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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 (<i>T</i>CO2), 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 <i>p</i>CO2 was undersaturated with respect to the atmosphere both in the in situ bulk ice (from 10 to 193 Î1/4atm) and brine (from 65 to 293 Î1/4atm), causing the sea ice to act as a sink for atmospheric CO2 (up to 2.9 mmol mg'2 dg'1), despite supersaturation of the underlying seawater (up to 462 Î1/4atm).SCOPUS: ar.jinfo:eu-repo/semantics/publishe

the cryosphere

Sea ice &amp;lt;i&amp;gt;p&amp;lt;/i&amp;gt;CO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; dynamics and air–ice CO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; fluxes during the Sea Ice Mass Balance in the Antarctic (SIMBA) experiment – Bellingshausen Sea, Antarctica