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  Carbon release and transformation from coastal peat deposits controlled by submarine groundwater discharge: a column experiment study

Kreuzburg, M., Rezanezhad, F., Milojevic, T., Voss, M., Gosch, L., Liebner, S., Van Cappellen, P., Rehder, G. (2020): Carbon release and transformation from coastal peat deposits controlled by submarine groundwater discharge: a column experiment study. - Limnology and Oceanography, 65, 5, 1116-1135.
https://doi.org/10.1002/lno.11438

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5001279 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5001279_7
Genre: Journal Article

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Kreuzburg, Matthias1, Author
Rezanezhad, Fereidoun1, Author
Milojevic, Tatjana1, Author
Voss, Maren1, Author
Gosch, Lennart1, Author
Liebner, Susanne2, Author              
Van Cappellen, Philippe1, Author
Rehder, Gregor1, Author
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1External Organizations, ou_persistent22              
23.7 Geomicrobiology, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_146043              

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 Abstract: Although the majority of coastal sediments consist of sandy material, in some areas marine ingression caused the submergence of terrestrial carbon‐rich peat soils. This affects the coastal carbon balance, as peat represents a potential carbon source. We performed a column experiment to better understand the coupled flow and biogeochemical processes governing carbon transformations in submerged peat under coastal fresh groundwater (GW) discharge and brackish water intrusion. The columns contained naturally layered sediments with and without peat (organic carbon content in peat 39 ± 14 wt%), alternately supplied with oxygen‐rich brackish water from above and oxygen‐poor, low‐saline GW from below. The low‐saline GW discharge through the peat significantly increased the release and ascent of dissolved organic carbon (DOC) from the peat (δ13CDOC − 26.9‰ to − 27.7‰), which was accompanied by the production of dissolved inorganic carbon (DIC) and emission of carbon dioxide (CO2), implying DOC mineralization. Oxygen respiration, sulfate (urn:x-wiley:00243590:media:lno11438:lno11438-math-0001) reduction, and methane (CH4) formation were differently pronounced in the sediments and were accompanied with higher microbial abundances in peat compared to sand with urn:x-wiley:00243590:media:lno11438:lno11438-math-0002‐reducing bacteria clearly dominating methanogens. With decreasing salinity and urn:x-wiley:00243590:media:lno11438:lno11438-math-0003 concentrations, CH4 emission rates increased from 16.5 to 77.3 μmol m−2 d−1 during a 14‐day, low‐saline GW discharge phase. In contrast, oxygenated brackish water intrusion resulted in lower DOC and DIC pore water concentrations and significantly lower CH4 and CO2 emissions. Our study illustrates the strong dependence of carbon cycling in shallow coastal areas with submerged peat deposits on the flow and mixing dynamics within the subterranean estuary.

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 Dates: 2020-03-202020
 Publication Status: Finally published
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 Identifiers: DOI: 10.1002/lno.11438
GFZPOF: p3 PT3 Earth Surface and Climate Interactions
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Title: Limnology and Oceanography
Source Genre: Journal, SCI, Scopus
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Pages: - Volume / Issue: 65 (5) Sequence Number: - Start / End Page: 1116 - 1135 Identifier: CoNE: https://gfzpublic.gfz-potsdam.de/cone/journals/resource/journals325
Publisher: Wiley