Depth-resolved particle associated microbial respiration in the northeast Atlantic
Atmospheric levels of carbon dioxide are tightly linked to the depth at which sinking particulate organic carbon (POC) is remineralised in the ocean. Rapid attenuation of downward POC flux typically occurs in the upper mesopelagic (top few hundred metres of the water column), with much slower loss r...
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Online Access: | https://eprints.soton.ac.uk/396640/ https://eprints.soton.ac.uk/396640/1/Manuscript_Belcher_revised_Rev5.docx https://eprints.soton.ac.uk/396640/2/bg-2016-130.pdf https://eprints.soton.ac.uk/396640/3/bg-2016-130-supplement.pdf https://eprints.soton.ac.uk/396640/4/bg-13-4927-2016.pdf https://eprints.soton.ac.uk/396640/5/bg-13-4927-2016-supplement.zip |
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ftsouthampton:oai:eprints.soton.ac.uk:396640 2023-07-30T04:05:46+02:00 Depth-resolved particle associated microbial respiration in the northeast Atlantic Belcher, Anna Iverson, Morten Giering, Sari Riou, Virginie Henson, Stephanie A. Berline, Leo Guilloux, Loic Sanders, Richard 2016-09-07 text archive https://eprints.soton.ac.uk/396640/ https://eprints.soton.ac.uk/396640/1/Manuscript_Belcher_revised_Rev5.docx https://eprints.soton.ac.uk/396640/2/bg-2016-130.pdf https://eprints.soton.ac.uk/396640/3/bg-2016-130-supplement.pdf https://eprints.soton.ac.uk/396640/4/bg-13-4927-2016.pdf https://eprints.soton.ac.uk/396640/5/bg-13-4927-2016-supplement.zip en English eng https://eprints.soton.ac.uk/396640/1/Manuscript_Belcher_revised_Rev5.docx https://eprints.soton.ac.uk/396640/2/bg-2016-130.pdf https://eprints.soton.ac.uk/396640/3/bg-2016-130-supplement.pdf https://eprints.soton.ac.uk/396640/4/bg-13-4927-2016.pdf https://eprints.soton.ac.uk/396640/5/bg-13-4927-2016-supplement.zip Belcher, Anna, Iverson, Morten, Giering, Sari, Riou, Virginie, Henson, Stephanie A., Berline, Leo, Guilloux, Loic and Sanders, Richard (2016) Depth-resolved particle associated microbial respiration in the northeast Atlantic. Biogeosciences, 13 (17), 4927-4943. (doi:10.5194/bg-2016-130 <http://dx.doi.org/10.5194/bg-2016-130>). other Article PeerReviewed 2016 ftsouthampton https://doi.org/10.5194/bg-2016-130 2023-07-09T22:08:38Z Atmospheric levels of carbon dioxide are tightly linked to the depth at which sinking particulate organic carbon (POC) is remineralised in the ocean. Rapid attenuation of downward POC flux typically occurs in the upper mesopelagic (top few hundred metres of the water column), with much slower loss rates deeper in the ocean. Currently, we lack understanding of the processes that drive POC attenuation, resulting in large uncertainties in the mesopelagic carbon budget. Attempts to balance the POC supply to the mesopelagic with respiration by zooplankton and microbes rarely succeed. Where a balance has been found, depth-resolved estimates reveal large compensating imbalances in the upper and lower mesopelagic. In particular, it has been suggested that respiration by free-living microbes and zooplankton in the upper mesopelagic are too low to explain the observed flux attenuation of POC within this layer. We test the hypothesis that particle-associated microbes contribute significantly to community respiration in the mesopelagic, measuring particle-associated microbial respiration of POC in the northeast Atlantic through shipboard measurements on individual marine snow aggregates collected at depth (36–500?m). We find very low rates of both absolute and carbon-specific particle-associated microbial respiration (<?3?%?d?1), suggesting that this term cannot solve imbalances in the upper mesopelagic POC budget. The relative importance of particle-associated microbial respiration increases with depth, accounting for up to 33?% of POC loss in the mid-mesopelagic (128–500?m). We suggest that POC attenuation in the upper mesopelagic (36–128?m) is driven by the transformation of large, fast-sinking particles to smaller, slow-sinking and suspended particles via processes such as zooplankton fragmentation and solubilisation, and that this shift to non-sinking POC may help to explain imbalances in the mesopelagic carbon budget. Article in Journal/Newspaper Northeast Atlantic University of Southampton: e-Prints Soton |
institution |
Open Polar |
collection |
University of Southampton: e-Prints Soton |
op_collection_id |
ftsouthampton |
language |
English |
description |
Atmospheric levels of carbon dioxide are tightly linked to the depth at which sinking particulate organic carbon (POC) is remineralised in the ocean. Rapid attenuation of downward POC flux typically occurs in the upper mesopelagic (top few hundred metres of the water column), with much slower loss rates deeper in the ocean. Currently, we lack understanding of the processes that drive POC attenuation, resulting in large uncertainties in the mesopelagic carbon budget. Attempts to balance the POC supply to the mesopelagic with respiration by zooplankton and microbes rarely succeed. Where a balance has been found, depth-resolved estimates reveal large compensating imbalances in the upper and lower mesopelagic. In particular, it has been suggested that respiration by free-living microbes and zooplankton in the upper mesopelagic are too low to explain the observed flux attenuation of POC within this layer. We test the hypothesis that particle-associated microbes contribute significantly to community respiration in the mesopelagic, measuring particle-associated microbial respiration of POC in the northeast Atlantic through shipboard measurements on individual marine snow aggregates collected at depth (36–500?m). We find very low rates of both absolute and carbon-specific particle-associated microbial respiration (<?3?%?d?1), suggesting that this term cannot solve imbalances in the upper mesopelagic POC budget. The relative importance of particle-associated microbial respiration increases with depth, accounting for up to 33?% of POC loss in the mid-mesopelagic (128–500?m). We suggest that POC attenuation in the upper mesopelagic (36–128?m) is driven by the transformation of large, fast-sinking particles to smaller, slow-sinking and suspended particles via processes such as zooplankton fragmentation and solubilisation, and that this shift to non-sinking POC may help to explain imbalances in the mesopelagic carbon budget. |
format |
Article in Journal/Newspaper |
author |
Belcher, Anna Iverson, Morten Giering, Sari Riou, Virginie Henson, Stephanie A. Berline, Leo Guilloux, Loic Sanders, Richard |
spellingShingle |
Belcher, Anna Iverson, Morten Giering, Sari Riou, Virginie Henson, Stephanie A. Berline, Leo Guilloux, Loic Sanders, Richard Depth-resolved particle associated microbial respiration in the northeast Atlantic |
author_facet |
Belcher, Anna Iverson, Morten Giering, Sari Riou, Virginie Henson, Stephanie A. Berline, Leo Guilloux, Loic Sanders, Richard |
author_sort |
Belcher, Anna |
title |
Depth-resolved particle associated microbial respiration in the northeast Atlantic |
title_short |
Depth-resolved particle associated microbial respiration in the northeast Atlantic |
title_full |
Depth-resolved particle associated microbial respiration in the northeast Atlantic |
title_fullStr |
Depth-resolved particle associated microbial respiration in the northeast Atlantic |
title_full_unstemmed |
Depth-resolved particle associated microbial respiration in the northeast Atlantic |
title_sort |
depth-resolved particle associated microbial respiration in the northeast atlantic |
publishDate |
2016 |
url |
https://eprints.soton.ac.uk/396640/ https://eprints.soton.ac.uk/396640/1/Manuscript_Belcher_revised_Rev5.docx https://eprints.soton.ac.uk/396640/2/bg-2016-130.pdf https://eprints.soton.ac.uk/396640/3/bg-2016-130-supplement.pdf https://eprints.soton.ac.uk/396640/4/bg-13-4927-2016.pdf https://eprints.soton.ac.uk/396640/5/bg-13-4927-2016-supplement.zip |
genre |
Northeast Atlantic |
genre_facet |
Northeast Atlantic |
op_relation |
https://eprints.soton.ac.uk/396640/1/Manuscript_Belcher_revised_Rev5.docx https://eprints.soton.ac.uk/396640/2/bg-2016-130.pdf https://eprints.soton.ac.uk/396640/3/bg-2016-130-supplement.pdf https://eprints.soton.ac.uk/396640/4/bg-13-4927-2016.pdf https://eprints.soton.ac.uk/396640/5/bg-13-4927-2016-supplement.zip Belcher, Anna, Iverson, Morten, Giering, Sari, Riou, Virginie, Henson, Stephanie A., Berline, Leo, Guilloux, Loic and Sanders, Richard (2016) Depth-resolved particle associated microbial respiration in the northeast Atlantic. Biogeosciences, 13 (17), 4927-4943. (doi:10.5194/bg-2016-130 <http://dx.doi.org/10.5194/bg-2016-130>). |
op_rights |
other |
op_doi |
https://doi.org/10.5194/bg-2016-130 |
_version_ |
1772817905971363840 |