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Greenhouse Gases

   Temporal and spatial variations in greenhouse gas concentrations need to be elucidated precisely for a deeper understanding of the mechanism of global warming, which will lead to more accurate projections of the phenomenon.
   JMA observes concentrations of carbon dioxide, methane, nitrous oxide, surface ozone, carbon monoxide and halocarbons, and monitors their global trends by analyzing observation data reported from all over the world.

* Carbon monoxide itself is not a greenhouse gas, but affects the concentrations of greenhouse gases.
* Chlorofluorocarbons not only destroy stratospheric ozone but also warm the global atmosphere as greenhouse gases.
* Hydrofluorocarbons do not destroy stratospheric ozone, but are known to cause global atmospheric warming due to their properties as greenhouse gases.


CO2 Carbon Dioxide (CO2) CH4 Methane (CH4)
N2O Nitrous Oxide (N2O) Halocarbons Halocarbons
Ozone Surface Ozone (O3) CO Carbon Monoxide (CO)
CO2 distribution Global CO2 Distribution CO2 distribution Aircraft-based upper-air GHG observation
observation method About the observation method of the greenhouse gas WDCGG World Data Centre for Greenhouse Gases (WDCGG)