Article (Scientific journals)
Southern Ocean CO2 sink: The contribution of the sea ice
Delille, Bruno; Vancoppenolle, M; Geilfus, N.-X. et al.
2014In Journal of Geophysical Research. Oceans, 119, p. 6340–6355
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Abstract :
[en] We report first direct measurements of the partial pressure of CO2 (pCO2) within Antarctic pack sea ice brines and related CO2 fluxes across the air-ice interface. From late winter to summer, brines encased in the ice change from a CO2 large over-saturation, relative to the atmosphere, to a marked under-saturation while the underlying oceanic waters remains slightly oversaturated. The decrease from winter to summer of pCO2 in the brines is driven by dilution with melting ice, dissolution of carbonate minerals crystals and net primary production. As the ice warms, its permeability increases, allowing CO2 transfer at the air-sea ice interface. The sea ice changes from a transient source to a sink for atmospheric CO2. We upscale these observations to the whole Antarctic sea-icesea ice cover using the NEMO-LIM3 large-scale sea ice-ocean, and provide first estimates of spring and summer CO2 uptake from the atmosphere by Antarctic sea ice. Over the spring-summer period, the Antarctic sea-icesea ice cover is a net sink of atmospheric CO2 of 0.029 PgC, about 58% of the estimated annual uptake from the Southern Ocean. Sea ice then contributes significantly to the sink of CO2 of the Southern Ocean.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Delille, Bruno  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Océanographie chimique
Vancoppenolle, M
Geilfus, N.-X.
Tilbrook, B.
Lannuzel, D.
Schoemann, V.
Becquevort, S.
Carnat, G.
Delille, D.
Lancelot, C.
Chou, L.
Dieckmann, G.
Tison, J.-L.
More authors (3 more) Less
Language :
English
Title :
Southern Ocean CO2 sink: The contribution of the sea ice
Publication date :
2014
Journal title :
Journal of Geophysical Research. Oceans
ISSN :
2169-9275
eISSN :
2169-9291
Publisher :
Wiley, Hoboken, United States - New Jersey
Volume :
119
Pages :
6340–6355
Peer reviewed :
Peer Reviewed verified by ORBi
Name of the research project :
Belcanto - Bigsouth
Funders :
BELSPO - SPP Politique scientifique - Service Public Fédéral de Programmation Politique scientifique
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
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