Sea ice pCO2 dynamics and air–ice CO2 fluxes during the Sea Ice Mass Balance in the Antarctic (SIMBA) experiment – Bellingshausen Sea, Antarctica

peer reviewed Temporal evolution of pCO2 profiles in sea ice in the Bellingshausen Sea, Antarctica, in October 2007 shows physical and thermodynamic processes controls theCO2 sys- tem in the ice. During the survey, cyclical warming and cool- ing strongly influenced the physical, chemical, and thermo...

Full description

Bibliographic Details
Published in:The Cryosphere
Main Authors: Geilfus, N.-X., Tison, Jean-Louis, Ackley, S. F., Galley, R. J., Rysgaard, S., Miller, L. A., Delille, Bruno
Format: Article in Journal/Newspaper
Language:English
Published: Copernicus GmbH 2014
Subjects:
Physical
chemical
mathematical & earth Sciences
Earth sciences & physical geography
Physique
chimie
mathématiques & sciences de la terre
Sciences de la terre & géographie physique
Antarc*
Antarctic
Antarctica
Bellingshausen Sea
Sea ice
The Cryosphere
Online Access:https://orbi.uliege.be/handle/2268/176906
https://orbi.uliege.be/bitstream/2268/176906/1/Geilfus%20et%20al.%202014.pdf
https://doi.org/10.5194/tc-8-2395-2014
Description
Summary:peer reviewed Temporal evolution of pCO2 profiles in sea ice in the Bellingshausen Sea, Antarctica, in October 2007 shows physical and thermodynamic processes controls theCO2 sys- tem in the ice. During the survey, cyclical warming and cool- ing strongly influenced the physical, chemical, and thermo- dynamic 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 sec- ond 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 in- crease/decrease in the brine salinity, total alkalinity (TA), to- tal 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 influ- ences the sea ice carbonate system by modulating the temper- ature and therefore the salinity of the sea ice cover. Results indicate that pCO2 was undersaturated with respect to the at- mosphere 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 2.9mmolm−2 d−1), despite supersaturation of the underlying seawater (up to 462 µatm) Bigsouth

Similar Items