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| Titel |
Tidal and seasonal carbon and nutrient dynamics of the Guadalquivir estuary and the Bay of Cádiz (SW Iberian Peninsula) |
| VerfasserIn |
M. Ribas-Ribas, E. Anfuso, A. Gómez-Parra, J. M. Forja |
| 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. 7 ; Nr. 10, no. 7 (2013-07-04), S.4481-4491 |
| Datensatznummer |
250018325
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| Publikation (Nr.) |
 copernicus.org/bg-10-4481-2013.pdf |
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| Zusammenfassung |
| To study the effects of the physical environment on carbon and nutrient
cycle dynamics on the north-eastern shelf of the Gulf of Cádiz, changes
in currents, tides, salinity, temperature, carbon system parameters (fugacity
of CO2 (fCO2), dissolved organic carbon, dissolved inorganic
carbon (DIC) and pH) and other related parameters(dissolved oxygen, total dissolved
nitrogen (TDN), nutrients and suspended particulate matter) were measured in
transects across the Guadalquivir estuary and Bay of Cádiz mouths. The
main objective of this study is to investigate the influence of these inner
ecosystems on the carbon and nutrient distributions on the adjacent
continental shelf. Three cruises were undertaken in June 2006, November
2006 and February 2007. During the whole study period, Guadalquivir estuary
exported components at a rate of 3 Gmol of SiO2, 4 Gmol of DIN,
3 Gmol of TDN, 31 Gmol of DOC and 604 Gmol of DIC per year. On the other
hand, Bay of Cádiz imported 3 Gmol of SiO2, 1 Gmol of DIN, 2 Gmol of
TDN, 33 Gmol of DOC and 562 Gmol of DIC per year. Diurnal variability of
fCO2 could have a potentially important implication on the estimate of
air–sea CO2 fluxes. Tides influence velocity and transport of carbon and
nutrients: we found statistically significant differences (p < 0.0001, n =
220) between the flood tide (the mean velocity was 4.85 cm s–1) and
the ebb tide (the mean velocity was −5.67 cm s–1). Biological
activity and diurnal changes have also an important role on the carbon and
nutrient dynamics. Seasonal carbon and nutrient variations were found. During
June, both systems were exporting components to the adjacent continental
shelf of the Gulf of Cádiz, whereas in February both systems were
importing. Monthly studies should be undertaken to completely understand this
dynamic system. |
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