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| Titel |
Insights into oxygen transport and net community production in sea ice from oxygen, nitrogen and argon concentrations |
| VerfasserIn |
J. Zhou, B. Delille, F. Brabant, J.-L. Tison |
| 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. 18 ; Nr. 11, no. 18 (2014-09-18), S.5007-5020 |
| Datensatznummer |
250117599
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| Publikation (Nr.) |
 copernicus.org/bg-11-5007-2014.pdf |
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| Zusammenfassung |
| We present and compare the dynamics (i.e., changes in standing stocks,
saturation levels and concentrations) of O2, Ar and N2 in landfast
sea ice, collected in Barrow (Alaska), from February through June 2009. The
comparison suggests that the dynamic of O2 in sea ice strongly depends
on physical processes (gas incorporation and subsequent transport). Since Ar
and N2 are only sensitive to the physical processes in the present
study, we then discuss the use of O2 / Ar and O2 / N2 to
correct for the physical contribution to O2 supersaturations, and to
determine the net community production (NCP). We conclude that O2 / Ar
suits better than O2 / N2, due to the relative abundance of O2,
N2 and Ar, and the lower biases when gas bubble formation and gas
diffusion are maximized. We further estimate NCP in the impermeable layers
during ice growth, which ranged from −6.6 to 3.6 μmol O2 L−1 d−1,
and the concentrations of O2 due to biological activity in the permeable layers
during ice decay (3.8 to 122 μmol O2 L−1).
We finally highlight the key issues to solve for more accurate NCP estimates in the future. |
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