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Confirming the role of sea-ice brines in carbon sequestration: A cold, dark journey Whereas brine rejection during sea-ice formation is known to contribute to global deepwater formation, evidence for CO2 sequestration in association with that process has been elusive. A number of field expeditions in the Arctic over the last 15 years, including high temporal resolution observations at a cabled observatory in the Canadian Arctic Archipelago, have provided circumstantial evidence that sea-ice brine export injects CO2 into the underlying water. Laboratory studies have confirmed this CO2 export, including more carbon rejection when the ice forms slowly at relatively high temperatures. Our laboratory experiments indicated a potential for brine injection deeper into the water column, when ice is formed more quickly at lower temperatures, but the question remains as to how effective sea-ice brine export is in sequestering CO2 in deep waters and over what time scales.

--

Lisa A. Miller

Centre for Ocean Climate Chemistry Institute of Ocean Sciences

P.O. Box 6000, 9860 West Saanich Road Sidney, British Columbia V8L 4B2 Canada tel: +1 250 363 6673; fax: +1 250 363 6476

email: lisa.miller@dfo-mpo.gc.ca; lmiller17@shaw.ca web:lmiller173.wixsite.com/lisamillerocean

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