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Links between surface productivity and deep ocean particle flux at the Porcupine Abyssal Plain sustained observatory

Links between surface productivity and deep ocean particle flux at the Porcupine Abyssal Plain sustained observatory
Links between surface productivity and deep ocean particle flux at the Porcupine Abyssal Plain sustained observatory
In this study we present hydrography, biogeochemistry and sediment trap observations between 2003 and 2012 at Porcupine Abyssal Plain (PAP) sustained observatory in the Northeast Atlantic. The time series is valuable as it allows for investigation of the link between surface productivity and deep ocean carbon flux. The region is a perennial sink for CO2, with an average uptake of around 1.5 mmol m?2 day?1. The average monthly drawdowns of inorganic carbon and nitrogen were used to quantify the net community production (NCP) and new production. Seasonal NCP and new production were found to be 4.57 ± 0.85 mol C m?2 and 0.37 ± 0.14 mol N m?2, respectively. The C : N ratio was high (12) compared to the Redfield ratio (6.6), and the production calculated from carbon was higher than production calculated from nitrogen, which is indicative of carbon overconsumption. The export ratio and transfer efficiency were 16 and 4 %, respectively, and the site thereby showed high flux attenuation. Particle tracking was used to examine the source region of material in the sediment trap, and there was large variation in source regions, both between and within years. There were higher correlations between surface productivity and export flux when using the particle-tracking approach, than by comparing with the mean productivity in a 100 km box around the PAP site. However, the differences in correlation coefficients were not significant, and a longer time series is needed to draw conclusions on applying particle tracking in sediment trap analyses.
1726-4170
5885-5897
Frigstad, H.
8b8b82ad-a43f-46ac-acd0-d2528230dff0
Henson, S.A.
d6532e17-a65b-4d7b-9ee3-755ecb565c19
Hartman, S.E.
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Omar, A. M.
51cac434-104b-4d85-80bd-36c0bfc0695c
Jeansson, E.
db4722ce-cff0-4fc6-a086-7e14c71eeaf5
Cole, H.
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Pebody, C.
2aa9ccad-ac79-4ad2-b367-aba3dfc94a53
Lampitt, R.S.
dfc3785c-fc7d-41fa-89ee-d0c6e27503ad
Frigstad, H.
8b8b82ad-a43f-46ac-acd0-d2528230dff0
Henson, S.A.
d6532e17-a65b-4d7b-9ee3-755ecb565c19
Hartman, S.E.
2f74a439-395a-4ee7-89a2-eff4cc8d9481
Omar, A. M.
51cac434-104b-4d85-80bd-36c0bfc0695c
Jeansson, E.
db4722ce-cff0-4fc6-a086-7e14c71eeaf5
Cole, H.
29d57992-20e7-4777-bf3f-8441b6a45140
Pebody, C.
2aa9ccad-ac79-4ad2-b367-aba3dfc94a53
Lampitt, R.S.
dfc3785c-fc7d-41fa-89ee-d0c6e27503ad

Frigstad, H., Henson, S.A., Hartman, S.E., Omar, A. M., Jeansson, E., Cole, H., Pebody, C. and Lampitt, R.S. (2015) Links between surface productivity and deep ocean particle flux at the Porcupine Abyssal Plain sustained observatory. Biogeosciences, 12 (19), 5885-5897. (doi:10.5194/bg-12-5885-2015).

Record type: Article

Abstract

In this study we present hydrography, biogeochemistry and sediment trap observations between 2003 and 2012 at Porcupine Abyssal Plain (PAP) sustained observatory in the Northeast Atlantic. The time series is valuable as it allows for investigation of the link between surface productivity and deep ocean carbon flux. The region is a perennial sink for CO2, with an average uptake of around 1.5 mmol m?2 day?1. The average monthly drawdowns of inorganic carbon and nitrogen were used to quantify the net community production (NCP) and new production. Seasonal NCP and new production were found to be 4.57 ± 0.85 mol C m?2 and 0.37 ± 0.14 mol N m?2, respectively. The C : N ratio was high (12) compared to the Redfield ratio (6.6), and the production calculated from carbon was higher than production calculated from nitrogen, which is indicative of carbon overconsumption. The export ratio and transfer efficiency were 16 and 4 %, respectively, and the site thereby showed high flux attenuation. Particle tracking was used to examine the source region of material in the sediment trap, and there was large variation in source regions, both between and within years. There were higher correlations between surface productivity and export flux when using the particle-tracking approach, than by comparing with the mean productivity in a 100 km box around the PAP site. However, the differences in correlation coefficients were not significant, and a longer time series is needed to draw conclusions on applying particle tracking in sediment trap analyses.

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Published date: 15 October 2015
Organisations: Ocean and Earth Science, Marine Biogeochemistry

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Local EPrints ID: 383593
URI: http://eprints.soton.ac.uk/id/eprint/383593
ISSN: 1726-4170
PURE UUID: c2fb9230-2f55-436f-8941-867326681a19

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Date deposited: 04 Nov 2015 15:26
Last modified: 26 Apr 2022 18:41

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Contributors

Author: H. Frigstad
Author: S.A. Henson
Author: S.E. Hartman
Author: A. M. Omar
Author: E. Jeansson
Author: H. Cole
Author: C. Pebody
Author: R.S. Lampitt

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