Le Qu&eacute;r&eacute; C., C. R&ouml;denbeck, E. Buitenhuis, T. Conway, R. Langenfelds, A. Gomez, C. Labuschagne, M. Ramonet, T. Nakazawa, and M. Heimann. (2005). Interannual variability of air-sea CO2 fluxes in the Southern Ocean.