Dissolved organic matter in abyssal sediments: Core recovery artifacts
We report measurements of pore‐water dissolved organic carbon (DOC), dissolved organic nitrogen, total dissolved carbohydrates, dissolved free monosaccharides, and ammonium in recovered deep‐sea sediments from the Porcupine Abyssal Plain (PAP), Northeast Atlantic. There were distinct maxima close to...
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crwiley:10.4319/lo.2007.52.1.0019 2024-09-15T18:25:25+00:00 Dissolved organic matter in abyssal sediments: Core recovery artifacts Hall, Per O. J. Brunnegård, Jenny Hulthe, Gustaf Martin, William R. Stahl, Henrik Tengberg, Anders 2007 http://dx.doi.org/10.4319/lo.2007.52.1.0019 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.4319%2Flo.2007.52.1.0019 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.4319/lo.2007.52.1.0019 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Limnology and Oceanography volume 52, issue 1, page 19-31 ISSN 0024-3590 1939-5590 journal-article 2007 crwiley https://doi.org/10.4319/lo.2007.52.1.0019 2024-09-03T04:21:42Z We report measurements of pore‐water dissolved organic carbon (DOC), dissolved organic nitrogen, total dissolved carbohydrates, dissolved free monosaccharides, and ammonium in recovered deep‐sea sediments from the Porcupine Abyssal Plain (PAP), Northeast Atlantic. There were distinct maxima close to the sediment‐water interface of these constituents at all times of the year. The very high diffusive effluxes calculated from these porewater distributions were not compatible with simultaneous sediment trap measurements of particulate organic carbon, nitrogen, and carbohydrate fluxes toward the seafloor. Effluxes calculated from pore‐water DOC distributions in recovered cores from another Atlantic deep‐sea site, showing almost identical maxima as those at PAP, were more than an order of magnitude greater than simultaneous in situ chamber DOC flux measurements. We suggest that the dissolved organic matter maxima are predominantly artifacts induced by lysis of, or leakage from, mainly bacterial biomass resulting from decompression and/or warming during recovery of the sediment cores from the abyssal seafloor. Temperature elevation during core recovery from the abyss gives a N 2 saturation of about 150%, and the combined effect of warming and decompression results in a CO 2 saturation of about 135%, which together plausibly are associated with bubble formation creating cell bursting. Previous estimates of microbial biomass in abyssal sediments may be underestimates because of the difficulty of counting lysed bacterial cells. Since exoenzymes are inducible, previous measurements of their activities in recovered abyssal sediments may be overestimates. Article in Journal/Newspaper Northeast Atlantic Wiley Online Library Limnology and Oceanography 52 1 19 31 |
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Wiley Online Library |
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English |
description |
We report measurements of pore‐water dissolved organic carbon (DOC), dissolved organic nitrogen, total dissolved carbohydrates, dissolved free monosaccharides, and ammonium in recovered deep‐sea sediments from the Porcupine Abyssal Plain (PAP), Northeast Atlantic. There were distinct maxima close to the sediment‐water interface of these constituents at all times of the year. The very high diffusive effluxes calculated from these porewater distributions were not compatible with simultaneous sediment trap measurements of particulate organic carbon, nitrogen, and carbohydrate fluxes toward the seafloor. Effluxes calculated from pore‐water DOC distributions in recovered cores from another Atlantic deep‐sea site, showing almost identical maxima as those at PAP, were more than an order of magnitude greater than simultaneous in situ chamber DOC flux measurements. We suggest that the dissolved organic matter maxima are predominantly artifacts induced by lysis of, or leakage from, mainly bacterial biomass resulting from decompression and/or warming during recovery of the sediment cores from the abyssal seafloor. Temperature elevation during core recovery from the abyss gives a N 2 saturation of about 150%, and the combined effect of warming and decompression results in a CO 2 saturation of about 135%, which together plausibly are associated with bubble formation creating cell bursting. Previous estimates of microbial biomass in abyssal sediments may be underestimates because of the difficulty of counting lysed bacterial cells. Since exoenzymes are inducible, previous measurements of their activities in recovered abyssal sediments may be overestimates. |
format |
Article in Journal/Newspaper |
author |
Hall, Per O. J. Brunnegård, Jenny Hulthe, Gustaf Martin, William R. Stahl, Henrik Tengberg, Anders |
spellingShingle |
Hall, Per O. J. Brunnegård, Jenny Hulthe, Gustaf Martin, William R. Stahl, Henrik Tengberg, Anders Dissolved organic matter in abyssal sediments: Core recovery artifacts |
author_facet |
Hall, Per O. J. Brunnegård, Jenny Hulthe, Gustaf Martin, William R. Stahl, Henrik Tengberg, Anders |
author_sort |
Hall, Per O. J. |
title |
Dissolved organic matter in abyssal sediments: Core recovery artifacts |
title_short |
Dissolved organic matter in abyssal sediments: Core recovery artifacts |
title_full |
Dissolved organic matter in abyssal sediments: Core recovery artifacts |
title_fullStr |
Dissolved organic matter in abyssal sediments: Core recovery artifacts |
title_full_unstemmed |
Dissolved organic matter in abyssal sediments: Core recovery artifacts |
title_sort |
dissolved organic matter in abyssal sediments: core recovery artifacts |
publisher |
Wiley |
publishDate |
2007 |
url |
http://dx.doi.org/10.4319/lo.2007.52.1.0019 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.4319%2Flo.2007.52.1.0019 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.4319/lo.2007.52.1.0019 |
genre |
Northeast Atlantic |
genre_facet |
Northeast Atlantic |
op_source |
Limnology and Oceanography volume 52, issue 1, page 19-31 ISSN 0024-3590 1939-5590 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.4319/lo.2007.52.1.0019 |
container_title |
Limnology and Oceanography |
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52 |
container_issue |
1 |
container_start_page |
19 |
op_container_end_page |
31 |
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1810465934063697920 |