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| The North American Carbon Sink from1982-1998 Estimated using MODIS Algorithm Products
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C. Potter, S. Klooster, R. Myneni, V. Genovese, P. Tan, V. Kumar
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The NASA-CASA model was used to estimate net ecosystem production (NEP) for the
period 1982-1998 from vegetation properties derived from the Advanced Very High
Resolution Radiometer and radiative transfer algorithms that were developed for the Moderate Resolution Imaging Spectroradiometer (MODIS). Predicted NEP flux for atmospheric CO2 in the terrestrial biosphere varied between an annual source of -0.9 Pg C per year and a sink of +2.1 Pg C per year. The terrestrial NEP sink for atmospheric CO2 on the North American (NA) continent was fairly consistent at between +0.2 and +0.3 Pg C per year (see figure below), except during relatively cool annual periods when continental NEP fluxes in NA were predicted to total to nearly zero. Areas of highest NEP variability were detected along the extreme northern vegetated zones of Canada and Alaska, the northern Rocky Mountains, the central-western U.S. Great Plains and central farming region, across the southern U.S. and Mexico, and in coastal forest areas of the U.S. and Canada.
Changes of NEP for North America
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