Energy / Climate Change

September 8, 2013


Monthly Average Atmospheric CO2 Concentration in Japan Exceeds 400 ppmv: Japan Meteorological Agency

Keywords: Climate Change Government 

Copyright Japan Meteorological Agency All Rights Reserved.

The Japan Meteorological Agency (JMA) announced on May 21, 2013, that the atmospheric concentration of carbon dioxide (CO2) has been increasing in Japan and that the monthly average concentration exceeded 400 parts per million by volume (ppmv) at all JMA greenhouse gas monitoring stations by April 2013.

JMA has been monitoring CO2 atmospheric concentrations in Ryori, Ofunato, Iwate Prefecture; Minamitorishima Island, Ogasawara, Tokyo Prefecture; and Yonaguni Island, Yaeyama, Okinawa Prefecture. In 2012, the monthly average exceeded 400ppmv for the first time in Ryori.

Annual average figures in 2012 increased to the highest levels since observation began: 397.2ppmv at Ryori, 394.9ppmv at Minamitorishima Island; and 397.0ppmv at Yonaguni Island. Monthly average figures at all three stations in April 2013 reached an all-time high at Minamitorishima Island, Ryori, and Yonaguni Island at 400.5ppmv, 404.8ppmv, and 403.5ppmv, respectively.