Continuing the global CH4 methane average jump, on August 13, 2013 am, 0-12 hr, we hit a new high average of 1811 ppb. A comment at Arctic Sea Ice Forum notes: “Assumed methane emissions for the RCP scenarios; which clearly shows that we are now exceeding the methane emissions assumed for RCP 8.5; which is a very disturbing trend.”

Image source / METOP-2: osdpd.noaa.gov/IASI/html/index.html

Further reading

• RCP Concentration Calculations and Data Final Version, background data, acknowledgements and further info
• Methanetracker.org