Estimates of anthropogenic carbon uptake from four three-dimensional global ocean models

James C. Orr, Ernst Maier-Reimer, Uwe Mikolajewicz, Patrick Monfray, Jorge Louis Sarmiento, J. R. Toggweiler, Nicholas K. Taylor, Jonathan Palmer, Nicolas Gruber, Christopher L. Sabine, Corinne Le Quéré, Robert M. Key, Jacqueline Boutin