PerspectiveAtmospheric Science

Methane on the Rise—Again

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Science  31 Jan 2014:
Vol. 343, Issue 6170, pp. 493-495
DOI: 10.1126/science.1247828

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  1. Methane ups and downs.

    Globally averaged atmospheric methane concentrations rose quickly before 1992. The rise then slowed and almost stopped between 1999 and 2006, but resumed in 2007. Data from ftp://ftp.cmdl.noaa.gov/ccg/ch4/flask/event/.

    CREDIT: E. J. DLUGOKENCKY
  2. Methane growth rate by latitude.

    Contours of methane growth rate with sine of latitude. Plotting by sine of degree of latitude equally weights the results for surface area with latitude. Data from www.esrl.noaa.gov/gmd/ccgg/mbl/.

    CREDIT: (B) K. MASARIE, NOAA