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| Titel |
The role of alkalinity generation in controlling the fluxes of CO2 during exposure and inundation on tidal flats |
| VerfasserIn |
P. A. Faber, A. J. Kessler, J. K. Bull, I. D. McKelvie, F. J. R. Meysman, P. L. M. Cook |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 9, no. 10 ; Nr. 9, no. 10 (2012-10-23), S.4087-4097 |
| Datensatznummer |
250007340
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| Publikation (Nr.) |
 copernicus.org/bg-9-4087-2012.pdf |
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| Zusammenfassung |
| Dissolved inorganic carbon (DIC), gaseous CO2 and alkalinity fluxes
from intertidal sediments were investigated during periods of exposure and
inundation, using laboratory core incubations, previously published field
data and reactive transport model simulations. In the incubations and
previous field data, it was found that during periods of alkalinity
production (attributed to the accumulation of reduced sulfur species within
the sediment), the flux of DIC out of the sediment was greater during
inundation than the gaseous CO2 flux during exposure by a factor of up
to 1.8. This finding was supported by computational simulations
which indicated that large amounts of sulfate reduction and reduced sulfur
burial (FeS) induce an alkalinity flux from the sediment during high tide
conditions. Model simulations also found that the amount of reactive Fe in
the sediment was a major driver of net alkalinity production. Our finding
that CO2 fluxes can be significantly lower than total metabolism during
exposure has implications for how total metabolism is quantified on tidal
flats. |
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