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Published March 30, 2001 | public
Journal Article

Biospheric Primary Production During an ENSO Transition


The Sea-viewing Wide Field-of-view Sensor (SeaWiFS) provides global monthly measurements of both oceanic phytoplankton chlorophyll biomass and light harvesting by land plants. These measurements allowed the comparison of simultaneous ocean and land net primary production (NPP) responses to a major El Niño to La Niña transition. Between September 1997 and August 2000, biospheric NPP varied by 6 petagrams of carbon per year (from 111 to 117 petagrams of carbon per year). Increases in ocean NPP were pronounced in tropical regions where El Niño–Southern Oscillation (ENSO) impacts on upwelling and nutrient availability were greatest. Globally, land NPP did not exhibit a clear ENSO response, although regional changes were substantial.

Additional Information

© 2001 American Association for the Advancement of Science. 21 August 2000; accepted 12 February 2001. We thank members of the SeaWiFS Project Office and Orbimage Orbview-2 support staff for their diligent efforts in assuring the success of the SeaWiFS mission, NASA Headquarters for supporting the SeaWiFS project, B. Limketkai for technical assistance, and E. Stanley.

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