Popular Updates

ALE/GAGE/AGAGE (June 1998) (http://cdiac.ess-dive.lbl.gov/ndps/alegage.html)

CDIAC released an updated and revised online 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 has been one of CDIAC's "Top Ten" most-requested products, and it supports analyses and monitoring related to both the Kyoto Protocol (to control global warming caused by elevated atmospheric concentrations of greenhouse gases) and the Montreal Protocol (to protect the Earth's ozone layer). The data were contributed by R. Prinn, D. Cunnold, P. Fraser, R. Weiss, P. Simmonds, F. Alyea, L. P. Steele, and D. Hartley; they were prepared for online distribution by CDIAC's Tom Boden. The program began in 1978, and data through September 1997 are now available for all five existing 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

Atmospheric CO2 Concentrations--Mauna Loa Observatory, Hawaii, 1958-1997 (August 1998) (http://cdiac.ess-dive.lbl.gov/ndps/ndp001.html)

1997 marked the 40th anniversary of the Mauna Loa atmospheric CO2 work being done by Drs. Charles D. Keeling and Tim Whorf, which is funded by DOE and other agencies. With data now extending from 1958-1997, this record represents the longest continuous record of atmospheric CO2 concentrations in the world. Because of the favorable site location, continuous monitoring, and careful selection and scrutiny of the data, the Mauna Loa record is considered to be a precise record and a reliable indicator of the regional trend in the concentrations of atmospheric CO2 in the middle layers of the troposphere and is critical to CO2-related research. The Mauna Loa record shows a 15.2% increase in the mean annual atmospheric CO2 concentration, from 315.83 parts per million by volume (ppmv) of dry air in 1959 to 363.82 ppmv in 1997. WDC-A database

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