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| Titel |
Fluxes of carbon and nutrients to the Iceland Sea surface layer and inferred primary productivity and stoichiometry |
| VerfasserIn |
E. Jeansson, R. G. J. Bellerby, I. Skjelvan, H. Frigstad, S. R. Olafsdottir, J. Olafsson |
| 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 ; 12, no. 3 ; Nr. 12, no. 3 (2015-02-12), S.875-885 |
| Datensatznummer |
250117812
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| Publikation (Nr.) |
 copernicus.org/bg-12-875-2015.pdf |
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| Zusammenfassung |
| This study evaluates long-term mean fluxes of carbon and nutrients to the
upper 100 m of the Iceland Sea. The study utilises hydro-chemical data from
the Iceland Sea time series station (68.00° N, 12.67° W),
for the years between 1993 and 2006. By comparing data of dissolved inorganic
carbon (DIC) and nutrients in the surface layer (upper 100 m), and a
sub-surface layer (100–200 m), we calculate monthly deficits in the
surface, and use these to deduce the long-term mean surface layer fluxes that
affect the deficits: vertical mixing, horizontal advection, air–sea exchange,
and biological activity. The deficits show a clear seasonality with a minimum
in winter, when the mixed layer is at the deepest, and a maximum in early
autumn, when biological uptake has removed much of the nutrients. The annual
vertical fluxes of DIC and nitrate amounts to 2.9 ± 0.5 and
0.45 ± 0.09 mol m−2 yr−1, respectively, and the annual
air–sea uptake of atmospheric CO2 is
4.4 ± 1.1 mol C m−2 yr−1. The biologically driven
changes in DIC during the year relates to net community production (NCP), and
the net annual NCP corresponds to export production, and is here calculated
as 7.3 ± 1.0 mol C m−2 yr−1. The typical, median
C : N ratio during the period of net community uptake is 9.0, and clearly
higher than the Redfield ratio, but is varying during the season. |
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