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Application of AVHRR vegetation index to study atmosphere-biosphere exchange of CO2: Results from a 3-D tracer transport modelThe 'normalized difference vegetation indices' (NVI) derived from AVHRR radiances are combined with field data of soil respiration and a global map of net primary productivity to prescribe, for the globe, the seasonal exchange of CO2 between the atmosphere and the terrestrial biosphere. The monthly fluxes of CO2 thus obtained are used as inputs to a 3-D tracer transport model which uses winds generated by a 3-D atmospheric general circulation model to advect CO2 as an inert constituent. Analysis of the 3-D model results shows reasonable agreement between the simulated and observed annual cycles of atmospheric CO2 at the locations of the remote monitoring stations. The application is shown of atmospheric CO2 distributions to calibrate the NVI in terms of carbon fluxes. The approach suggests that the NVI may be used to provide quantitative information about long term and global scale variations of photosynthetic activity and of atmospheric CO2 concentrations provided that variations in the atmospheric circulation and in atmospheric composition are known.
Document ID
19930073155
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Fung, Inez Y.
(Lamont-Doherty Geological Observatory Palisades, NY., United States)
Tucker, C. J.
(NASA Goddard Space Flight Center Greenbelt, MD., United States)
Prentice, Katharine C.
(Columbia Univ. New York, NY., United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1985
Publication Information
Publication: NASA. Ames Research Center, First Symposium on Biospheric Research
Subject Category
Environment Pollution
Accession Number
93N70602
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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