The Japan Meteorological Agency (JMA) established a WMO Background Air Pollution Monitoring Network (BAPMoN) station at Ryori in 1976 to start the observation of chemical composition of precipitation and dry deposition. This observation at Ryori is the longest in Japan and contributes to the long-term monitoring of acid rain. Later, as the issue of global warming due to increased greenhouse gases became highlighted globally, JMA started a continous observation of atmospheric CO2 at Ryori in 1987, which became a contribution to the WMO Global Atmosphere Watch (GAW) programme. JMA added the observations of aerosol optical depth in 1988, chlorofluorocarbons (CFC-11, CFC-12 and CFC-113), N2O, CCl4, CH3CCl3, CH4, surface ozone and CO incrementally from 1990.
In 1993, JMA established a GAW Global Station, meeting severe requirements in observational environment, at Minamitorishima, where the observations of CO2, CH4, surface ozone, CO, aerosol optical depth, chemical composition of precipitation and dry deposition are launched in a phased manner. From 1997, the observations of CO2, CH4, surface ozone, CO and aerosol optical depth are gradually supplemented at Yonagunijima. The currently implemented observations of JMA are listed in Table 18.104.22.168.
|Altitude||260 m||8 m||30 m||18 m|
|WMO station number||47513||47991||47912||89532|
|GAW station type||Regional||Global||Regional||Regional|
|Aerosol optical depth||O||O||O||O|
|Aerosol vertical profile||O|