首页|Sea ice contribution to the air–sea CO_2 exchange in the Arctic and Southern Oceans

Sea ice contribution to the air–sea CO_2 exchange in the Arctic and Southern Oceans

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  • NSTL
  • Taylor & Francis
Although salt rejection from sea ice is a key process in deep-water formation in ice-covered seas, the concurrent rejection of CO_2 and the subsequent effect on air–sea CO_2 exchange have received little attention. We review the mechanisms by which sea ice directly and indirectly controls the air–sea CO_2 exchange and use recent measurements of inorganic carbon compounds in bulk sea ice to estimate that oceanic CO_2 uptake during the seasonal cycle of sea-ice growth and decay in ice-covered oceanic regions equals almost half of the net atmospheric CO_2 uptake in ice-free polar seas. This sea-ice driven CO_2 uptake has not been considered so far in estimates of global oceanic CO_2 uptake. Net CO_2 uptake in sea-ice–covered oceans can be driven by; (1) rejection during sea–ice formation and sinking of CO_2-rich brine into intermediate and abyssal oceanic water masses, (2) blocking of air–sea CO_2 exchange during winter, and (3) release of CO_2-depleted melt water with excess total alkalinity during sea-ice decay and (4) biological CO_2 drawdown during primary production in sea ice and surface oceanic waters.

Oceansformationmechanisms

SOREN RYSGAARD、JORGEN BENDTSEN、BRUNO DELILLE、GERHARD S. DIECKMANN、RONNIE N. GLUD、HILARY KENNEDY、JOHN MORTENSEN、STATHYS PAPADIMITRIOU、DAVID N. THOMAS、JEAN-LOUIS TISON

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1Greenland Climate Research Centre, Greenland Institute of Natural Resources, Kivioq 2, 3900 Nuuk, Greenland

Unite d’Oceanographie Chimique, Interfacultary Centre for Marine Research, Universite de Liege, Allee du 6 Aout,17, 4000 Liege, Belgium

Alfred Wegener Institute for Polar and Marine Research, Am Handelshafen 12, 27570 Bremerhaven, Germany

School of Ocean Sciences, Bangor University, Menai Bridge, Anglesey LL59 5AB,Wales, United Kingdom

Glaciology Unit, Department of Earth and Environmental Sciences,Universite Libre de Bruxelles, CP 160/03, 50 Ave. F. D. Roosevelt, 1050 Bruxelles, Belgium

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2011

10.1111/j.1600-0889.2011.00571.x

Tellus

Tellus

ISSN：0280-6509
年,卷(期)：2011.63(5)
  • 60
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