An estimate of global primary production in the ocean from satellite radiometer data |
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Authors: | Longhurst, Alan Sathyendranath, Shubha Platt, Trevor Caverhill, Carla |
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Affiliation: | Biological Oceanography Division, Bedford Institute of Oceanography Dartmouth, Nova Scotia, B2Y 4A2, Canada 1Department of Oceanography, Dalhousie University Halifax, Nova Scotia, B3H 4J1, Canada |
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Abstract: | An estimate of global net primary production in the ocean hasbeen computed from the monthly mean near-surface chlorophyllfields for 19791986 obtained by the Nimbus 7 CZCS radiometer.Our model required information about the subsurface distributionof chlorophyll, the parameters of the photosynthesis-light relationship,the sun angle and cloudiness. The computations were partitionedamong 57 biogeochemical provinces that were specified from regionaloceanography and by examination of the chlorophyll fields. Makingdifferent assumptions about the overestimation of chlorophyllby the CZCS in turbid coastal areas, the global net primaryproduction from phytoplankton is given as 4550 Gt C year1.This may be compared with current published estimates for landplants of 4568 Gt C year1 and for coastal vegetationof 1.9 Gt C year1. |
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