Oxygen in Marine and Estuarine Systems

A special issue of Journal of Marine Science and Engineering (ISSN 2077-1312). This special issue belongs to the section "Chemical Oceanography".

Deadline for manuscript submissions: closed (31 December 2021) | Viewed by 4613

Special Issue Editor


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Guest Editor
Tallinn University of Technology, Tallinn, Estonia
Interests: circulation; stratification; physical and biogeochemical fluxes; deoxygenation

Special Issue Information

Dear Colleagues,

Oxygen concentration is one of the key factors that make life in oceans possible. Ocean deoxygenation has been reported in recent decades. Expansion of low-oxygen zones both in the open ocean and coastal areas has been observed. The distribution of oxygen in the ocean is dependent on various physical, biogeochemical, and biological processes. Anthropogenic activities, such as eutrophication driven by excess nutrients, cause a decrease in the oxygen content of the oceans. The processes and pathways affecting oxygen concentration are not fully understood. This Special Issue is open to submissions related to the topic of oxygen in marine systems. Particularly, manuscripts on the following subjects are encouraged:

  • Long-term changes in ocean oxygen concentrations;
  • Effects of deoxygenation on marine life;
  • Physical, biogeochemical, and/or biological drivers controlling oxygen distribution;
  • Effects of climate change on oxygen depletion;
  • The role of anthropogenic activities in oxygen depletion;
  • Benthic biogeochemical fluxes under variable oxygen conditions;
  • Future predictions of oxygen content in the oceans.

Dr. Taavi Liblik
Guest Editor

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Keywords

  • Oxygen minimum zones
  • Coastal hypoxia
  • Anoxia in marine systems
  • Deoxygenation
  • Benthic fluxes
  • Eutrophication
  • Ocean ventilation

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Published Papers (1 paper)

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Research

30 pages, 4018 KiB  
Article
A Multi-Proxy Approach to Reconstruct Hypoxia on the NW Black Sea Shelf over the Holocene
by Sarah Robinet, Alice Ofélia Matossian, Arthur Capet, Lei Chou, François Fontaine, Marilaure Grégoire, Gilles Lepoint, Natalia Piotrowska, Audrey Plante, Olaya Román Romín and Nathalie Fagel
J. Mar. Sci. Eng. 2022, 10(3), 319; https://doi.org/10.3390/jmse10030319 - 23 Feb 2022
Cited by 2 | Viewed by 3784
Abstract
Coastal hypoxia is a worldwide concern. Even though seasonal hypoxia has been reported on the northwestern Black Sea shelf since the 1970s, little is known about oxygenation in this area over the Holocene. With a multiproxy approach, this work aimed to detect potential [...] Read more.
Coastal hypoxia is a worldwide concern. Even though seasonal hypoxia has been reported on the northwestern Black Sea shelf since the 1970s, little is known about oxygenation in this area over the Holocene. With a multiproxy approach, this work aimed to detect potential hypoxic events in two gravity cores. Our results demonstrate that the most common proxies of hypoxia are irrelevant for the Black Sea coastal environment. For instance, the Ammonia-Elphidium index appears to be inappropriate. We assume a salinity bias due to the influence of freshwater inputs. Likely, the redox sensitivity of vanadium is obscured by the dominant supply of detrital elements. However, the size distribution of framboidal pyrites gives clear indications of the oxygenation of the water column. Indeed, the absence of framboidal pyrites in the core located at the Danube mouth suggests permanent oxic conditions over the last 2 ka. On the contrary, in the core located in the Odessa Bay, the two observed ranges of pyrite sizes evidence an alternation between anoxic (mean diameter 3–6 ± 1–2 µm) and hypoxic or oxic (mean diameter 6–10 ± 3–5 µm) conditions in bottom waters over the last 7 ka. Therefore, this proxy reveals different oxygenation levels for these proximal sites. Full article
(This article belongs to the Special Issue Oxygen in Marine and Estuarine Systems)
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