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Biological or microbial carbon pump? The role of phytoplankton stoichiometry in ocean carbon sequestration

Luca Polimene, Sevrine Sailley, Darren Clark, Aditee Mitra Orcid Logo, J Icarus Allen

Journal of Plankton Research, Volume: 39, Issue: 2

Swansea University Author: Aditee Mitra Orcid Logo

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DOI (Published version): 10.1093/plankt/fbw091

Abstract

Once fixed by photosynthesis carbon becomes part of the marine food web. The fate of this carbon has two possible outcomes, it may be respired and released back to the ocean and potentially to the atmosphere as CO2 or retained in the ocean interior and/or marine sediments for extended time scales. T...

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Published in: Journal of Plankton Research
ISSN: 0142-7873 1464-3774
Published: Oxford University Press (OUP) 2017
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URI: https://cronfa.swan.ac.uk/Record/cronfa39333
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first_indexed 2018-04-06T19:34:57Z
last_indexed 2018-04-16T19:29:38Z
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spelling v2 39333 2018-04-06 Biological or microbial carbon pump? The role of phytoplankton stoichiometry in ocean carbon sequestration d5378d6d4b9d65e9fb35520ebd9a5402 0000-0001-5572-9331 Aditee Mitra Aditee Mitra true false 2018-04-06 SBI Once fixed by photosynthesis carbon becomes part of the marine food web. The fate of this carbon has two possible outcomes, it may be respired and released back to the ocean and potentially to the atmosphere as CO2 or retained in the ocean interior and/or marine sediments for extended time scales. The most important biologically mediated processes responsible for long-term carbon storage in the ocean are the biological carbon pump (BCP) and the microbial carbon pump (MCP). While acting simultaneously in the ocean, the balance between these two mechanisms is thought to vary depending on the trophic state of the environment. Using previously published formulations, we propose a modelling framework to simulate variability in the MCP:BCP ratio as a function of external nutrients. Our results suggest that the role of the MCP might become more significant under future climate change conditions where increased stratification enhances the oligotrophic nature of the surface ocean. Based on these model results, we propose a conceptual framework in which the internal stoichiometry of phytoplankton, modulating both grazing pressure and dissolved organic matter production (via phytoplankton exudation), plays a crucial role in regulating the MCP:BCP ratio. Journal Article Journal of Plankton Research 39 2 Oxford University Press (OUP) 0142-7873 1464-3774 1 3 2017 2017-03-01 10.1093/plankt/fbw091 http://dx.doi.org/10.1093/plankt/fbw091 COLLEGE NANME Biosciences COLLEGE CODE SBI Swansea University 2023-05-19T14:33:30.3498384 2018-04-06T16:05:43.6402586 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Biosciences Luca Polimene 1 Sevrine Sailley 2 Darren Clark 3 Aditee Mitra 0000-0001-5572-9331 4 J Icarus Allen 5 0039333-16042018142846.pdf 39333.pdf 2018-04-16T14:28:46.4170000 Output 706240 application/pdf Accepted Manuscript true true eng
title Biological or microbial carbon pump? The role of phytoplankton stoichiometry in ocean carbon sequestration
spellingShingle Biological or microbial carbon pump? The role of phytoplankton stoichiometry in ocean carbon sequestration
Aditee Mitra
title_short Biological or microbial carbon pump? The role of phytoplankton stoichiometry in ocean carbon sequestration
title_full Biological or microbial carbon pump? The role of phytoplankton stoichiometry in ocean carbon sequestration
title_fullStr Biological or microbial carbon pump? The role of phytoplankton stoichiometry in ocean carbon sequestration
title_full_unstemmed Biological or microbial carbon pump? The role of phytoplankton stoichiometry in ocean carbon sequestration
title_sort Biological or microbial carbon pump? The role of phytoplankton stoichiometry in ocean carbon sequestration
author_id_str_mv d5378d6d4b9d65e9fb35520ebd9a5402
author_id_fullname_str_mv d5378d6d4b9d65e9fb35520ebd9a5402_***_Aditee Mitra
author Aditee Mitra
author2 Luca Polimene
Sevrine Sailley
Darren Clark
Aditee Mitra
J Icarus Allen
format Journal article
container_title Journal of Plankton Research
container_volume 39
container_issue 2
publishDate 2017
institution Swansea University
issn 0142-7873
1464-3774
doi_str_mv 10.1093/plankt/fbw091
publisher Oxford University Press (OUP)
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Biosciences, Geography and Physics - Biosciences{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Biosciences
url http://dx.doi.org/10.1093/plankt/fbw091
document_store_str 1
active_str 0
description Once fixed by photosynthesis carbon becomes part of the marine food web. The fate of this carbon has two possible outcomes, it may be respired and released back to the ocean and potentially to the atmosphere as CO2 or retained in the ocean interior and/or marine sediments for extended time scales. The most important biologically mediated processes responsible for long-term carbon storage in the ocean are the biological carbon pump (BCP) and the microbial carbon pump (MCP). While acting simultaneously in the ocean, the balance between these two mechanisms is thought to vary depending on the trophic state of the environment. Using previously published formulations, we propose a modelling framework to simulate variability in the MCP:BCP ratio as a function of external nutrients. Our results suggest that the role of the MCP might become more significant under future climate change conditions where increased stratification enhances the oligotrophic nature of the surface ocean. Based on these model results, we propose a conceptual framework in which the internal stoichiometry of phytoplankton, modulating both grazing pressure and dissolved organic matter production (via phytoplankton exudation), plays a crucial role in regulating the MCP:BCP ratio.
published_date 2017-03-01T14:33:28Z
_version_ 1766329636639211520
score 11.012678

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