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Abstract
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.
Highlights
Powered by the California Digital Library University of California cause the area of the Antarctic “ozone hole” to spread beyond those measured in the 1990s
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 Nino to La Nina transition
Variations in NPP for the Carnegie-Ames-Stanford Approach (CASA)-Vertically Generalized Production Model (VGPM) model arise from changes in three factors: (i) incident photosynthetically active radiation (PAR), (ii) the fraction of radiation absorbed by plants, and (iii) light use efficiency (ε)
Summary
Title Biospheric primary production during an ENSO transition. Powered by the California Digital Library University of California cause the area of the Antarctic “ozone hole” to spread beyond those measured in the 1990s. The effect of denitrification on ozone recovery in both hemispheres cannot be ignored and must be included quantitatively in assessment models for better predictions of future springtime polar ozone trends
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