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| Titel |
Sea ice pCO2 dynamics and air-ice CO2 fluxes during the Sea Ice Mass Balance in the Antarctic (SIMBA) experiment – Bellingshausen Sea, Antarctica |
| VerfasserIn |
N.-X. Geilfus, J.-L. Tison, S. F. Ackley, R. J. Galley, S. Rysgaard, L. A. Miller, B. Delille |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1994-0416
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| Digitales Dokument |
URL |
| Erschienen |
In: The Cryosphere ; 8, no. 6 ; Nr. 8, no. 6 (2014-12-20), S.2395-2407 |
| Datensatznummer |
250116396
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| Publikation (Nr.) |
 copernicus.org/tc-8-2395-2014.pdf |
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| Zusammenfassung |
| Temporal evolution of pCO2 profiles in sea ice in the Bellingshausen
Sea, Antarctica, in October 2007 shows physical and thermodynamic processes
controls the CO2 system in the ice. During the survey, cyclical warming
and cooling strongly influenced the physical, chemical, and thermodynamic
properties of the ice cover. Two sampling sites with contrasting
characteristics of ice and snow thickness were sampled: one had little snow
accumulation (from 8 to 25 cm) and larger temperature and salinity
variations than the second site, where the snow cover was up to 38 cm thick
and therefore better insulated the underlying sea ice. We show that each
cooling/warming event was associated with an increase/decrease in the brine
salinity, total alkalinity (TA), total dissolved inorganic carbon
(TCO2), and in situ brine and bulk ice CO2 partial pressures (pCO2).
Thicker snow covers reduced the amplitude of these changes: snow cover
influences the sea ice carbonate system by modulating the temperature and
therefore the salinity of the sea ice cover. Results indicate that
pCO2 was undersaturated with respect to the atmosphere both in the in situ bulk
ice (from 10 to 193 μatm) and brine (from 65 to 293 μatm),
causing the sea ice to act as a sink for atmospheric CO2 (up to
2.9 mmol m−2 d−1), despite supersaturation of the underlying seawater
(up to 462 μatm). |
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