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| Titel |
Fluxes of particulate organic carbon in the East China Sea in summer |
| VerfasserIn |
C.-C. Hung, C.-W. Tseng, G.-C. Gong, K.-S. Chen, M.-H. Chen, S.-C. Hsu |
| 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 ; 10, no. 10 ; Nr. 10, no. 10 (2013-10-11), S.6469-6484 |
| Datensatznummer |
250085362
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| Publikation (Nr.) |
 copernicus.org/bg-10-6469-2013.pdf |
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| Zusammenfassung |
| To understand carbon cycling in marginal seas better, particulate organic
carbon (POC) concentrations, POC fluxes and primary production (PP) were
measured in the East China Sea (ECS) in summer 2007. Higher concentrations of
POC were observed in the inner shelf, and lower POC values were found in the
outer shelf. Similar to POC concentrations, elevated uncorrected POC fluxes
(720–7300 mg C m−2 d−1) were found in the inner shelf, and
lower POC fluxes (80–150 mg C m−2 d−1) were in the outer
shelf, respectively. PP values (~ 340–3380 mg C m−2 d−1)
had analogous distribution patterns to POC fluxes, while some of PP values
were significantly lower than POC fluxes, suggesting that contributions of
resuspended particles to POC fluxes need to be appropriately corrected. A
vertical mixing model was used to correct effects of bottom sediment
resuspension, and the lowest and highest corrected POC fluxes were in the
outer shelf (58 ± 33 mg C m−2 d−1) and the inner shelf
(785 ± 438 mg C m−2 d−1), respectively. The corrected POC
fluxes (486 to 785 mg C m−2 d−1) in the inner shelf could be the
minimum value because we could not exactly distinguish the effect of POC flux
from Changjiang influence with turbid waters. The results suggest that
27–93% of the POC flux in the ECS might be from the contribution of
resuspension of bottom sediments rather than from the actual biogenic carbon
sinking flux. While the vertical mixing model is not a perfect model to solve
sediment resuspension because it ignores biological degradation of sinking
particles, Changjiang plume (or terrestrial) inputs and lateral transport,
it makes significant progress in both correcting the resuspension problem
and in assessing a reasonable quantitative estimate of POC flux in a marginal
sea. |
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