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Mechanisms for a nutrient-conserving carbon pump in a seasonally stratified, temperate continental shelf sea

Mechanisms for a nutrient-conserving carbon pump in a seasonally stratified, temperate continental shelf sea
Mechanisms for a nutrient-conserving carbon pump in a seasonally stratified, temperate continental shelf sea
Continental shelf seas may have a significant role in oceanic uptake and storage of carbon dioxide (CO2) from the atmosphere, through a ‘continental shelf pump’ mechanism. The northwest European continental shelf, in particular the Celtic Sea (50°N 8°W), was the target of extensive biogeochemical sampling from March 2014 to September 2015, as part of the UK Shelf Sea Biogeochemistry research programme (UK-SSB). Here, we use the UK-SSB carbonate chemistry and macronutrient measurements to investigate the biogeochemical seasonality in this temperate, seasonally stratified system. Following the onset of stratification, near-surface biological primary production during spring and summer removed dissolved inorganic carbon and nutrients, and a fraction of the sinking particulate organic matter was subsequently remineralised beneath the thermocline. Water column inventories of these variables throughout 1.5 seasonal cycles, corrected for air-sea CO2 exchange and sedimentary denitrification and anammox, isolated the combined effect of net community production (NCP) and remineralisation on the inorganic macronutrient inventories. Overall inorganic inventory changes suggested that a significant fraction (>50%) of the annual NCP of around 3 mol-C m–2 yr–1 appeared to be stored within a long-lived organic matter (OM) pool with a lifetime of several months or more. Moreover, transfers into and out of this pool appeared not to be in steady state over the one full seasonal cycle sampled. Accumulation of such a long-lived and potentially C-rich OM pool is suggested to be at least partially responsible for the estimated net air-to-sea CO2 flux of ∼1.3 mol-C m–2 yr–1 at our study site, while providing a mechanism through which a nutrient-conserving continental shelf pump for CO2 could potentially operate in this and other similar regions
0079-6611
Humphreys, Matthew
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Achterberg, Eric P.
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Hopkins, Joanne
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Chowdhury, Mohammed ZH
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Griffiths, Alex
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Hartman, Susan
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Hull, Tom
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Smilenova, A.
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Wihsgott, Juliane
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Woodward, Malcolm
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Moore, Christopher
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Humphreys, Matthew
5edc45a6-2f03-4916-a9f5-4bef28108da7
Achterberg, Eric P.
6c6e8e22-dd19-49f1-ae4a-bdf003508dcb
Hopkins, Joanne
e9814234-cbed-40f9-8e95-812d4b6ffd6a
Chowdhury, Mohammed ZH
1361d503-3b7f-423e-82a4-596d7aaddc6b
Griffiths, Alex
eb050a44-6cee-4cad-80d7-f92bf4f017ea
Hartman, Susan
d49dd579-4f8b-4079-8b39-01b73ccaf140
Hull, Tom
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Smilenova, A.
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Wihsgott, Juliane
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Woodward, Malcolm
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Moore, Christopher
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Humphreys, Matthew, Achterberg, Eric P., Hopkins, Joanne, Chowdhury, Mohammed ZH, Griffiths, Alex, Hartman, Susan, Hull, Tom, Smilenova, A., Wihsgott, Juliane, Woodward, Malcolm and Moore, Christopher (2018) Mechanisms for a nutrient-conserving carbon pump in a seasonally stratified, temperate continental shelf sea. Progress in Oceanography. (doi:10.1016/j.pocean.2018.05.001).

Record type: Article

Abstract

Continental shelf seas may have a significant role in oceanic uptake and storage of carbon dioxide (CO2) from the atmosphere, through a ‘continental shelf pump’ mechanism. The northwest European continental shelf, in particular the Celtic Sea (50°N 8°W), was the target of extensive biogeochemical sampling from March 2014 to September 2015, as part of the UK Shelf Sea Biogeochemistry research programme (UK-SSB). Here, we use the UK-SSB carbonate chemistry and macronutrient measurements to investigate the biogeochemical seasonality in this temperate, seasonally stratified system. Following the onset of stratification, near-surface biological primary production during spring and summer removed dissolved inorganic carbon and nutrients, and a fraction of the sinking particulate organic matter was subsequently remineralised beneath the thermocline. Water column inventories of these variables throughout 1.5 seasonal cycles, corrected for air-sea CO2 exchange and sedimentary denitrification and anammox, isolated the combined effect of net community production (NCP) and remineralisation on the inorganic macronutrient inventories. Overall inorganic inventory changes suggested that a significant fraction (>50%) of the annual NCP of around 3 mol-C m–2 yr–1 appeared to be stored within a long-lived organic matter (OM) pool with a lifetime of several months or more. Moreover, transfers into and out of this pool appeared not to be in steady state over the one full seasonal cycle sampled. Accumulation of such a long-lived and potentially C-rich OM pool is suggested to be at least partially responsible for the estimated net air-to-sea CO2 flux of ∼1.3 mol-C m–2 yr–1 at our study site, while providing a mechanism through which a nutrient-conserving continental shelf pump for CO2 could potentially operate in this and other similar regions

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Humphreys et al. 2018 - Accepted Manuscript
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mechanisms for nutrient - Accepted Manuscript
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Accepted/In Press date: 2 May 2018
e-pub ahead of print date: 7 May 2018

Identifiers

Local EPrints ID: 420731
URI: http://eprints.soton.ac.uk/id/eprint/420731
ISSN: 0079-6611
PURE UUID: b319c0b3-4d57-4934-8776-d38c91217074
ORCID for Christopher Moore: ORCID iD orcid.org/0000-0002-9541-6046

Catalogue record

Date deposited: 14 May 2018 16:30
Last modified: 26 Nov 2021 02:42

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Contributors

Author: Matthew Humphreys
Author: Eric P. Achterberg
Author: Joanne Hopkins
Author: Mohammed ZH Chowdhury
Author: Alex Griffiths
Author: Susan Hartman
Author: Tom Hull
Author: A. Smilenova
Author: Juliane Wihsgott
Author: Malcolm Woodward

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