Change in ocean primary production. Primary production distributions for the SeaWiFS era (1997 to mid-2002), the Coastal Zone Color Scanner era (1979 to mid-1986), and the difference. Units are gC m-2 yr-1. White indicates missing data. Credit: Gregg, W.W., M.E. Conkright, P. Ginoux, J.E. O’Reilly, and N.W. Casey, 2003: Ocean primary production and climate: Global decadal changes. Geophys. Res. Lett., 30:15, 1 August 2003.