The Ministry of the Environment, Japan (MOEJ), National Institute for Environmental Studies (NIES), and Japan Aerospace Exploration Agency (JAXA) have been monitoring carbon dioxide (CO2) and methane (CH4) by the Greenhouse gases Observing SATellite "IBUKI" (GOSAT). A recent analysis of GOSAT observational data up to May 2016 shows that the whole-atmosphere monthly mean CO2 concentration detrended with average seasonal variation (CO2 trend) exceeded 400 ppm in February 2016 for the first time since GOSAT was launched in 2009. Further, whole-atmosphere monthly mean CO2, which first exceeded 400 ppm in December 2015, reached a record- high of 402.3 ppm in May 2016.
This result will be reported at a side event of the 22nd Conference of the Parties (COP 22) to the United Nations Framework Convention on Climate Change (UNFCCC) scheduled to take place in Marrakech, Morocco, from November 7-18, 2016.
The whole-atmosphere monthly mean CO2 concentrations based on GOSAT observation will continue to be reported periodically.
Full text here (PDF)
Whole-atmosphere mean CO2
