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New NPP: Eastern U.S. Forests

The ORNL DAAC has released a net primary productivity (NPP) data set pertaining to the mortality of woody biomass in eastern U.S. forests.

"NPP Multi-Biome: Production and Mortality for Eastern U.S. Forests, 1962-1996" contains estimates of the annual mean aboveground wood increments for hardwood and softwood forests in 1956 counties of the 28 eastern states. The estimates are based on forest inventory data from the 1960s to the 1990s.

NPP Web Map Server

A Web map server is now available for accessing net primary productivity (NPP) data maintained by the ORNL DAAC.

The map server helps users more readily find NPP data for 61 locations around the world. Users simply "Query" the map and select a site marker. In response, the server provides links to all the NPP data sets associated with that site. Users can view six map layers, zoom in on areas of interest, and query multiple features.

Grassland NPP Estimates Compiled

A compilation of net primary productivity (NPP) estimates for grasslands has come on-line at the ORNL DAAC. Users will find the compilation handy for comparative study and ecosystem modeling.

Gridded NPP Estimates Revised

A revised version of gridded net primary productivity (NPP) estimates is now available from the ORNL DAAC.

Data providers revised the data set entitled "NPP Multi-Biome: Gridded Estimates for Selected Regions Worldwide, 1989-2001" in the course of readying the research for publication. If you obtained this data set before February 8, 2003, you may want to replace your files.

To learn more about the revisions, see our Data Revisions page.

NPP Compilation Available

The ORNL DAAC announces the release of a Net Primary Productivity (NPP) compilation that brings together individual detailed site NPP data from the ORNL DAAC holdings in a form that is especially useful for comparative study and ecosystem modeling.

Parameters for Ecosystem Modeling

The ORNL DAAC announces the release of a data set entitled "Literature-Derived Parameters for the BIOME-BGC Terrestrial Ecosystem Model."

The data set contains documented ecosystem parameters for major natural temperate biomes in the United States. The parameters are based on the input requirements for BIOME-BGC, a biogeochemical process-based model. The data are suitable for statistical analysis and can be used in other ecosystem models.

Vegetation Data Released

The ORNL DAAC announces the release of a data set entitled "Effects of Elevated Carbon Dioxide on Litter Chemistry and Decomposition."

The data set contains the results of both published experiments and unpublished experiments investigating the impacts of increased carbon dioxide on the chemistry (nitrogen and lignin concentrations) of leaf litter and the decomposition of plant tissues. The data are assembled in a format appropriate for statistical meta-analysis of the effects of carbon dioxide.

Southern African Data Release

The ORNL DAAC now offers seven additional data sets prepared for the Southern African Regional Science Initiative ("SAFARI 2000"). The data sets mainly pertain to soils but also include atmospheric and climate data.

Land Validation Data in Mercury

Mercury, a Web-based search system at the ORNL DAAC, provides a window into land validation data from around the world. The data are primarily collected at field sites for comparison with satellite-derived products.

A total of 51 land validation data sets are currently registered in Mercury. The data include land cover, net primary productivity, leaf area index, and fluxes of carbon dioxide, water, and energy, as well as characteristics of the land validation sites. The land validation products are particularly useful for developing, calibrating, and validating ecosystem models.

RGD Data in Mercury

Over 130 data sets related to regional and global biogeochemical dynamics can now be located and acquired through the Mercury metadata search system at the ORNL DAAC. Thirty-five data sets were added in the past 3 months.

A variety of data held by data centers and researchers around the world are available through Mercury, including data related to climate, hydrology, vegetation/land cover, land use, soil characteristics, and gas flux/emissions. Mercury also provides links to Web sites containing models for predicting biogeochemical processes.

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