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

Le Moigne, Frederic A. C., Henson, Stephanie A., Cavan, Emma, Georges, Clément, 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). pp. 4457-4466. DOI 10.1002/2016GL068480.

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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 that 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.

Document Type: Article
Additional Information: WOS:000378339200046
Keywords: carbon export; primary production; Southern Ocean; RRS James Clark Ross; JR274
Research affiliation: OceanRep > The Future Ocean - Cluster of Excellence
OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-BI Biological Oceanography
OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-CH Chemical Oceanography
Kiel University
Refereed: Yes
DOI etc.: 10.1002/2016GL068480
ISSN: 0094-8276
Related URLs:
Projects: GEOTRACES, SeasFX, Future Ocean
Date Deposited: 20 May 2016 11:39
Last Modified: 19 Dec 2017 12:44
URI: http://eprints.uni-kiel.de/id/eprint/32903

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