AN ESTIMATE OF GLOBAL PRIMARY PRODUCTION IN THE OCEAN FROM SATELLITE RADIOMETER DATA

An estimate of global net primary production in the ocean has been com puted from the monthly mean near-surface chlorophyll fields for 1979-1 986 obtained by the Nimbus 7 CZCS radiometer. Our model required infor mation about the subsurface distribution of chlorophyll, the parameter s of the photosynthesis-light relationship, the sun angle and cloudine ss. The computations were partitioned among 57 biogeochemical province s that were specified from regional oceanography and by examination of the chlorophyll fields. Making different assumptions about the overes timation of chlorophyll by the CZCS in turbid coastal areas, the globa l net primary production from phytoplankton is given as 45-50 Gt C yea r(-1). This may be compared with current published estimates for land plants of 45-68 Gt C year(-1) and for coastal vegetation of 1.9 Gt C y ear(-1).