Dissolved organic matter in abyssal sediments:Core recovery artefacts.
We report measurements of pore-water dissolved organic carbon (DOC), dissolved organic nitrogen, total dissolved carbohydrates, dissolved free mono saccharides, and ammonium in recovered deep-sea sediments from the Porcupine Abyssal Plain (PAP), Northeast Atlantic. There were distinct maxima close t...
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ftuhipublicatio:oai:pure.atira.dk:publications/87c2c0ff-85aa-407a-abb9-3341b8e718e5 2024-05-19T07:45:17+00:00 Dissolved organic matter in abyssal sediments:Core recovery artefacts. Hall, Per O J Brunnegard, J Hulthe, G Martin, W R Stahl, Henrik Tengberg, A 2007 https://pure.uhi.ac.uk/en/publications/87c2c0ff-85aa-407a-abb9-3341b8e718e5 eng eng https://pure.uhi.ac.uk/en/publications/87c2c0ff-85aa-407a-abb9-3341b8e718e5 info:eu-repo/semantics/restrictedAccess Hall , P O J , Brunnegard , J , Hulthe , G , Martin , W R , Stahl , H & Tengberg , A 2007 , ' Dissolved organic matter in abyssal sediments : Core recovery artefacts. ' , LIMNOL OCEANOGR , no. 2 , pp. 19-31 . SOUTH-ATLANTIC IN-SITU CONTINENTAL-MARGIN SEDIMENTS PEAT SAMPLES NE ATLANTIC DEEP-SEA SEDIMENTS BENTHIC RESPONSE PORE-WATER Limnology Oceanography NORTH-ATLANTIC HIGH-TEMPERATURE OXIDATION article 2007 ftuhipublicatio 2024-04-25T00:21:46Z We report measurements of pore-water dissolved organic carbon (DOC), dissolved organic nitrogen, total dissolved carbohydrates, dissolved free mono saccharides, 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 pore-water 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 CO2 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 North Atlantic Northeast Atlantic University of the Highlands and Islands: Research Database of UHI |
institution |
Open Polar |
collection |
University of the Highlands and Islands: Research Database of UHI |
op_collection_id |
ftuhipublicatio |
language |
English |
topic |
SOUTH-ATLANTIC IN-SITU CONTINENTAL-MARGIN SEDIMENTS PEAT SAMPLES NE ATLANTIC DEEP-SEA SEDIMENTS BENTHIC RESPONSE PORE-WATER Limnology Oceanography NORTH-ATLANTIC HIGH-TEMPERATURE OXIDATION |
spellingShingle |
SOUTH-ATLANTIC IN-SITU CONTINENTAL-MARGIN SEDIMENTS PEAT SAMPLES NE ATLANTIC DEEP-SEA SEDIMENTS BENTHIC RESPONSE PORE-WATER Limnology Oceanography NORTH-ATLANTIC HIGH-TEMPERATURE OXIDATION Hall, Per O J Brunnegard, J Hulthe, G Martin, W R Stahl, Henrik Tengberg, A Dissolved organic matter in abyssal sediments:Core recovery artefacts. |
topic_facet |
SOUTH-ATLANTIC IN-SITU CONTINENTAL-MARGIN SEDIMENTS PEAT SAMPLES NE ATLANTIC DEEP-SEA SEDIMENTS BENTHIC RESPONSE PORE-WATER Limnology Oceanography NORTH-ATLANTIC HIGH-TEMPERATURE OXIDATION |
description |
We report measurements of pore-water dissolved organic carbon (DOC), dissolved organic nitrogen, total dissolved carbohydrates, dissolved free mono saccharides, 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 pore-water 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 CO2 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 Brunnegard, J Hulthe, G Martin, W R Stahl, Henrik Tengberg, A |
author_facet |
Hall, Per O J Brunnegard, J Hulthe, G Martin, W R Stahl, Henrik Tengberg, A |
author_sort |
Hall, Per O J |
title |
Dissolved organic matter in abyssal sediments:Core recovery artefacts. |
title_short |
Dissolved organic matter in abyssal sediments:Core recovery artefacts. |
title_full |
Dissolved organic matter in abyssal sediments:Core recovery artefacts. |
title_fullStr |
Dissolved organic matter in abyssal sediments:Core recovery artefacts. |
title_full_unstemmed |
Dissolved organic matter in abyssal sediments:Core recovery artefacts. |
title_sort |
dissolved organic matter in abyssal sediments:core recovery artefacts. |
publishDate |
2007 |
url |
https://pure.uhi.ac.uk/en/publications/87c2c0ff-85aa-407a-abb9-3341b8e718e5 |
genre |
North Atlantic Northeast Atlantic |
genre_facet |
North Atlantic Northeast Atlantic |
op_source |
Hall , P O J , Brunnegard , J , Hulthe , G , Martin , W R , Stahl , H & Tengberg , A 2007 , ' Dissolved organic matter in abyssal sediments : Core recovery artefacts. ' , LIMNOL OCEANOGR , no. 2 , pp. 19-31 . |
op_relation |
https://pure.uhi.ac.uk/en/publications/87c2c0ff-85aa-407a-abb9-3341b8e718e5 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
_version_ |
1799485284170072064 |