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Near seafloor methane flux in the world's largest human-induced dead zone is regulated by sediment accumulation rate.

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Title: Near seafloor methane flux in the world's largest human-induced dead zone is regulated by sediment accumulation rate.
Authors: Ketzer, M.1 (AUTHOR) marcelo.ketzer@lnu.se, Stranne, C.2 (AUTHOR), Rahmati-Abkenar, M.1,3 (AUTHOR), Shahabi-Ghahfarokhi, S.1,4 (AUTHOR), Jaeger, L.1,5 (AUTHOR), Pivel, M.A.G.6 (AUTHOR), Josefsson, S.7 (AUTHOR), Zillén, L.7 (AUTHOR)
Source: Marine Geology. Feb2024, Vol. 468, pN.PAG-N.PAG. 1p.
Subjects: Sediments, Methane, Supply & demand, Organic compounds, Sedimentation & deposition, Sediment-water interfaces
Geographic Terms: Gulf of Mexico
Abstract: The vast oxygen-depleted area of the central Baltic Sea is the largest human-induced dead zone in the world with 70,000 km2 or approximately three times the second largest one in the Gulf of Mexico. Methane occurs in high concentrations in bottom waters (3200 nM) and sediments (30 mM), and its dynamics is better constrained for the water column, but still poorly understood on sediments. Here we show that sediment accumulation rate plays a major role in regulating the quantity of organic matter and its residence time in the sulphate reduction and methanogenesis zones and, therefore, affects methane generation, consumption, and diffusive flux in sediments near the seafloor (< 1 m). High fluxes found in high sediment accumulation rate areas and competition for substrate (organoclastic sulphate reduction vs. anaerobic oxidation of methane with sulphate), compromise the ability of the thin microbial filter to consume and prevent methane diffusion through the seafloor. • A coring campaign compared methane concentrations in sediments and bottom waters in the Baltic Proper and Bothnian Bay. • High near-seafloor methane fluxes in sediments in the Baltic Proper occur in areas with high sediment accumulation rate. • High supply of labile organic matter diminishes the ability of the sulphate reduction microbial filter to oxidise methane. • High sedimentation quickly buries organic matter below the sulphate reduction zone leaving labile material for methanogenesis. [ABSTRACT FROM AUTHOR]
Copyright of Marine Geology is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 175136284
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Near seafloor methane flux in the world&#39;s largest human-induced dead zone is regulated by sediment accumulation rate.
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  Data: &lt;searchLink fieldCode=&quot;JN&quot; term=&quot;%22Marine+Geology%22&quot;&gt;Marine Geology&lt;/searchLink&gt;. Feb2024, Vol. 468, pN.PAG-N.PAG. 1p.
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– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The vast oxygen-depleted area of the central Baltic Sea is the largest human-induced dead zone in the world with 70,000 km2 or approximately three times the second largest one in the Gulf of Mexico. Methane occurs in high concentrations in bottom waters (3200 nM) and sediments (30 mM), and its dynamics is better constrained for the water column, but still poorly understood on sediments. Here we show that sediment accumulation rate plays a major role in regulating the quantity of organic matter and its residence time in the sulphate reduction and methanogenesis zones and, therefore, affects methane generation, consumption, and diffusive flux in sediments near the seafloor (&lt; 1 m). High fluxes found in high sediment accumulation rate areas and competition for substrate (organoclastic sulphate reduction vs. anaerobic oxidation of methane with sulphate), compromise the ability of the thin microbial filter to consume and prevent methane diffusion through the seafloor. • A coring campaign compared methane concentrations in sediments and bottom waters in the Baltic Proper and Bothnian Bay. • High near-seafloor methane fluxes in sediments in the Baltic Proper occur in areas with high sediment accumulation rate. • High supply of labile organic matter diminishes the ability of the sulphate reduction microbial filter to oxidise methane. • High sedimentation quickly buries organic matter below the sulphate reduction zone leaving labile material for methanogenesis. [ABSTRACT FROM AUTHOR]
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  Data: &lt;i&gt;Copyright of Marine Geology is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder&#39;s express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.&lt;/i&gt; (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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    Identifiers:
      – Type: doi
        Value: 10.1016/j.margeo.2024.107220
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 1
        StartPage: N.PAG
    Subjects:
      – SubjectFull: Sediments
        Type: general
      – SubjectFull: Methane
        Type: general
      – SubjectFull: Supply & demand
        Type: general
      – SubjectFull: Organic compounds
        Type: general
      – SubjectFull: Sedimentation & deposition
        Type: general
      – SubjectFull: Sediment-water interfaces
        Type: general
      – SubjectFull: Gulf of Mexico
        Type: general
    Titles:
      – TitleFull: Near seafloor methane flux in the world's largest human-induced dead zone is regulated by sediment accumulation rate.
        Type: main
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            NameFull: Ketzer, M.
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            NameFull: Rahmati-Abkenar, M.
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            NameFull: Shahabi-Ghahfarokhi, S.
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            – D: 01
              M: 02
              Text: Feb2024
              Type: published
              Y: 2024
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