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| Titel |
Ocean–atmosphere exchange of organic carbon and CO2 surrounding the Antarctic Peninsula |
| VerfasserIn |
S. Ruíz-Halpern, M. Ll. Calleja, J. Dachs, S. Del Vento, M. Pastor, M. Palmer, S. Agustí  , C. M. Duarte |
| 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 ; 11, no. 10 ; Nr. 11, no. 10 (2014-05-26), S.2755-2770 |
| Datensatznummer |
250117422
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| Publikation (Nr.) |
 copernicus.org/bg-11-2755-2014.pdf |
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| Zusammenfassung |
| Exchangeable organic carbon (OC) dynamics and CO2 fluxes in the
Antarctic Peninsula during austral summer were highly variable, but the region
appeared to be a net sink for OC and nearly in balance for CO2. Surface
exchangeable dissolved organic carbon (EDOC) measurements had a 43 ± 3
(standard error, hereafter SE) μmol C L−1 overall mean and
represented around 66% of surface non-purgeable dissolved organic carbon
(DOC) in Antarctic waters, while the mean concentration of the gaseous
fraction of organic carbon (GOC H–1) was
46 ± 3 SE μmol C L−1. There was a tendency towards
low fugacity of dissolved CO2 (fCO2-w) in waters with high
chlorophyll a (Chl a) content and high fCO2-w in areas with
high krill densities. However, such relationships were not found for EDOC.
The depth profiles of EDOC were also quite variable and occasionally followed
Chl a profiles. The diel cycles of EDOC showed two distinct peaks, in the
middle of the day and the middle of the short austral dark period, concurrent
with solar radiation maxima and krill night migration patterns. However, no
evident diel pattern for GOC H–1 or CO2 was observed. The pool of
exchangeable OC is an important and active compartment of the carbon budget
surrounding the Antarctic Peninsula and adds to previous studies highlighting
its importance in the redistribution of carbon in marine environments. |
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