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What causes the inverse relationship between primary production and export efficiency in the Southern Ocean?

What causes the inverse relationship between primary production and export efficiency in the Southern Ocean?
What causes the inverse relationship between primary production and export efficiency in the Southern Ocean?
The ocean contributes to regulating atmospheric CO2 levels, partly via variability in the fraction of primary production (PP) which is exported out of the surface layer (i.e. the e-ratio). Southern Ocean studies have found that, contrary to global scale analyses, an inverse relationship exists between e-ratio and PP. This relationship remains unexplained, with potential hypotheses being i) large export of dissolved organic carbon (DOC) in high PP areas, ii) strong surface microbial recycling in high PP regions and/ or iii) grazing mediated export varies inversely with PP. We find that the export of DOC has a limited influence in setting the negative e-ratio/PP relationship. However, we observed that at sites with low PP and high e-ratios, zooplankton mediated export is large and surface microbial abundance low suggesting that both are important drivers of the magnitude of the e-ratio in the Southern Ocean.
carbon export, Primary production, Southern Ocean
0094-8276
4457-4466
Le Moigne, Frederic
f809fb0e-04ac-46fb-aae8-e04326555d7e
Henson, Stephanie A.
d6532e17-a65b-4d7b-9ee3-755ecb565c19
Cavan, Emma
aca6bc0e-f2ba-4378-8be6-4da7e1e9da31
Clément, Georges
2d82e359-2c35-4228-b9bc-8ad119139146
Pabortsava, Katsiaryna
bb9c573c-918c-4bc5-ad41-f85e47a6a580
Achterberg, Eric P.
685ce961-8c45-4503-9f03-50f6561202b9
Ceballos-Romero, Elena
ec65af41-2da6-4713-ad55-fec3f63253a9
Zubkov, Mike
b1dfb3a0-bcff-430c-9031-358a22b50743
Sanders, Richard J.
02c163c1-8f5e-49ad-857c-d28f7da66c65
Le Moigne, Frederic
f809fb0e-04ac-46fb-aae8-e04326555d7e
Henson, Stephanie A.
d6532e17-a65b-4d7b-9ee3-755ecb565c19
Cavan, Emma
aca6bc0e-f2ba-4378-8be6-4da7e1e9da31
Clément, Georges
2d82e359-2c35-4228-b9bc-8ad119139146
Pabortsava, Katsiaryna
bb9c573c-918c-4bc5-ad41-f85e47a6a580
Achterberg, Eric P.
685ce961-8c45-4503-9f03-50f6561202b9
Ceballos-Romero, Elena
ec65af41-2da6-4713-ad55-fec3f63253a9
Zubkov, Mike
b1dfb3a0-bcff-430c-9031-358a22b50743
Sanders, Richard J.
02c163c1-8f5e-49ad-857c-d28f7da66c65

Le Moigne, Frederic, Henson, Stephanie A., Cavan, Emma, Clément, Georges, Pabortsava, Katsiaryna, Achterberg, Eric P., Ceballos-Romero, Elena, Zubkov, Mike and Sanders, Richard J. (2016) What causes the inverse relationship between primary production and export efficiency in the Southern Ocean? Geophysical Research Letters, 43 (9), 4457-4466. (doi:10.1002/2016GL068480).

Record type: Article

Abstract

The ocean contributes to regulating atmospheric CO2 levels, partly via variability in the fraction of primary production (PP) which is exported out of the surface layer (i.e. the e-ratio). Southern Ocean studies have found that, contrary to global scale analyses, an inverse relationship exists between e-ratio and PP. This relationship remains unexplained, with potential hypotheses being i) large export of dissolved organic carbon (DOC) in high PP areas, ii) strong surface microbial recycling in high PP regions and/ or iii) grazing mediated export varies inversely with PP. We find that the export of DOC has a limited influence in setting the negative e-ratio/PP relationship. However, we observed that at sites with low PP and high e-ratios, zooplankton mediated export is large and surface microbial abundance low suggesting that both are important drivers of the magnitude of the e-ratio in the Southern Ocean.

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Accepted/In Press date: 8 April 2016
e-pub ahead of print date: 7 May 2016
Published date: 16 May 2016
Keywords: carbon export, Primary production, Southern Ocean
Organisations: Geochemistry, Marine Biogeochemistry

Identifiers

Local EPrints ID: 390659
URI: http://eprints.soton.ac.uk/id/eprint/390659
ISSN: 0094-8276
PURE UUID: 90ab8681-a734-48ad-9a9c-a54ab44ca61c

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Date deposited: 22 Apr 2016 12:16
Last modified: 08 Jan 2022 07:41

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Contributors

Author: Frederic Le Moigne
Author: Emma Cavan
Author: Georges Clément
Author: Katsiaryna Pabortsava
Author: Elena Ceballos-Romero
Author: Mike Zubkov
Author: Richard J. Sanders

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