Auxiliary material for Paper 2007jc004598 "How does ocean biology affect atmospheric pCO2? Theory and Models" Authors: I. Marinov Now at Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, Massachusetts, USA. M. Follows Program in Atmospheres, Oceans, and Climate, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA. A. Gnanadesikan NOAA/Geophysical Fluid Dynamics Laboratory, Princeton, New Jersey, USA. J. L. Sarmiento and R. D. Slater Atmospheric and Oceanic Sciences Program, Princeton University, Princeton, New Jersey, USA. Marinov, I., M. Follows, A. Gnanadesikan, J. L. Sarmiento, and R. D. Slater (2008), How does ocean biology affect atmospheric pCO2? Theory and models, J. Geophys. Res., 113, C07032, doi:10.1029/2007JC004598. Introduction: This supplementary material contains one figure showing the change in surface preformed PO4 due to Southern Ocean nutrient depletion and the change due to global nutrient depletion in three general circulation models (LL, high Kv and windx3). 2007jc004598-fs01.eps, Figure S1. Surface preformed PO$_4^{3-}$ in the control GCMs (top panels). The change in surface preformed PO$_4^{3-}$ due to Southern Ocean nutrient depletion (middle panels) and due to global nutrient depletion (bottom panels). Nutrients shown in all cases for the standard (LL), high $K_v$ and windx3 GCMs. Units are $\mu$mol/kg. Stronger nutrient upwelling from below the thermocline results in less decrease in Southern Ocean surface nutrients in the high $K_v$ and windx3 models compared to the LL model (middle and bottom panels). Note that surface nutrients do not decrease to zero even after global depletion; full global depletion is never achieved in our models.}