Popular Updates

Latest Release

Atmospheric CO₂ concentration records from the SIO sites (Mauna Loa, Hawaii; Barrow, Alaska; Cape Matatula, Samoa; and the South Pole) updated through 1998 (http://cdiac.ornl.gov/trends/co2/sio-keel.html).

ALE/GAGE/AGAGE
(May 1999) (http://cdiac.ornl.gov/ndps/alegage.html)

Prinn, R., D. Cunnold, P. Fraser, R. Weiss, P. Simmonds, F. Alyea, L. P. Steele, D. Hartley and R. H. J. Wang

Prepared by Tom Boden, CDIAC

CDIAC released an updated database from the global ALE/GAGE/AGAGE monitoring network (DB1001), which provides continuous high-frequency gas chromatographic measurements of eight important biogenic/anthropogenic gases, including methane (CH₄); nitrous oxide (N₂O); the chlorofluorocarbons CFCl₃, CF₂Cl₂, and CF₂ClCFCl₂; methyl chloroform (CH₃CCl₃); chloroform (CHCl₃); and carbon tetrachloride (CCl₄). This database supports analyses and monitoring related to both greenhouse gases and the Earth's ozone layer and also captures the increased growth in CH₄ and N₂O seen in 1998. This database provides data from 1978 when the program began and includes data through September 1998. Data are available for the following sites: Cape Grim, Tasmania; Point Matatula, American Samoa; Ragged Point, Barbados; Mace Head, Ireland; and Trinidad Head, California (stations also previously existed at Cape Meares, Oregon, and Adrigole, Ireland). WDC-A database

Global, Regional, and National CO₂ Emission Estimates from Fossil Fuel Burning, Cement Production, and Gas Flaring: 1751-1996
(March 1999) (NDP-030) (http://cdiac.ornl.gov/ndps/ndp030.html)

Marland, G., T. Boden, and A. Brenkert, CDIAC; B. Andres, University of Alaska-Fairbanks; and C. Johnston, University of Tennessee-Knoxville

CDIAC's database of emissions on carbon dioxide from fossil-fuel combustion and cement production has recently been updated. This data-base provides quantitative estimates of annual CO₂ emissions from fossil-fuel combustion and cement production through 1996, with global total emissions for each year and some national estimates beginning in 1751. Since 1751 over 265 billion tons of carbon have been released to the atmosphere from the consumption of fossil fuels and cement production. The 1996 estimate for global CO₂ emissions, 6518 million metric tons of carbon, is the highest fossil-fuel emission estimate ever. The 1996 estimate represents a 1.7% increase over 1995, continuing a trend of modest growth since a 1990-1993 decline in global CO₂ emissions. WDC-A database

kng 09/99