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The association between biogenic and inorganic minerals and the amino acid composition of settling particles

The association between biogenic and inorganic minerals and the amino acid composition of settling particles
The association between biogenic and inorganic minerals and the amino acid composition of settling particles
To test the hypothesis that calcium carbonate (rather than opal) carries most organic carbon to the deep sea, total hydrolysable amino acids (THAA) analysis was applied to deep sea (3000 m) sediment trap material from the Northeast Atlantic (PAP Site), a variable but intrinsically carbonate-dominated system. THAA were analyzed in conjunction with total organic carbon, biogenic silica, calcium carbonate, and inferred lithogenic fluxes. The THAA57 based degradation state of organic carbon could not be systematically explained by changes in the flux of different mineral phases which could only account for 16% of the observed variability. In addition amino acid parameters indicative of source organisms indicate diatom cell walls are an important residual component of organic carbon reaching the deep ocean; a finding supported by comparison with data from previous studies of diverse oceanic environments. Finally, during 2001 very high organic carbon fluxes were associated with elevated lithogenic fluxes and low organic matter degradation relative to surrounding years. In accordance with other recent experimental and observational studies the data indicates that under specific export scenarios lithogenic fluxes can act as highly significant mediators of organic carbon transfer to the deep-ocean.
0024-3590
2207-2218
Salter, I.
805cba99-e754-417b-aac1-cee3a259aced
Kemp, A.E.S.
131b479e-c2c4-47ae-abe1-ad968490960e
Lampitt, R.S.
dfc3785c-fc7d-41fa-89ee-d0c6e27503ad
Gledhill, M.
da795c1e-1489-4d40-9df1-fc6bde54382d
Salter, I.
805cba99-e754-417b-aac1-cee3a259aced
Kemp, A.E.S.
131b479e-c2c4-47ae-abe1-ad968490960e
Lampitt, R.S.
dfc3785c-fc7d-41fa-89ee-d0c6e27503ad
Gledhill, M.
da795c1e-1489-4d40-9df1-fc6bde54382d

Salter, I., Kemp, A.E.S., Lampitt, R.S. and Gledhill, M. (2010) The association between biogenic and inorganic minerals and the amino acid composition of settling particles. Limnology and Oceanography, 55 (5), 2207-2218. (doi:10.4319/lo.2010.55.5.2207).

Record type: Article

Abstract

To test the hypothesis that calcium carbonate (rather than opal) carries most organic carbon to the deep sea, total hydrolysable amino acids (THAA) analysis was applied to deep sea (3000 m) sediment trap material from the Northeast Atlantic (PAP Site), a variable but intrinsically carbonate-dominated system. THAA were analyzed in conjunction with total organic carbon, biogenic silica, calcium carbonate, and inferred lithogenic fluxes. The THAA57 based degradation state of organic carbon could not be systematically explained by changes in the flux of different mineral phases which could only account for 16% of the observed variability. In addition amino acid parameters indicative of source organisms indicate diatom cell walls are an important residual component of organic carbon reaching the deep ocean; a finding supported by comparison with data from previous studies of diverse oceanic environments. Finally, during 2001 very high organic carbon fluxes were associated with elevated lithogenic fluxes and low organic matter degradation relative to surrounding years. In accordance with other recent experimental and observational studies the data indicates that under specific export scenarios lithogenic fluxes can act as highly significant mediators of organic carbon transfer to the deep-ocean.

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Published date: September 2010
Organisations: Marine Biogeochemistry

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Local EPrints ID: 155993
URI: http://eprints.soton.ac.uk/id/eprint/155993
ISSN: 0024-3590
PURE UUID: 9be9e975-3e7a-4e77-88aa-76e17a95609f

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Date deposited: 01 Jun 2010 08:53
Last modified: 14 Mar 2024 01:41

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Contributors

Author: I. Salter
Author: A.E.S. Kemp
Author: R.S. Lampitt
Author: M. Gledhill

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