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Biogeosciences An interactive open-access journal of the European Geosciences Union
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Volume 13, issue 7
Biogeosciences, 13, 2077-2092, 2016
https://doi.org/10.5194/bg-13-2077-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue: Low oxygen environments in marine, fresh and estuarine...

Biogeosciences, 13, 2077-2092, 2016
https://doi.org/10.5194/bg-13-2077-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 08 Apr 2016

Research article | 08 Apr 2016

A multiproxy approach to understanding the "enhanced" flux of organic matter through the oxygen-deficient waters of the Arabian Sea

Richard G. Keil et al.
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Armstrong, R. A., Lee, C., Hedges, J. I., Honjo, S., and Wakeham, S. G.: A new, mechanistic model for organic carbon fluxes in the ocean based on the quantitative association of POC with ballast minerals, Deep-Sea Res. Pt. II, 49, 219–236, 2002.
Arnarson, T. S. and Keil, R. G.: Organic-mineral interactions in marine sediments studied using density fractionation and X-ray photoelectron spectroscopy, Org. Geochem., 32, 1401–1415, 2001.
Arnarson, T. S. and Keil, R. G.: Influence of organic-mineral aggregates on microbial degradation of the dinoflagellate Scrippsiella trochoidea, Geochim. Cosmochim. Ac., 69, 2111–2117, 2005.
Arnarson, T. S. and Keil, R. G.: Changes in organic matter-mineral interactions for marine sediments with varying oxygen exposure times, Geochim. Cosmochim. Ac., 71, 3545–3556, 2007.
Azam, F., Steward, G. F., Smith, D. C., and Ducklow, H. W.: Significance of bacteria in carbon fluxes in the Arabian Sea, P. Indian A. S.-Earth, 103, 341–351, 1994.
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Drifting sediment traps were deployed in the oxygen-deficient waters of the Arabian Sea, where the sinking flux is less attenuated than in more oxic waters. Six mechanisms that might explain this "enhanced flux" were evaluated using literature and data. In the upper 500 m, evidence was found supporting an oxygen effect and/or changes in the efficiency of the microbial loop, including the addition of chemoautotrophic carbon to the sinking flux.
Drifting sediment traps were deployed in the oxygen-deficient waters of the Arabian Sea, where...
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