Primary production in the biosphere

Global spatial variation in annual net primary production (NPP), in g Carbonm-2 year-1, calculated from an integrated model of production based on satellite indices of absorbed solar radiation.
Source: map created from data kindly supplied by Chris Field and George Merchant, Department of Global Ecology, Carnegie Institution of Washington. See home page at http://jasper.stanford.edu/globalecology/FLAB/FLAB.HTML, and Field, C.B. et al. 1998. Primary production of the biosphere: integrating terrestrial and oceanic components. Science 281:237-240.