Article (Scientific journals)
Sea ice CO2 dynamics across seasons: impact of processes at the interfaces
Van der Linden, Fanny; Tison, Jean-Louis; Champenois, Willy et al.
2020In Journal of Geophysical Research. Oceans
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Abstract :
[en] 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. The pCO2 decrease across the season was driven by physical processes, mainly independent of the autotrophic and heterotrophic phases encountered in the ice interior. 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.
Research center :
FOCUS - Freshwater and OCeanic science Unit of reSearch - ULiège
Disciplines :
Earth sciences & physical geography
Author, co-author :
Van der Linden, Fanny ;  Université de Liège - ULiège > FOCUS
Tison, Jean-Louis
Champenois, Willy ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Chemical Oceanography Unit (COU)
Moreau, Sebastien
Carnat, Gauthier
Kotovitch, Marie
Fripiat, François ;  Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Département de Biologie, Ecologie et Evolution
Deman, Florian ;  Université de Liège - ULiège > FOCUS
Roukaerts, Arnout
Dehairs, Frank
Wauthy, Sarah
Lourenço, Antonio
Vivier, Frederic
Haskell, Tim
Delille, Bruno  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)
More authors (5 more) Less
Language :
English
Title :
Sea ice CO2 dynamics across seasons: impact of processes at the interfaces
Publication date :
13 May 2020
Journal title :
Journal of Geophysical Research. Oceans
ISSN :
2169-9275
eISSN :
2169-9291
Publisher :
Wiley, Hoboken, United States - New Jersey
Peer reviewed :
Peer Reviewed verified by ORBi
Name of the research project :
YROSIAE
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
BELSPO - SPP Politique scientifique - Service Public Fédéral de Programmation Politique scientifique
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