The model used, GENIE-M, is an EMIC based on GENIE-1 (http://www.genie.ac.uk) with a few modifications to enhance its use in biogeochemical modeling studies. GENIE-M is comprised of a 3-dimensional circulation model of the world ocean, an energy and moisture balance model of the atmosphere, and a dynamic and thermodynamic model of sea ice. The ocean model is on a 36x36 equal-area horizontal grid with 10¼ increments in longitude and is uniform with the sine of latitude. There are 16 levels in the vertical with two layers in the top 100m. No terrestrial or sedimentary components are included. Biological production occurs within the top 2 layers, and is multi-nutrient-, light-, temperature-, and mixed layer depth-dependent. The model also includes seasonal shortwave radiation and thus realistic seasonal sea ice formation. For a complete description, see Matsumoto et al., 2008. K. Matsumoto, K. S. Tokos, A. Price, and S. Cox, GENIE-M: a new and improved GENIE-1 developed in Minnesota, Geosci. Model Dev. Discuss., 1, 1-37, 2008