Randerson, James T, Hoffman, Forest M, Thornton, Peter E, Mahowald, Natalie M, Lindsay, Keith, Lee, Yen-Huei, Nevison, Cynthia D, Doney, Scott C, Bonan, Gordon, Stockli, Reto, Covey, Curtis, Running, Steven W, and Fung, Inez Y, Systematic assessment of terrestrial biogeochemistry in coupled climate-carbon models: .