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J. S. Kimball, M. Zhao, A. D. McGuire, F. A. Heinsch, J. Clein, M. Calef, W. M. Jolly, S. Kang, S. E. Euskirchen, K. C. McDonald, and S. W. Running

CO 2 in the absence of disturbance. Boreal and arctic NPP is characteristically low compared to temperate forests because of reduced solar radiation, colder temperatures, and shorter growing seasons at higher latitudes. Seasonal cold temperatures, permafrost, and wet soils also inhibit soil decomposition and heterotrophic respiration, and provide an additional, indirect constraint to NPP through soil nutrient (primarily nitrogen, N) limitations to vegetation growth ( Bonan and Van Cleve 1992

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J. S. Kimball, K. C. McDonald, and M. Zhao

Resolution Radiometer (AVHRR) Pathfinder monthly time series observations of photosynthetic leaf area and canopy absorbed solar radiation to assess spatial patterns and annual variability in vegetation structure and productivity for the region. We evaluated the statistical correspondence between these variables and seasonal weather patterns for the domain, and the degree to which the onset of the growing season, inferred from the SSM/I record, determines annual variability in regional vegetation

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