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Sea ice CO2 dynamics across seasons: impact of processes at the interfaces
Van der Linden, F.C.; Tison, J.-L.; Champenois, W.; Moreau, S.; Carnat, G.; Kotovitch, M.; Fripiat, F.; Deman, F.; Roukaerts, A.; Dehairs, F.; Wauthy, S.; Lourenço, A.; Vivier, F.; Haskell, T.; Delille, B. (2020). Sea ice CO2 dynamics across seasons: impact of processes at the interfaces. JGR: Oceans 125(6): e2019JC015807. https://hdl.handle.net/10.1029/2019JC015807
In: Journal of Geophysical Research-Oceans. AMER GEOPHYSICAL UNION: Washington. ISSN 2169-9275; e-ISSN 2169-9291, more
Peer reviewed article  

Available in  Authors 

Keyword
    Marine/Coastal
Author keywords
    Antarctica; air-sea ice fluxes; carbon dioxide; sea ice; trophic status; biofilm

Authors  Top 
  • Van der Linden, F.C., more
  • Tison, J.-L., more
  • Champenois, W., more
  • Moreau, S.
  • Carnat, G., more
  • Wauthy, S., more
  • Lourenço, A.
  • Vivier, F.
  • Haskell, T.
  • Delille, B., more

Abstract
    Winter to summer CO2 dynamics within landfast sea ice in McMurdo Sound (Antarctica) were investigated using bulk ice pCO2 measurements, air-snow-ice CO2 fluxes, dissolved inorganic carbon (DIC), total alkalinity (TA), and ikaite saturation state. Our results suggest depth-dependent biotic and abiotic controls that led us to discriminate the ice column in three layers. At the surface, winter pCO2 supersaturation drove CO2 release to the atmosphere while spring-summer pCO2 undersaturation led to CO2 uptake most of the time. CO2 fluxes showed a diel pattern superimposed upon this seasonal pattern which was potentially assigned to either ice skin freeze-thaw cycles or diel changes in net community production. In the ice interior, the pCO2 decrease across the season was driven by physical processes, mainly independent of the autotrophic and heterotrophic phases. Bottom sea ice was characterized by a massive biomass build-up counterintuitively associated with transient heterotrophic activity and nitrate plus nitrite accumulation. This inconsistency is likely related to the formation of a biofilm. This biofilm hosts both autotrophic and heterotrophic activities at the bottom of the ice during spring and may promote calcium carbonate precipitation.

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