The METOP-IASI tracked global mean methane hit 1800 ppbv at 586 mb during March 12, 2014, 12-24 hrs UTC. The higher concentrations are occurring, not only over the Eurasia and the Arctic, but also beginning to increase over Antarctica, as it begins to lose the sun, and winter sets in. I will comment more on particular areas in another post.
During the last week, global mean methane readings have begun tracking higher than last year on a regular basis.
This reading was achieved almost exactly two weeks earlier this year than last, when the reading was reached on March 26, 2013.