Mr. Thomas Boden, Director

Tel: +1 423 241 4842

WDC for Atmospheric Trace Gases

Fax: +1 423 574 2232

Carbon Dioxide Information Analysis Center

E-mail: tab@ornl.gov

Oak Ridge National Laboratory

Home Page: http://mercury.ornl.gov/cdiac

U.S.A.

Maintained by: Oak Ridge National Laboratory, managed by Lockheed Martin Energy Systems Inc. for the U.S. Department of Energy. The WDC for Atmospheric Trace Gases, Oakridge is operated by, and collocated with, the Carbon Dioxide Information Analysis Center (CDIAC), sponsored by the U.S. Department of Energy's Environmental Sciences Division.

Summary of Data Held: Varied data on emissions of radiatively active trace gases and their concentrations in the atmosphere, oceans, and the biosphere, including:

• Time series of concentrations of carbon dioxide (CO2), ozone, methane, nitrous oxide, chlorofluorocarbons (CFCs), CFC replacement species, and HCFCs from ice cores and monitoring stations around the world.
• Global, regional and national emissions of carbon dioxide from fossil fuel combustion and cement manufacturing, 1950-1993; decadal carbon dioxide emissions on a 1 degree x 1 degree lat/long global grid, 1950-1990.
• Carbon storage in ecosystems, on a 1/2 x 1/2 degree lat/long global grid.
• Oceanic 14C, partial pressure of CO2, total CO2, and total alkalinity measurements.
• Organic soil carbon and nitrogen profiles.
• Atmospheric and oceanic carbon isotope measurements.
• Historic land-use changes and corresponding carbon emissions.
• Tropospheric and stratospheric optical depth measurements.
• Computer projections of fossil fuel CO2 emissions based on demographic and energy parameters for 1975-2100.

User Services: Open to visitors during normal working hours; advance notification recommended (required for non-US citizens).