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Global and Regional Net Primary Productivity (NPP) 04/01/1998 - 11/22/2009
*Datasource:* Regional and Global Data *Project:* n/a
Net Primary Productivity (NPP) products represent repeatable estimates of the net flux of carbon between the atmosphere and terrestrial vegetation. It quantifies these carbon fluxes by combining a simplified carbon exchange model with satellite observations using SPOT-VEGETATION S10 (SPOT VGT S10) images. The key element in this approach, is that the evolution of the amount and state of the vegetation are directly inferred from space observations, and hence no longer need to be estimated by the carbon budget model itself. This NPP model is based on the Monteith-approach and requires three type...
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Estimates of Net Primary Production (NPP) for the Northeastern United States (from PnET Ecosystem Model) 01/01/1990 - 01/01/2000
*Datasource:* Regional and Global Data *Project:* nasa earth science information partners program (nasa/esip)
The PnET-2 model of forest carbon and water balances was used to estimate regional forest productivity and runoff for the northeastern United States. The model was run at 30 arc-second resolution (approximately 1 km) in conjunction with a Geographic Information System that contained monthly climate data and a satellite-derived land cover map. Predicted net primary production (NPP) ranged from 700 to 1450 g m-2 yr-1 with a regional mean of 1084 g m-2 yr-1. Validation at a number of locations within the region showed close agreement between predicted and observed values. Disagreement at two site...
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Estimates of Water Yield in the Northeastern United States (from PnET Ecosystem Model) 01/01/1990 - 01/01/2000
*Datasource:* Regional and Global Data *Project:* nasa earth science information partners program (nasa/esip)
The PnET-II model of forest carbon and water balances was used to estimate regional forest productivity and runoff for the northeastern United States. The model was run at 30 arc-second resolution (approximately 1 km) in conjunction with a Geographic Information System that contained monthly climate data and a satellite-derived land cover map. Predicted net primary production (NPP) ranged from 700 to 1450 g m-2 yr-1 with a regional mean of 1084 g m-2 yr-1. Validation at a number of locations within the region showed close agreement between predicted and observed values. Disagreement at two sit...
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Global Extent of Grasslands 01/01/1983 - 12/31/2000
*Datasource:* Regional and Global Data *Project:* pilot analysis of global ecosystems (page)
The World Resources Institute (WRI) has examined the extent of, and changes in, the world's grassland areas, as defined by a number of leading land cover classification schemes. The results consist of maps and analyses available through WRI's EarthTrends: The Environmental Information Portal and the WRI Pilot Analysis of Global Ecosystems (PAGE): Grassland Ecosystems. The map of Global Extent of Grassland by IGBP Classification shows the world’s grassland areas as characterized in the land cover classification scheme of the International Geosphere-Biosphere Programme (IGBP, 1998) and mo...
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AVHRR Global Production Efficiency Model (GloPEM) 01/01/1981 - 12/31/2000
*Datasource:* Regional and Global Data *Project:* n/a
The Global Production Efficiency Model (GloPEM) generates global maps of Net Primary Production (NPP) as well as maps of the many other global variables. The objective of the research driving development of GloPEM is the ability to use remotely-sensed observations of surface spectral reflectance and thermal emission to model and monitor terrestrial net primary production and gross primary production at the global scale. Global data sets of such variables are being collected by the Oak Ridge DAAC for validation purposes. GloPEM is the first attempt to utilize the production efficiency concept...
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Climate Change Effects on Net Primary Production (NPP) and Water Yield in the Northeastern United States (from PnET Ecosystem Model) 01/01/1990 - 01/01/2000
*Datasource:* Regional and Global Data *Project:* nasa earth science information partners program (nasa/esip)
These data sets were formed from the ratios of two runs of PnET-2, a forest ecosystem model. It represents a grid of pixels in New England and eastern New York at spatial resolution of 60 arc seconds (about 2 kilometers). One model run used ambient levels of CO2, precipitation and temperature, and the other run used modified levels. Rapid and simultaneous changes in temperature, precipitation and the atmospheric concentration of CO2 are predicted to occur over the next century. Simple, well-validated models of ecosystem function are required to predict the effects of these changes. This mod...
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SLAVE Biosphere Model 01/01/1995 - 11/22/2009
*Datasource:* Regional and Global Data *Project:* n/a
The terrestrial carbon cycle model, SLAVE (Scheme for Large Scale Atmospheric Vegetation Exchange), predicts on a 5 degree by 5 degree latitude/longitude resolution grid the global distribution of nine natural ecosystems, incorporates the effects of managed areas (i.e., croplands), and calculates the seasonal cycle of the main biospheric carbon pools and fluxes from climatic variables (Friedlingstein et al., 1992; 1994; 1995). These vegetation classes considered by SLAVE are evergreen tropical forest, seasonal tropical forest, savannah, grassland/scrubland, temperate deciduous forest, conifero...
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NASA AMES Global Emissions Data Sets (GLEMIS) 07/29/2002 - 11/22/2009
*Datasource:* Regional and Global Data *Project:* nasa-casa (carnegie-ames-stanford approach) biosphere model
The NASA-CASA (Carnegie-Ames-Stanford Approach) Biosphere Model, which simulates net primary production (NPP) and soil heterotrophic respiration (Rh) at regional to global scales, was used to produce the NASA AMES Global Emissions Data Sets (GLEMIS) and Amazon Ecology (AME) Mapping Data Sets. GLEMIS data sets include global maps for predicted fluxes of soil nitrogen gases (N2O and NO), methane (CH4), and carbon monoxide (CO), plus predictions of net primary production (NPP) and carbon storage in leaf, wood, root, litter, and surface soil pools. Regional AME data sets have also been produced, ...
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NASA CASA Biosphere Model 12/01/1993 - 11/22/2009
*Datasource:* Regional and Global Data *Project:* nasa-casa project
The NASA-CASA (Carnegie-Ames-Stanford Approach) Biosphere Model simulates net primary production (NPP) and soil heterotrophic respiration (Rh) at regional to global scales. Calculation of monthly terrestrial NPP is based on the concept of light-use efficiency modified by temperature and moisture stress scalars. Soil carbon cycling and Rh flux components of the model are based on a compartmental pool structure, with first-order equations to simulate loss of CO2 from decomposing plant residue and surface soil organic matter (SOM) pools. Model outputs include the response of net CO2 exchange and...
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Atmosphere-Vegetation Interaction Model (AVIM) 01/01/1995 - 11/22/2009
*Datasource:* Regional and Global Data *Project:* n/a
The Atmosphere-Vegetation Interaction Model (AVIM) is a biogeochemical model involving not only land surface physical processes but also eco-physiological processes. The primary model purpose is to construct a physical and eco-physiological process, two-way feedback mechanical model to be incorporated within climate model (at global or regional scale), and to study climate-ecosystem interaction. AVIM is developed based on the feedback mechanism between the plant growth physiological processes and abiotic environment-atmosphere and soil (i.e., the accumulation of the exchange of materials (...
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