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Surface Ocean and Lower Atmosphere Study—Air-Sea interactions and their climatic and environmental impacts
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New Insights into Carbon Export from Sea Ice
P-C4-07
Lisa A. Miller* , Centre for Ocean Climate Chemistry, Institute of Ocean Sciences, Fisheries and Oceans Canada
Daniela Konig, Department of Environmental Systems Science, ETH Zurich
Patrick Duke, Department of Geography, University of Calgary
Brent G.T. Else, Department of Geography, University of Calgary
Akash Sastry, Ocean Networks Canada
Kyle G. Simpson, Centre for Ocean Climate Chemistry, Institute of Ocean Sciences, Fisheries and Oceans Canada
Svein Vagle, Centre for Ocean Climate Chemistry, Institute of Ocean Sciences, Fisheries and Oceans Canada
Presenter Email: lisa.miller@dfo-mpo.gc.ca |
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.
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