The Global Atmosphere Watch (GAW) programme of the World Meteorological Organization (WMO) promotes systematic and reliable observations of the global atmospheric environment.
The Environment Division of WMO’s Atmospheric Research and Environment Programme recently published the 2005 Greenhouse Gas Bulletin with the latest trends and atmospheric burdens of the ost influential, long-lived greenhouse gases; carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O), as well as a summary of the contributions of the lesser gases.
Executive summary:
The latest analysis of data from the WMO-GAW Global Greenhouse Gas Monitoring Network shows that the globally averaged mixing ratios of carbon dioxide (CO2) and nitrous oxide (N2O) have reached new highs in 2005 with CO2 at 379.1 ppm and N2O at 319.2 ppb.
The mixing ratio of methane (CH4 ) remains unchanged at 1783 ppb. These values are higher than those in pre-industrial times by 35.4%, 18.2% and 154.7%, respectively.
Atmospheric growth rates in 2005 of these gases are consistent with recent years. Methane growth has slowed during the past decade. The recently introduced NOAA Annual Greenhouse Gas Index (AGGI) shows that from 1990 to 2005 the atmospheric radiative forcing by all long-lived greenhouse gases has increased by 21.5%.
Full bulletin 2005, 2004, List of data contributers, Press Release (doc) En, Fr
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