The University of Southampton
University of Southampton Institutional Repository

Carbon export efficiency and phytoplankton community composition in the Atlantic sector of the Arctic Ocean

Carbon export efficiency and phytoplankton community composition in the Atlantic sector of the Arctic Ocean
Carbon export efficiency and phytoplankton community composition in the Atlantic sector of the Arctic Ocean
Arctic primary production is sensitive to reductions in sea ice cover, and will likely increase into the future. Whether this increased primary production (PP) will translate into increased export of particulate organic carbon (POC) is currently unclear. Here we report on the POC export efficiency during summer 2012 in the Atlantic sector of the Arctic Ocean. We coupled 234-Thorium based estimates of the export flux of POC to onboard incubation based estimates of PP. Export efficiency (defined as the fraction of PP that is exported below 100 m depth: ThE-ratio) showed large variability (0.09?±?0.19 to 1.3?±?0.3). The highest ThE-ratio (1.3?±?0.3) was recorded in a mono-specific bloom of Phaeocystis pouchetii located in the ice edge. Blooming diatom dominated areas also had high ThE-ratios (0.1?±?0.1 to 0.5?±?0.2), while mixed and/or pre-bloom communities showed lower ThE-ratios (0.10?±?0.03 to 0.19?±?0.05). Furthermore, using oxygen saturation, bacterial abundance, bacterial production, and zooplankton oxygen demand, we also investigated spatial variability in the degree to which this sinking material may be remineralised in the upper mesopelagic (< 300 m). Our results suggest that blooming diatoms and P. pouchetii can export a significant fraction of their biomass below the surface layer (100 m) in the open Arctic Ocean. Also, we show evidence that the material sinking from a P. pouchetii bloom may be remineralised (>100m) at a similar rate as the material sinking from diatom blooms in the upper mesopelagic, contrary to previous findings.
Arctic, carbon export, phytoplankton, remineralisation
2169-9275
3896-3912
Le Moigne, Frédéric A.C.
1b829241-e3de-4e3f-9bb7-c9b65bb2cb64
Poulton, Alex J.
14bf64a7-d617-4913-b882-e8495543e717
Henson, Stephanie A.
d6532e17-a65b-4d7b-9ee3-755ecb565c19
Daniels, Chris J.
aec2572b-e302-4f8e-ab7a-86b8bdf1c155
Fragoso, Glaucia M.
406a23cd-79a7-430b-9dc5-9b98676b7f0f
Mitchell, Elaine
9054ff5a-aba9-4305-b9ac-a37bf05c7fb8
Richier, Sophie
0fc0b375-6918-4c06-9d6f-229f6c4046ca
Smith, Helen E.K.
463cda97-d26b-4fa7-a84c-a3956357f480
Russell, Benjamin C.
a6630e2a-c871-40c2-a80f-e230b1d86be8
Tarling, Geraint A.
d7d95281-b939-4f83-8e5c-224949844dcc
Young, Jeremy R.
18d63549-d248-4012-91b1-64382581ef53
Zubkov, Mike
b1dfb3a0-bcff-430c-9031-358a22b50743
Le Moigne, Frédéric A.C.
1b829241-e3de-4e3f-9bb7-c9b65bb2cb64
Poulton, Alex J.
14bf64a7-d617-4913-b882-e8495543e717
Henson, Stephanie A.
d6532e17-a65b-4d7b-9ee3-755ecb565c19
Daniels, Chris J.
aec2572b-e302-4f8e-ab7a-86b8bdf1c155
Fragoso, Glaucia M.
406a23cd-79a7-430b-9dc5-9b98676b7f0f
Mitchell, Elaine
9054ff5a-aba9-4305-b9ac-a37bf05c7fb8
Richier, Sophie
0fc0b375-6918-4c06-9d6f-229f6c4046ca
Smith, Helen E.K.
463cda97-d26b-4fa7-a84c-a3956357f480
Russell, Benjamin C.
a6630e2a-c871-40c2-a80f-e230b1d86be8
Tarling, Geraint A.
d7d95281-b939-4f83-8e5c-224949844dcc
Young, Jeremy R.
18d63549-d248-4012-91b1-64382581ef53
Zubkov, Mike
b1dfb3a0-bcff-430c-9031-358a22b50743

Le Moigne, Frédéric A.C., Poulton, Alex J., Henson, Stephanie A., Daniels, Chris J., Fragoso, Glaucia M., Mitchell, Elaine, Richier, Sophie, Smith, Helen E.K., Russell, Benjamin C., Tarling, Geraint A., Young, Jeremy R. and Zubkov, Mike (2015) Carbon export efficiency and phytoplankton community composition in the Atlantic sector of the Arctic Ocean. Journal of Geophysical Research: Oceans, 120 (6), 3896-3912. (doi:10.1002/2015JC010700).

Record type: Article

Abstract

Arctic primary production is sensitive to reductions in sea ice cover, and will likely increase into the future. Whether this increased primary production (PP) will translate into increased export of particulate organic carbon (POC) is currently unclear. Here we report on the POC export efficiency during summer 2012 in the Atlantic sector of the Arctic Ocean. We coupled 234-Thorium based estimates of the export flux of POC to onboard incubation based estimates of PP. Export efficiency (defined as the fraction of PP that is exported below 100 m depth: ThE-ratio) showed large variability (0.09?±?0.19 to 1.3?±?0.3). The highest ThE-ratio (1.3?±?0.3) was recorded in a mono-specific bloom of Phaeocystis pouchetii located in the ice edge. Blooming diatom dominated areas also had high ThE-ratios (0.1?±?0.1 to 0.5?±?0.2), while mixed and/or pre-bloom communities showed lower ThE-ratios (0.10?±?0.03 to 0.19?±?0.05). Furthermore, using oxygen saturation, bacterial abundance, bacterial production, and zooplankton oxygen demand, we also investigated spatial variability in the degree to which this sinking material may be remineralised in the upper mesopelagic (< 300 m). Our results suggest that blooming diatoms and P. pouchetii can export a significant fraction of their biomass below the surface layer (100 m) in the open Arctic Ocean. Also, we show evidence that the material sinking from a P. pouchetii bloom may be remineralised (>100m) at a similar rate as the material sinking from diatom blooms in the upper mesopelagic, contrary to previous findings.

Text
grl52778.pdf - Version of Record
Available under License Creative Commons Attribution.
Download (955kB)

More information

Accepted/In Press date: April 2015
Published date: June 2015
Keywords: Arctic, carbon export, phytoplankton, remineralisation
Organisations: Ocean and Earth Science, Marine Biogeochemistry

Identifiers

Local EPrints ID: 376625
URI: http://eprints.soton.ac.uk/id/eprint/376625
ISSN: 2169-9275
PURE UUID: 45313662-7fe7-4519-8d01-9b1075568008

Catalogue record

Date deposited: 29 Apr 2015 09:37
Last modified: 08 Jan 2022 12:23

Export record

Altmetrics

Contributors

Author: Frédéric A.C. Le Moigne
Author: Alex J. Poulton
Author: Chris J. Daniels
Author: Glaucia M. Fragoso
Author: Elaine Mitchell
Author: Sophie Richier
Author: Helen E.K. Smith
Author: Benjamin C. Russell
Author: Geraint A. Tarling
Author: Jeremy R. Young
Author: Mike Zubkov

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×