sobek, Anna (author): Stockholms universitet,Institutionen för miljövetenskap

Abel, Sebastian (author): Stockholms universitet,Institutionen för miljövetenskap

Sanei, Hamed (author)

Bonaglia, Stefano, 1983 (author): Gothenburg University,Göteborgs universitet,Institutionen för marina vetenskaper,Department of marine sciences

Li, Zhe, 1987- (author): Stockholms universitet,Institutionen för miljövetenskap

Horlitz, Gisela (author): Stockholms universitet,Institutionen för miljövetenskap

Rudra, Arka (author)

Oguri, Kazumasa (author)

Glud, Ronnie N. (author)

(creator_code:org_t)

Related links:: https://doi.org/10.1...; show more...; https://gup.ub.gu.se...; https://doi.org/10.1...; https://urn.kb.se/re...; show less...

Abstract Subject headings

Burial of persistent organic pollutants (POPs) such as polychlorinated biphenyls (PCBs) in deep-sea sediments contributes to 60% of their historical emissions. Yet, empirical data on their occurrence in the deep-ocean is scarce. Estimates of the deep-ocean POP sink are therefore uncertain. Hadal trenches, representing the deepest part of the ocean, are hotspots for organic carbon burial and decomposition. POPs favorably partition to organic carbon, making trenches likely significant sinks for contaminants. Here we show that PCBs occur in both hadal (7720–8085 m) and non-hadal (2560–4050 m) sediment in the Atacama Trench. PCB concentrations normalized to sediment dry weight were similar across sites while those normalized to sediment organic carbon increased exponentially as the inert organic carbon fraction of the sediment increased in degraded hadal sediments. We suggest that the unique deposition dynamics and elevated turnover of organic carbon in hadal trenches increase POP concentrations in the deepest places on Earth.

NATURVETENSKAP -- Biologi -- Ekologi (hsv//swe)
NATURAL SCIENCES -- Biological Sciences -- Ecology (hsv//eng)
NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Annan geovetenskap och miljövetenskap (hsv//swe)
NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Other Earth and Related Environmental Sciences (hsv//eng)
NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geokemi (hsv//swe)
NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geochemistry (hsv//eng)
NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geologi (hsv//swe)
NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geology (hsv//eng)
NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Miljövetenskap (hsv//swe)
NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Environmental Sciences (hsv//eng)
NATURVETENSKAP -- Geovetenskap och miljövetenskap (hsv//swe)
NATURAL SCIENCES -- Earth and Related Environmental Sciences (hsv//eng)

By the author/editor: Sobek, Anna; Abel, Sebastian; Sanei, Hamed; Bonaglia, Stefan ...; Li, Zhe, 1987-; Horlitz, Gisela; show more...; Rudra, Arka; Oguri, Kazumasa; Glud, Ronnie N.; show less...

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Earth and Relate ...; and Other Earth and ...

NATURAL SCIENCES: NATURAL SCIENCES; and Earth and Relate ...; and Geochemistry

NATURAL SCIENCES: NATURAL SCIENCES; and Earth and Relate ...; and Environmental Sc ...

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