Submission to: Global and Planetary Change

Abstract. A simulation model based on satellite observations of monthly vegetation cover was used to estimate monthly carbon fluxes in terrestrial ecosystems from 1982 to 1998. The NASA-CASA model was driven by vegetation properties derived from the Advanced Very High Resolution Radiometer and radia...

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Bibliographic Details
Main Authors: Christopher Potter, Steven Klooster, Ranga Myneni, Vanessa Genovese, Pang-ning Tan, Vipin Kumar
Other Authors: The Pennsylvania State University CiteSeerX Archives
Format: Text
Language:English
Subjects:
Key Words
carbon dioxide
ecosystems
remote sensing
ocean climate
Tundra
Online Access:http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.112.7320
http://www.cs.umn.edu/~kumar/papers/potter_gpc02.pdf
Description
Summary:Abstract. A simulation model based on satellite observations of monthly vegetation cover was used to estimate monthly carbon fluxes in terrestrial ecosystems from 1982 to 1998. The NASA-CASA model was driven by vegetation properties derived from the Advanced Very High Resolution Radiometer and radiative transfer algorithms that were developed for the Moderate Resolution Imaging Spectroradiometer (MODIS). For the terrestrial biosphere, predicted net ecosystem production (NEP) flux for atmospheric CO 2 has varied widely between an annual source of-0.9 Pg C per year and a sink of +2.1 Pg C per year. The southern hemisphere tropical zones (SHT, between 0 o and 30 o S) have a major influence over the predicted global trends in interannual variability of NEP. In contrast, the terrestrial NEP sink for atmospheric CO 2 on the North American (NA) continent has been fairly consistent at between +0.2 and +0.3 Pg C per year, except during relatively cool annual periods when continental NEP fluxes are predicted to total to nearly zero. The predicted NEP sink for atmospheric CO 2 over Eurasia (EA) increased notably in the late 1980s and has been fairly consistent at between +0.3 and +0.55 Pg C per year since 1988. High correlations can be detected between the El Niño-Southern Oscillation (ENSO) and predicted NEP fluxes on the EA continent and for the SHT latitude zones, whereas NEP fluxes for the North American continent as a whole do not correlate strongly with ENSO events over the same time series since 1982. These observations support the hypothesis that regional climate warming has had notable but relatively small-scale impacts on high latitude ecosystem (tundra and boreal) sinks for atmospheric CO 2.

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