2022
DOI: 10.1029/2021jc018401
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Benthic Carbon Remineralization and Iron Cycling in Relation to Sea Ice Cover Along the Eastern Continental Shelf of the Antarctic Peninsula

Abstract: Rapid and profound climatic and environmental changes have been predicted for the Antarctic Peninsula with so far unknown impact on the biogeochemistry of the continental shelves. In this study, we investigate benthic carbon sedimentation, remineralization and iron cycling using sediment cores retrieved on a 400 mile transect with contrasting sea ice conditions along the eastern shelf of the Antarctic Peninsula. Sediments at comparable water depths of 330–450 m showed sedimentation and remineralization rates o… Show more

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Cited by 12 publications
(25 citation statements)
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“…We can also conclude that, given the broad oxic zone in both of these sedimentary environments and the inferred low flux of reductants, such as Fe 2+ , these sediments are unlikely a source of diffusive iron supply to the iron-limited Southern Ocean. The broad oxic zone measured in this study is at least $ 10 cm thicker than marine sediments on the eastern shelf of the Antarctic Peninsula (Baloza et al 2022). Baloza et al (2022) show that these sediments with deep oxygen penetration depths (at least 4 cm) have minimal fluxes of dissolved Fe to the water column and are not significant sources of Fe to the Southern Ocean water column.…”
Section: Discussionmentioning
confidence: 47%
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“…We can also conclude that, given the broad oxic zone in both of these sedimentary environments and the inferred low flux of reductants, such as Fe 2+ , these sediments are unlikely a source of diffusive iron supply to the iron-limited Southern Ocean. The broad oxic zone measured in this study is at least $ 10 cm thicker than marine sediments on the eastern shelf of the Antarctic Peninsula (Baloza et al 2022). Baloza et al (2022) show that these sediments with deep oxygen penetration depths (at least 4 cm) have minimal fluxes of dissolved Fe to the water column and are not significant sources of Fe to the Southern Ocean water column.…”
Section: Discussionmentioning
confidence: 47%
“…Our Whillans Grounding Zone oxygen profiles indicate that most of the sedimentary oxygen consumption takes place in the upper 2–4 cm, similar to other Southern Ocean sites where up to 99% of the total O 2 consumption occurs in the upper 2–4 cm (Jørgensen et al 2022). Our measurements show that benthic habitats beneath ice shelves and isolated from the ice shelf edge are oligotrophic and would experience significant changes in biogeochemical function with ice sheet collapse leading to higher exports of particulate organic carbon or marginal sea ice conditions (Ingels et al 2021; Baloza et al 2022). Sedimentary oxygen consumption values from Mercer Subglacial Lake are lower than other oligotrophic or high Arctic lakes.…”
Section: Discussionmentioning
confidence: 85%
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“…The significant role of microbial Fe(III) reduction in OM degradation has been suggested by many researchers (e.g., Canfield et al, 1993;Van Cappellen and Wang, 1996;Wunder et al, 2021;Baloza et al, 2022). Here we focused on the less crystallized, easily reducible Fe(III) (extracted with 0.5 M HCl) and explored its role as electron acceptor under advective flow in coastal sands characterized by variable redox conditions.…”
Section: Iron As Electron Acceptor In Sandsmentioning
confidence: 97%